FPCN11 CWTO 180900
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 5:00 a.m. EDT Friday 18 September 2026 for
today and Saturday.
The next scheduled forecast will be issued at 11:00 a.m. EDT.

City of Toronto.
Today..Sunny. High 22. UV index 6 or high.
Tonight..Clear. Low 12.
Saturday..A mix of sun and cloud. Clearing in the afternoon. High 20.
 UV index 6 or high.

Windsor - Leamington - Essex County.
Today..Sunny. Increasing cloudiness this afternoon. Wind north
 20 km/h becoming light this afternoon. High 23. Humidex 26. UV
 index 7 or high.
Tonight..Partly cloudy. Becoming cloudy near midnight with 40 percent
 chance of showers overnight. Low 14.
Saturday..Cloudy. 70 percent chance of showers changing to 30 percent
 chance of showers in the afternoon. Wind east 20 km/h becoming light
 in the afternoon. High 21. UV index 5 or moderate.

Chatham-Kent - Rondeau Park.
Today..Sunny. Increasing cloudiness this afternoon. Wind north
 20 km/h becoming light this afternoon. High 22. Humidex 25. UV
 index 7 or high.
Tonight..Becoming cloudy late this evening with 40 percent chance of
 showers overnight. Low 13.
Saturday..Mainly cloudy. 70 percent chance of showers changing to
 30 percent chance of showers in the afternoon. Wind east 20 km/h
 becoming light in the afternoon. High 21. UV index 6 or high.

Sarnia - Petrolia - Western Lambton County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon. Wind
 north 20 km/h becoming light this afternoon. High 20. UV index 7 or
 high.
Tonight..Becoming cloudy late this evening with 40 percent chance of
 showers overnight. Low 13.
Saturday..Mainly cloudy. 70 percent chance of showers changing to
 30 percent chance of showers in the afternoon. Wind east 20 km/h
 becoming light in the afternoon. High 21. UV index 5 or moderate.

Watford - Pinery Park - Eastern Lambton County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon. Wind
 north 20 km/h becoming light this afternoon. High 20. UV index 7 or
 high.
Tonight..Partly cloudy. 40 percent chance of showers overnight.
 Low 13.
Saturday..A mix of sun and cloud. 70 percent chance of showers
 changing to 30 percent chance of showers in the afternoon. Wind east
 20 km/h becoming light in the afternoon. High 21. UV index 7 or
 high.

Rodney - Shedden - Western Elgin County.
Today..Sunny. Increasing cloudiness this afternoon. High 23. Humidex
 26. UV index 7 or high.
Tonight..Mainly cloudy. 40 percent chance of showers overnight.
 Low 13.
Saturday..Mainly cloudy. 70 percent chance of showers changing to
 30 percent chance of showers late in the afternoon. Wind east
 20 km/h becoming light in the afternoon. High 20. UV index 7 or
 high.

St. Thomas - Aylmer - Eastern Elgin County.
Today..Sunny. Increasing cloudiness this afternoon. High 24. Humidex
 27. UV index 7 or high.
Tonight..Mainly cloudy. 40 percent chance of showers overnight.
 Low 12.
Saturday..Mainly cloudy. 70 percent chance of showers changing to
 30 percent chance of showers late in the afternoon. Wind east
 20 km/h becoming light in the afternoon. High 20. UV index 7 or
 high.

Strathroy - Komoka - Western Middlesex County.
Today..Sunny. Increasing cloudiness this afternoon. High 21. UV
 index 7 or high.
Tonight..Becoming cloudy late this evening with 40 percent chance of
 showers overnight. Low 12.
Saturday..Mainly cloudy. 70 percent chance of showers changing to
 30 percent chance of showers late in the afternoon. Wind east
 20 km/h becoming light in the afternoon. High 20. UV index 7 or
 high.

London - Parkhill - Eastern Middlesex County.
Today..Sunny. Increasing cloudiness this afternoon. High 22. Humidex
 25. UV index 7 or high.
Tonight..Mainly cloudy. 40 percent chance of showers overnight.
 Low 12.
Saturday..Mainly cloudy. 70 percent chance of showers changing to
 30 percent chance of showers late in the afternoon. Wind east
 20 km/h becoming light in the afternoon. High 20. UV index 7 or
 high.

