FPCN11 CWTO 120900
Forecasts for Southern Ontario and the National Capital Region issued
by Environment Canada at 5:00 a.m. EDT Saturday 12 September 2026 for
today and Sunday.
The next scheduled forecast will be issued at 11:00 a.m. EDT.

City of Toronto.
Today..Sunny. Increasing cloudiness this afternoon. High 26. Humidex
 31. UV index 6 or high.
Tonight..Mainly cloudy with 40 percent chance of showers and risk of
 a thunderstorm. Low 19.
Sunday..A mix of sun and cloud with 40 percent chance of showers
 early in the morning. Clearing in the morning. Wind becoming west
 30 km/h in the morning. High 27. Humidex 32. UV index 6 or high.

Windsor - Essex - Chatham-Kent.
Today..Increasing cloudiness early this morning. 30 percent chance of
 showers late this afternoon with risk of thunderstorms. Wind
 becoming southwest 20 km/h late this morning. High 27. Humidex 35.
 UV index 3 or moderate.
Tonight..Partly cloudy. 30 percent chance of showers this evening
 with risk of thunderstorms. Clearing before morning. Wind southwest
 20 km/h becoming light after midnight. Low 18.
Sunday..Sunny in the morning and early in the afternoon then a mix of
 sun and cloud with 40 percent chance of showers in the afternoon.
 Wind becoming west 20 km/h late in the morning. High 27. Humidex 33.
 UV index 6 or high.

Sarnia - Lambton.
Today..Sunny. Increasing cloudiness this morning then 30 percent
 chance of showers late this afternoon. Risk of thunderstorms late
 this afternoon. Wind becoming south 20 km/h late this morning.
 High 28. Humidex 36. UV index 6 or high.
Tonight..Partly cloudy. 30 percent chance of showers this evening and
 after midnight with risk of thunderstorms. Wind south 20 km/h
 becoming light after midnight. Low 17.
Sunday..A mix of sun and cloud. Wind becoming northwest 20 km/h late
 in the morning. High 24. Humidex 29. UV index 6 or high.

Elgin.
Today..Increasing cloudiness. 30 percent chance of showers late this
 afternoon with risk of thunderstorms. Wind becoming south 20 km/h
 late this morning. High 24 with temperature falling to 21 this
 afternoon. Humidex 30. UV index 4 or moderate.
Tonight..Cloudy with 30 percent chance of showers this evening and
 risk of thunderstorms. Clearing near midnight. Wind south 20 km/h
 becoming light this evening. Temperature steady near 20.
Sunday..Sunny in the morning and early in the afternoon then a mix of
 sun and cloud with 40 percent chance of showers in the afternoon.
 Wind becoming northwest 20 km/h in the afternoon. High 27. Humidex
 32. UV index 6 or high.

London - Middlesex.
Today..Increasing cloudiness. 30 percent chance of showers late this
 afternoon with risk of thunderstorms. Wind becoming south 20 km/h
 this afternoon. High 24. Humidex 32. UV index 7 or high.
Tonight..Mainly cloudy. 30 percent chance of showers this evening and
 after midnight with risk of thunderstorms. Wind south 20 km/h
 becoming light after midnight. Low 18.
Sunday..A mix of sun and cloud. Wind becoming northwest 20 km/h in
 the afternoon. High 24. Humidex 29. UV index 6 or high.

Simcoe - Delhi - Norfolk.
Today..Sunny. Increasing cloudiness this afternoon then 60 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. High 25. Humidex 31. UV index 7 or high.
Tonight..Cloudy with 60 percent chance of showers and risk of a
 thunderstorm. Low 19.
Sunday..A mix of sun and cloud. 60 percent chance of showers early in
 the morning. 30 percent chance of showers late in the afternoon.
 High 27. Humidex 32. UV index 6 or high.

Dunnville - Caledonia - Haldimand.
Today..Sunny. Increasing cloudiness this afternoon then 60 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. Wind becoming southwest 20 km/h late this afternoon.
 High 26. Humidex 33. UV index 7 or high.
Tonight..Cloudy with 60 percent chance of showers and risk of a
 thunderstorm. Wind southwest 20 km/h becoming light this evening.
 Low 21.
Sunday..A mix of sun and cloud. 60 percent chance of showers early in
 the morning. 30 percent chance of showers late in the afternoon.
 Wind becoming northwest 20 km/h in the afternoon. High 28. Humidex
 34. UV index 6 or high.

