FPCN11 CWTO 181500 AAA
Updated forecasts for Southern Ontario and the National Capital
Region issued by Environment Canada at 11:00 a.m. EDT Friday 18
September 2026 for today and Saturday.
The next scheduled forecast will be issued at 3:30 p.m. EDT.

Huntsville - Baysville.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.

Remainder unchanged.

End
$$$$^^
FPCN11 CWTO 181500
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 11:00 a.m. EDT Friday 18 September 2026 for
today and Saturday.
The next scheduled forecast will be issued at 3:30 p.m. EDT.

City of Toronto.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. UV index 6 or high.
Tonight..Partly cloudy. Becoming clear this evening. Low 11.
Saturday..A mix of sun and cloud. Clearing in the afternoon. Wind
 becoming east 20 km/h in the morning. High 20. UV index 6 or high.

Windsor - Leamington - Essex County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 23. Humidex 26. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy after midnight. 30 percent
 chance of showers before morning. Low 13.
Saturday..Cloudy. 30 percent chance of showers changing to 70 percent
 chance of showers in the morning. High 21. UV index 5 or moderate.

Chatham-Kent - Rondeau Park.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. Humidex 25. UV index 7 or high.
Tonight..Increasing cloudiness this evening. Low 12.
Saturday..Cloudy. 60 percent chance of showers late in the morning
 and in the afternoon. Wind becoming east 20 km/h in the morning.
 High 21. UV index 6 or high.

Sarnia - Petrolia - Western Lambton County.
Today..Mainly sunny. High 20. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy late this evening. Low 11.
Saturday..Mainly cloudy. 60 percent chance of showers late in the
 morning and 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.
 High 21. UV index 7 or high.
Tonight..Increasing cloudiness. Low 11.
Saturday..A mix of sun and cloud. 60 percent chance of showers late
 in the morning and in the afternoon. High 21. UV index 7 or high.

Rodney - Shedden - Western Elgin County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. Humidex 25. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy this evening. Low 11.
Saturday..Mainly cloudy. 60 percent chance of showers late in the
 morning and in the afternoon. Wind becoming east 20 km/h in the
 morning. High 20. UV index 7 or high.

St. Thomas - Aylmer - Eastern Elgin County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 23. Humidex 26. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy this evening. Low 10.
Saturday..Mainly cloudy. 40 percent chance of showers in the
 afternoon. High 20. UV index 7 or high.

Strathroy - Komoka - Western Middlesex County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 21. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy late this evening. Low 11.
Saturday..Mainly cloudy. 60 percent chance of showers late in the
 morning and in the afternoon. High 20. UV index 7 or high.

London - Parkhill - Eastern Middlesex County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. Humidex 25. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy late this evening. Low 10.
Saturday..Mainly cloudy. 40 percent chance of showers in the
 afternoon. High 20. UV index 7 or high.

Simcoe - Delhi - Norfolk.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 23. Humidex 25. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy near midnight. Low 9.
Saturday..Mainly cloudy. 40 percent chance of showers in the
 afternoon. 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..Mainly cloudy. Low 9.
Saturday..A mix of sun and cloud. Becoming cloudy in the afternoon.
 High 19. UV index 7 or high.

Woodstock - Tillsonburg - Oxford County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. UV index 7 or high.
Tonight..Partly cloudy. Becoming cloudy near midnight. Low 9.
Saturday..Mainly cloudy. 40 percent chance of showers in the
 afternoon. High 19. UV index 7 or high.

Brantford - County of Brant.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 22. UV index 7 or high.
Tonight..Partly cloudy. Low 9.
Saturday..A mix of sun and cloud. Becoming cloudy in the afternoon.
 High 19. UV index 7 or high.

Niagara Falls - Welland - Southern Niagara Region.
Today..Sunny. High 22. Humidex 25. UV index 7 or high.
Tonight..Clear. Becoming partly cloudy this evening. Low 10.
Saturday..A mix of sun and cloud. Becoming cloudy late in the
 afternoon. High 19. UV index 7 or high.

St. Catharines - Grimsby - Northern Niagara Region.
Today..Sunny. High 21. UV index 6 or high.
Tonight..A few clouds. Low 10.
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 10.
Saturday..A mix of sun and cloud. Wind becoming northeast 20 km/h
 late in the afternoon. 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 11.
Saturday..A mix of sun and cloud. Wind becoming east 20 km/h in the
 morning. 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..Clearing this evening. Low 8.
Saturday..Mainly cloudy. Clearing late in the morning. High 19. UV
 index 6 or high.

Mississauga - Brampton.
Today..Mainly sunny. High 22. UV index 6 or high.
Tonight..Clearing this evening. Low 11.
Saturday..A mix of sun and cloud. High 19. UV index 6 or high.

Caledon.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 20. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..A mix of sun and cloud. High 19. UV index 6 or high.

Vaughan - Richmond Hill - Markham.
Today..Mainly sunny. High 21. UV index 6 or high.
Tonight..Clear. Low 8.
Saturday..A mix of sun and cloud. High 19. UV index 6 or high.

Newmarket - Georgina - Northern York Region.
Today..Mainly sunny. High 20. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Mainly sunny. High 19. UV index 6 or high.

Pickering - Oshawa - Southern Durham Region.
Today..Sunny. High 21. UV index 6 or high.
Tonight..Clear. Low 7.
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 6.
Saturday..Sunny. High 19. UV index 6 or high.

Goderich - Bluewater - Southern Huron County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 20. UV index 6 or high.
Tonight..Partly cloudy. Low 8.
Saturday..A mix of sun and cloud. 40 percent chance of showers in the
 afternoon. High 21. UV index 6 or high.