Simcoe - Delhi - Norfolk.
Today..Sunny. Increasing cloudiness this afternoon. High 23. Humidex
 26. UV index 7 or high.
Tonight..Mainly cloudy. Low 10.
Saturday..Mainly cloudy with 40 percent chance of showers. High 20.
 UV index 7 or high.

Dunnville - Caledonia - Haldimand.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. Humidex 25. UV index 7 or high.
Tonight..Partly cloudy. Low 11.
Saturday..Mainly cloudy. High 19. UV index 7 or high.

Woodstock - Tillsonburg - Oxford County.
Today..Sunny. Increasing cloudiness this afternoon. High 23. Humidex
 25. UV index 7 or high.
Tonight..Mainly cloudy. Low 11.
Saturday..Mainly cloudy with 40 percent chance of showers. High 19.
 UV index 7 or high.

Brantford - County of Brant.
Today..Sunny. Increasing cloudiness this afternoon. High 22. UV
 index 7 or high.
Tonight..Mainly cloudy. Low 10.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 19. UV index 7 or high.

Niagara Falls - Welland - Southern Niagara Region.
Today..Clearing early this morning. High 22. Humidex 26. UV index 7
 or high.
Tonight..Clear. Becoming partly cloudy this evening. Low 13.
Saturday..A mix of sun and cloud. High 19. UV index 7 or high.

St. Catharines - Grimsby - Northern Niagara Region.
Today..Clearing early this morning. High 20. UV index 6 or high.
Tonight..Partly cloudy. Low 12.
Saturday..A mix of sun and cloud. High 19. UV index 7 or high.

City of Hamilton.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. Humidex 25. UV index 7 or high.
Tonight..Partly cloudy. Low 12.
Saturday..A mix of sun and cloud. High 18. UV index 7 or high.

Burlington - Oakville.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. UV index 6 or high.
Tonight..Partly cloudy. Low 13.
Saturday..A mix of sun and cloud. High 19. UV index 6 or high.

Halton Hills - Milton.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 21. UV index 6 or high.
Tonight..A few clouds. Low 10.
Saturday..Mainly cloudy. Clearing late in the morning. High 19. UV
 index 6 or high.

Mississauga - Brampton.
Today..Sunny. High 22. Humidex 25. UV index 6 or high.
Tonight..A few clouds. Low 11.
Saturday..A mix of sun and cloud. High 19. UV index 6 or high.

Caledon.
Today..Sunny. High 20. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..A mix of sun and cloud. High 19. UV index 6 or high.

Vaughan - Richmond Hill - Markham.
Today..Sunny. High 21. UV index 6 or high.
Tonight..Clear. Low 9.
Saturday..A mix of sun and cloud. Clearing in the afternoon. High 19.
 UV index 6 or high.

Newmarket - Georgina - Northern York Region.
Today..Sunny. High 19. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..Sunny. Becoming a mix of sun and cloud in the morning.
 High 19. UV index 6 or high.

Pickering - Oshawa - Southern Durham Region.
Today..Sunny. High 21. UV index 6 or high.
Tonight..Clear. Low 9.
Saturday..Mainly sunny. High 19. UV index 6 or high.

Uxbridge - Beaverton - Northern Durham Region.
Today..Sunny. High 20. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Mainly sunny. High 19. UV index 6 or high.

Goderich - Bluewater - Southern Huron County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon. Fog
 patches dissipating this morning. High 20. UV index 6 or high.
Tonight..Partly cloudy. 30 percent chance of showers overnight.
 Low 9.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 21. UV index 6 or high.

Wingham - Blyth - Northern Huron County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon. Fog
 patches dissipating this morning. High 19. UV index 6 or high.
Tonight..Partly cloudy. 30 percent chance of showers overnight.
 Low 8.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 21. UV index 6 or high.