Oxford - Brant.
Today..Sunny. Increasing cloudiness this afternoon then 30 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. Wind becoming south 20 km/h late this morning.
 High 27. Humidex 33. UV index 7 or high.
Tonight..Cloudy with 40 percent chance of showers and risk of a
 thunderstorm. Wind becoming southwest 20 km/h late this evening.
 Low 18.
Sunday..A mix of sun and cloud. 40 percent chance of showers early in
 the morning. Wind becoming northwest 20 km/h in the afternoon.
 High 26. Humidex 33. UV index 6 or high.

Niagara Falls - Welland - Southern Niagara Region.
Today..Sunny. Increasing cloudiness near noon then 60 percent chance
 of showers late this afternoon. Risk of a thunderstorm late this
 afternoon. Wind becoming southwest 30 km/h late this afternoon.
 High 24. Humidex 31. UV index 7 or high.
Tonight..Cloudy with 60 percent chance of showers and risk of a
 thunderstorm. Wind southwest 30 km/h. Temperature steady near 22.
Sunday..A mix of sun and cloud. 60 percent chance of showers early in
 the morning. 30 percent chance of showers late in the afternoon.
 Wind west 20 km/h. Temperature steady near 23. Humidex 31. UV
 index 6 or high.

St. Catharines - Grimsby - Northern Niagara Region.
Today..Sunny. Increasing cloudiness this afternoon then 60 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. High 28. Humidex 35. UV index 6 or high.
Tonight..Cloudy with 60 percent chance of showers and risk of a
 thunderstorm. Low 21.
Sunday..A mix of sun and cloud. 60 percent chance of showers early in
 the morning. 30 percent chance of showers late in the afternoon.
 Wind becoming northwest 30 km/h late in the morning. High 26.
 Humidex 33. UV index 6 or high.

City of Hamilton.
Today..Sunny. Increasing cloudiness this afternoon then 30 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. Wind becoming southwest 20 km/h late this afternoon.
 High 26. Humidex 33. UV index 7 or high.
Tonight..Cloudy with 40 percent chance of showers and risk of a
 thunderstorm. Wind southwest 20 km/h becoming light this evening.
 Low 20.
Sunday..A mix of sun and cloud with 40 percent chance of showers
 early in the morning. Otherwise sunny. Wind becoming west 20 km/h in
 the afternoon. High 26. Humidex 32. UV index 6 or high.

Halton - Peel.
Today..Sunny early this morning then a mix of sun and cloud with
 30 percent chance of showers late this afternoon. Risk of a
 thunderstorm late this afternoon. High 26. Humidex 31. UV index 6 or
 high.
Tonight..Partly cloudy with 30 percent chance of showers and risk of
 a thunderstorm. Low 19.
Sunday..A mix of sun and cloud. 40 percent chance of showers early in
 the morning. Wind becoming west 30 km/h in the afternoon. High 27.
 Humidex 32. UV index 6 or high.

York - Durham.
Today..Sunny. Increasing cloudiness this afternoon. High 26. Humidex
 31. UV index 6 or high.
Tonight..Cloudy. 40 percent chance of showers before morning. Low 19.
Sunday..Cloudy with 40 percent chance of showers early in the
 morning. Clearing in the morning. Wind becoming northwest 20 km/h in
 the afternoon. High 26. Humidex 30. UV index 6 or high.

Huron - Perth.
Today..Sunny early this morning then a mix of sun and cloud with
 30 percent chance of showers late this afternoon. Risk of a
 thunderstorm late this afternoon. Wind becoming southwest 20 km/h
 late this morning. High 26. Humidex 33. UV index 6 or high.
Tonight..Partly cloudy with 60 percent chance of showers and risk of
 a thunderstorm. Wind south 20 km/h becoming light after midnight.
 Low 16.
Sunday..A mix of sun and cloud. 30 percent chance of showers late in
 the afternoon. Wind becoming northwest 20 km/h in the afternoon.
 High 23. Humidex 28. UV index 5 or moderate.