Wingham - Blyth - Northern Huron County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 19. UV index 6 or high.
Tonight..Clearing this evening. Low 6.
Saturday..Sunny. Becoming a mix of sun and cloud near noon. High 21.
 UV index 6 or high.

Stratford - Mitchell - Southern Perth County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 21. UV index 6 or high.
Tonight..Increasing cloudiness. Low 7.
Saturday..A mix of sun and cloud. 40 percent chance of showers in the
 afternoon. High 21. UV index 6 or high.

Listowel - Milverton - Northern Perth County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 20. UV index 6 or high.
Tonight..A few clouds. Low 6.
Saturday..Mainly sunny. 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 7.
Saturday..A mix of sun and cloud. 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..A few clouds. Low 7.
Saturday..A mix of sun and cloud. High 20. UV index 6 or high.

Mount Forest - Arthur - Northern Wellington County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 19. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Mainly sunny. High 20. UV index 6 or high.

Orangeville - Grand Valley - Southern Dufferin County.
Today..Mainly sunny. High 19. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. Becoming a mix of sun and cloud in the morning.
 High 20. UV index 6 or high.

Shelburne - Mansfield - Northern Dufferin County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 18. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Mainly sunny. High 20. UV index 6 or high.

Innisfil - New Tecumseth - Angus.
Today..Sunny. High 19. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Mainly sunny. High 20. UV index 6 or high.

Saugeen Shores - Kincardine - Southern Bruce County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 18. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Mainly sunny. High 21. UV index 6 or high.

Bruce Peninsula - Sauble Beach - Tobermory.
Today..Sunny. High 18. UV index 5 or moderate.
Tonight..Clear. Low 6.
Saturday..Sunny. High 21. UV index 6 or high.

Hanover - Dundalk - Southern Grey County.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 18. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 20. UV index 6 or high.

Owen Sound - Blue Mountains - Northern Grey County.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 20. UV index 6 or high.

Barrie - Collingwood - Hillsdale.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Midland - Coldwater - Orr Lake.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.

Orillia - Lagoon City - Washago.
Today..Sunny. 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. High 21. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.

Belleville - Quinte West - Eastern Northumberland County.
Today..Sunny. High 21. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Picton - Sandbanks Park.
Today..Sunny. High 21. UV index 6 or high.
Tonight..Clear. Low 9.
Saturday..Sunny. High 19. UV index 6 or high.

Napanee - Consecon.
Today..Sunny. High 21. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.

Kingston - Odessa - Frontenac Islands.
Today..Sunny. High 20. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 19. UV index 6 or high.

Lindsay - Southern Kawartha Lakes.
Today..Sunny. 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. 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. High 21. 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. High 18. UV index 6 or high.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.

Stirling - Tweed - Madoc.
Today..Sunny. 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. High 20. UV index 6 or high.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 18. UV index 6 or high.

Kaladar - Bannockburn - Bon Echo Park.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Bancroft - Hastings Highlands - Denbigh.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 17. UV index 6 or high.

Gananoque - Mallorytown.
Today..Sunny. High 20. UV index 6 or high.
Tonight..Clear. Low 7.
Saturday..Sunny. High 18. UV index 6 or high.

Brockville - Prescott.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low 6.
Saturday..Sunny. High 18. UV index 6 or high.

Westport - Charleston Lake.
Today..Sunny. High 19. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 18. UV index 6 or high.

Merrickville-Wolford - Kemptville.
Today..Sunny. 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. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 5 or moderate.

Ottawa South - Richmond - Metcalfe.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 5 or moderate.

Gatineau.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 18. UV index 5 or moderate.

Prescott and Russell.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Morrisburg - Long Sault.
Today..Sunny. 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. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 6 or high.

Winchester - Newington.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 6 or high.

Maxville - Alexandria.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Plevna - Sharbot Lake - Western Lanark County.
Today..Sunny. High 18. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Smiths Falls - Perth - Eastern Lanark County.
Today..Sunny. High 19. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 17. UV index 6 or high.

Port Carling - Port Severn.
Today..Sunny. High 18. UV index 6 or high.
Tonight..Clear. Low 6.
Saturday..Sunny. High 19. UV index 6 or high.

Bracebridge - Gravenhurst.
Today..Sunny. High 18. UV index 5 or moderate.
Tonight..Clear. Low plus 4.
Saturday..Sunny. High 19. UV index 6 or high.

Town of Parry Sound - Rosseau - Killbear Park.
Today..Sunny. High 18. UV index 5 or moderate.
Tonight..Clear. Low plus 5.
Saturday..Sunny. High 19. UV index 6 or high.

Huntsville - Baysville.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 19. UV index 6 or high.

Haliburton - Minden - Southern Haliburton County.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 17. UV index 6 or high.

Oxtongue Lake - Fort Irwin - Northern Haliburton County.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 17. UV index 6 or high.

Barry's Bay - Killaloe.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 16. UV index 6 or high.

Renfrew - Arnprior - Calabogie.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 16. UV index 6 or high.

Petawawa - Pembroke - Cobden.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 3 with risk of frost.
Saturday..Sunny. High 16. UV index 6 or high.

Western Algonquin Park - Lake of Two Rivers.
Today..Sunny. High 16. UV index 5 or moderate.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 17. UV index 5 or moderate.

Deep River - Whitney - Eastern Algonquin Park.
Today..Sunny. High 16. UV index 5 or moderate.
Tonight..Clear. Low plus 1 with patchy frost.
Saturday..Sunny. High 17. UV index 5 or moderate.

Bayfield Inlet - Dunchurch.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.

South River - Burk's Falls.
Today..Sunny. High 17. UV index 5 or moderate.
Tonight..Clear. Low plus 2 with patchy frost.
Saturday..Sunny. High 19. UV index 6 or high.

End
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 * Origin: Northern Realms (618:400/23)