Stratford - Mitchell - Southern Perth County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon. Fog
 patches dissipating this morning. High 21. Humidex 25. UV index 6 or
 high.
Tonight..Mainly cloudy. 30 percent chance of showers overnight.
 Low 9.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 21. UV index 6 or high.

Listowel - Milverton - Northern Perth County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon. Fog
 patches dissipating this morning. High 20. UV index 6 or high.
Tonight..Partly cloudy. 30 percent chance of showers overnight.
 Low 8.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 21. UV index 6 or high.

Kitchener - Cambridge - Region of Waterloo.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 21. UV index 6 or high.
Tonight..Partly cloudy. Low 9.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 20. UV index 6 or high.

Guelph - Erin - Southern Wellington County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 21. UV index 6 or high.
Tonight..Partly cloudy. Low 9.
Saturday..A mix of sun and cloud. High 20. UV index 6 or high.

Mount Forest - Arthur - Northern Wellington County.
Today..Sunny. Fog patches dissipating this morning. High 19. UV
 index 6 or high.
Tonight..Partly cloudy. 30 percent chance of showers overnight.
 Low 8.
Saturday..A mix of sun and cloud with 40 percent chance of showers.
 High 20. UV index 6 or high.

Orangeville - Grand Valley - Southern Dufferin County.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..A mix of sun and cloud. High 20. UV index 6 or high.

Shelburne - Mansfield - Northern Dufferin County.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..A mix of sun and cloud. High 20. UV index 6 or high.

Innisfil - New Tecumseth - Angus.
Today..Sunny. High 19. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Mainly sunny. High 20. UV index 6 or high.

Saugeen Shores - Kincardine - Southern Bruce County.
Today..Mainly sunny. Fog patches dissipating this morning. Wind
 northeast 20 km/h gusting to 40 becoming light this afternoon.
 High 18. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..Sunny. Becoming a mix of sun and cloud near noon. High 21.
 UV index 6 or high.

Bruce Peninsula - Sauble Beach - Tobermory.
Today..Sunny. Fog patches dissipating this morning. Wind northeast
 20 km/h gusting to 40 becoming light this afternoon. High 18. UV
 index 5 or moderate.
Tonight..Clear. Low 9.
Saturday..Mainly sunny. High 21. UV index 6 or high.

Hanover - Dundalk - Southern Grey County.
Today..Mainly sunny. Fog patches dissipating this morning. Wind
 northeast 20 km/h gusting to 40 becoming light this afternoon.
 High 18. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..Mainly sunny. High 20. UV index 6 or high.

Owen Sound - Blue Mountains - Northern Grey County.
Today..Sunny. Fog patches dissipating this morning. Wind northeast
 20 km/h gusting to 40 becoming light this afternoon. High 17. UV
 index 6 or high.
Tonight..Clear. Low 8.
Saturday..Sunny. High 20. UV index 6 or high.

Barrie - Collingwood - Hillsdale.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 18. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

Midland - Coldwater - Orr Lake.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 18. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..Sunny. High 19. UV index 6 or high.

Orillia - Lagoon City - Washago.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 18. UV index 5 or moderate.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.

Cobourg - Colborne - Western Northumberland County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low 9.
Saturday..Sunny. High 19. UV index 6 or high.

Belleville - Quinte West - Eastern Northumberland County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

Picton - Sandbanks Park.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 21. UV index 6 or high.
Tonight..Clear. Low 10.
Saturday..Sunny. High 19. UV index 6 or high.

Napanee - Consecon.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 21. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

Kingston - Odessa - Frontenac Islands.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..Sunny. High 19. UV index 6 or high.

Lindsay - Southern Kawartha Lakes.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Fenelon Falls - Balsam Lake Park - Northern Kawartha Lakes.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 18. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Peterborough City - Lakefield - Southern Peterborough County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 19. UV index 6 or high.

Apsley - Woodview - Northern Peterborough County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 18. UV index 6 or high.
Tonight..Clear. Low plus 3.
Saturday..Sunny. High 19. UV index 6 or high.

Stirling - Tweed - Madoc.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 18. UV index 6 or high.