Waterloo - Wellington.
Today..Mainly sunny. Increasing cloudiness near noon then 30 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. Wind becoming south 20 km/h late this morning.
 High 26. Humidex 31. UV index 7 or high.
Tonight..Mainly cloudy with 30 percent chance of showers and risk of
 a thunderstorm. Wind south 20 km/h becoming light this evening.
 Low 16.
Sunday..A mix of sun and cloud. 40 percent chance of showers early in
 the morning. Wind becoming west 20 km/h in the afternoon. High 23.
 Humidex 26. UV index 6 or high.

Dufferin - Innisfil.
Today..Sunny. Increasing cloudiness this afternoon then 30 percent
 chance of showers late this afternoon. Risk of a thunderstorm late
 this afternoon. High 26. Humidex 31. UV index 6 or high.
Tonight..Partly cloudy with 30 percent chance of showers and risk of
 a thunderstorm. Low 18.
Sunday..A mix of sun and cloud. 40 percent chance of showers early in
 the morning. High 24. Humidex 27. UV index 6 or high.

Saugeen Shores - Kincardine - Southern Bruce County
Bruce Peninsula - Sauble Beach - Tobermory.
Today..A mix of sun and cloud. 30 percent chance of showers late this
 afternoon with risk of a thunderstorm. Wind southeast 20 km/h
 becoming southwest 20 late this morning. High 26. Humidex 33. UV
 index 6 or high.
Tonight..Cloudy with 60 percent chance of showers and risk of a
 thunderstorm. Wind south 30 km/h becoming light after midnight.
 Low 14.
Sunday..Mainly sunny. Increasing cloudiness in the afternoon then
 30 percent chance of showers late in the afternoon. Wind becoming
 west 20 km/h in the morning. High 21. Humidex 25. UV index 5 or
 moderate.

Hanover - Dundalk - Southern Grey County
Owen Sound - Blue Mountains - Northern Grey County.
Today..Sunny early this morning then a mix of sun and cloud with
 30 percent chance of showers late this afternoon. Risk of a
 thunderstorm late this afternoon. Wind becoming southwest 20 km/h
 late this morning. High 26. Humidex 33. UV index 6 or high.
Tonight..Partly cloudy with 60 percent chance of showers and risk of
 a thunderstorm. Wind south 20 km/h becoming light after midnight.
 Low 16.
Sunday..Mainly sunny. Increasing cloudiness in the afternoon then
 30 percent chance of showers late in the afternoon. Wind becoming
 west 20 km/h in the afternoon. High 22. Humidex 25. UV index 5 or
 moderate.

Barrie - Collingwood - Hillsdale
Midland - Coldwater - Orr Lake.
Today..Sunny. Becoming a mix of sun and cloud this morning. Wind
 becoming south 20 km/h late this afternoon. High 25. Humidex 31. UV
 index 6 or high.
Tonight..Partly cloudy. Becoming cloudy after midnight with
 60 percent chance of showers overnight. Risk of a thunderstorm
 overnight. Wind south 20 km/h becoming light this evening. Low 18.
Sunday..Mainly cloudy. 60 percent chance of showers early in the
 morning. Clearing late in the morning. Wind becoming northwest
 30 km/h in the morning. High 22. Humidex 25. UV index 5 or moderate.

Orillia - Lagoon City - Washago.
Today..Mainly sunny. Wind becoming southwest 20 km/h late this
 morning. High 25. Humidex 31. UV index 6 or high.
Tonight..Cloudy. 60 percent chance of showers overnight. Risk of a
 thunderstorm overnight. Wind south 30 km/h. Low 19.
Sunday..A mix of sun and cloud. 60 percent chance of showers early in
 the morning. Wind west 30 km/h. High 21. UV index 5 or moderate.

Belleville - Quinte - Northumberland.
Today..Sunny. Increasing cloudiness late this afternoon. High 26.
 Humidex 33. UV index 6 or high.
Tonight..Cloudy. Showers beginning this evening. Risk of a
 thunderstorm this evening and overnight. Wind becoming southwest
 20 km/h late this evening. Low 20.
Sunday..Showers ending in the morning then a mix of sun and cloud.
 Wind becoming west 20 km/h in the morning. High 25. Humidex 31. UV
 index 5 or moderate.

Kingston - Prince Edward.
Today..Sunny. Increasing cloudiness late this afternoon. Wind
 becoming south 20 km/h late this morning. High 26. Humidex 33. UV
 index 6 or high.
Tonight..Cloudy. Showers beginning this evening. Risk of a
 thunderstorm late this evening and overnight. Wind becoming
 southwest 30 km/h this evening. Low 19.
Sunday..A few showers ending in the afternoon then clearing. Wind
 southwest 30 km/h. High 26. Humidex 35. UV index 4 or moderate.