Tamworth - Sydenham - South Frontenac.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 20. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 18. UV index 6 or high.

Kaladar - Bannockburn - Bon Echo Park.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 17. UV index 6 or high.
Tonight..Clear. Low plus 3.
Saturday..Sunny. High 17. UV index 6 or high.

Bancroft - Hastings Highlands - Denbigh.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Gananoque - Mallorytown.
Today..Sunny. Fog patches dissipating early this morning. Wind
 becoming north 20 km/h gusting to 40 this morning. High 20. UV
 index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 18. UV index 6 or high.

Brockville - Prescott.
Today..Sunny. Fog patches dissipating early this morning. Wind
 becoming north 20 km/h gusting to 40 this morning. High 20. UV
 index 5 or moderate.
Tonight..Clear. Low 6.
Saturday..Sunny. High 18. UV index 6 or high.

Westport - Charleston Lake.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning.
 High 20. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 18. UV index 6 or high.

Merrickville-Wolford - Kemptville.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning.
 High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 18. UV index 6 or high.

Ottawa North - Kanata - Orl�ans.
Today..Sunny. Wind becoming northwest 20 km/h gusting to 40 this
 morning. High 19. UV index 5 or moderate.
Tonight..Clear. Low 6.
Saturday..Sunny. High 17. UV index 5 or moderate.

Ottawa South - Richmond - Metcalfe.
Today..Sunny. Wind becoming northwest 20 km/h gusting to 40 this
 morning. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 17. UV index 5 or moderate.

Gatineau.
Today..Sunny. Wind becoming northwest 20 km/h gusting to 40 this
 morning. High 18. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 18. UV index 5 or moderate.

Prescott and Russell.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning.
 High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 6 or high.

Morrisburg - Long Sault.
Today..Sunny. Fog patches dissipating early this morning. Wind
 becoming north 20 km/h gusting to 40 this morning. High 19. UV
 index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 17. UV index 6 or high.

Cornwall - Lancaster.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning.
 High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 17. UV index 6 or high.

Winchester - Newington.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning.
 High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 17. UV index 6 or high.

Maxville - Alexandria.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning.
 High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 6 or high.

Plevna - Sharbot Lake - Western Lanark County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 18. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 6 or high.

Smiths Falls - Perth - Eastern Lanark County.
Today..Sunny. Wind becoming northwest 20 km/h gusting to 40 this
 morning. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 17. UV index 6 or high.

Port Carling - Port Severn.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 18. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

Bracebridge - Gravenhurst.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 18. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Town of Parry Sound - Rosseau - Killbear Park.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 18. UV index 5 or moderate.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

Huntsville - Baysville.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Haliburton - Minden - Southern Haliburton County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 3.
Saturday..Sunny. High 17. UV index 6 or high.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Today..Sunny. Wind becoming north 20 km/h gusting to 40 this morning
 then light this afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Barry's Bay - Killaloe.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 3.
Saturday..Sunny. High 16. UV index 6 or high.

Renfrew - Arnprior - Calabogie.
Today..A mix of sun and cloud. Becoming sunny near noon. Wind north
 20 km/h gusting to 40 becoming light this afternoon. High 17. UV
 index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 16. UV index 6 or high.

Petawawa - Pembroke - Cobden.
Today..Mainly sunny. Wind north 20 km/h gusting to 40 becoming light
 this afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 16. UV index 6 or high.

Western Algonquin Park - Lake of Two Rivers.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 16. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with risk of frost.
Saturday..Sunny. High 17. UV index 5 or moderate.

Deep River - Whitney - Eastern Algonquin Park.
Today..Clearing. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 16. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with risk of frost.
Saturday..Sunny. High 17. UV index 5 or moderate.

Bayfield Inlet - Dunchurch.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

South River - Burk's Falls.
Today..Sunny. Wind north 20 km/h gusting to 40 becoming light this
 afternoon. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

End
$$$$^^

--- up 1 day, 14 hours, 34 minutes
 * Origin: Northern Realms (618:400/23)