Peterborough - Kawartha Lakes.
Today..Sunny. Increasing cloudiness late this afternoon. Fog patches
 dissipating this morning. High 26. Humidex 31. UV index 6 or high.
Tonight..Cloudy. 40 percent chance of showers before morning. Low 18.
Sunday..Cloudy with 40 percent chance of showers early in the
 morning. Clearing in the morning. Wind becoming west 30 km/h in the
 afternoon. High 25. Humidex 28. UV index 6 or high.

Stirling - Tweed - South Frontenac.
Today..Sunny. Increasing cloudiness late this afternoon. High 25.
 Humidex 31. UV index 6 or high.
Tonight..Cloudy. Showers beginning this evening. Risk of a
 thunderstorm late this evening and overnight. Low 20.
Sunday..A few showers ending in the afternoon then clearing. High 26.
 Humidex 35. UV index 4 or moderate.

Kaladar - Bannockburn - Bon Echo Park.
Today..Sunny. High 25. Humidex 30. UV index 6 or high.
Tonight..Increasing cloudiness. Showers beginning this evening. Risk
 of a thunderstorm this evening and overnight. Low 19.
Sunday..Showers ending in the morning then clearing. High 25. Humidex
 32. UV index 4 or moderate.

Bancroft - Hastings Highlands - Denbigh.
Today..Mainly sunny. High 25. Humidex 30. UV index 6 or high.
Tonight..Increasing cloudiness. A few showers beginning late this
 evening. Risk of a thunderstorm late this evening and overnight.
 Low 17.
Sunday..A few showers ending in the morning then clearing. High 24.
 Humidex 26. UV index 5 or moderate.

Gananoque - Mallorytown
Brockville - Prescott
Westport - Charleston Lake.
Today..Sunny. High 25. Humidex 30. UV index 6 or high.
Tonight..Increasing cloudiness. Showers beginning this evening. Risk
 of a thunderstorm late this evening and overnight. Wind becoming
 southwest 20 km/h late this evening. Low 20.
Sunday..A few showers ending in the afternoon then clearing. High 26.
 Humidex 35. UV index 4 or moderate.

Merrickville-Wolford - Kemptville.
Today..Sunny. High 26. Humidex 31. UV index 6 or high.
Tonight..Increasing cloudiness. Showers beginning this evening. Risk
 of a thunderstorm late this evening and overnight. Low 18.
Sunday..A few showers ending in the afternoon then clearing. High 24.
 Humidex 31. UV index 4 or moderate.

City of Ottawa.
Today..Sunny. Wind becoming south 20 km/h late this morning. High 25.
 Humidex 30. UV index 6 or high.
Tonight..Becoming cloudy this evening with showers. Risk of a
 thunderstorm late this evening and overnight. Wind south 20 km/h
 becoming light this evening. Low 18.
Sunday..A few showers ending in the afternoon then a mix of sun and
 cloud. Wind becoming southwest 20 km/h late in the morning. High 25.
 Humidex 32. UV index 4 or moderate.

Gatineau.
Today..Sunny. High 24. Humidex 29. UV index 6 or high.
Tonight..Increasing cloudiness. Showers beginning this evening. Risk
 of a thunderstorm late this evening and overnight. Low 17.
Sunday..A few showers ending in the afternoon then clearing. Wind
 becoming west 20 km/h late in the morning. High 25. Humidex 30. UV
 index 4 or moderate.

Prescott and Russell.
Today..Sunny. High 26. Humidex 31. UV index 6 or high.
Tonight..Becoming cloudy this evening with showers. Risk of a
 thunderstorm late this evening and overnight. Low 19.
Sunday..A few showers ending in the afternoon then a mix of sun and
 cloud. High 24. Humidex 32. UV index 2 or low.

Morrisburg - Long Sault
Cornwall - Lancaster
Winchester - Newington.
Today..Sunny. High 26. Humidex 31. UV index 6 or high.
Tonight..Increasing cloudiness. Showers beginning this evening. Risk
 of a thunderstorm late this evening and overnight. Low 20.
Sunday..A few showers ending in the afternoon then cloudy. Wind
 becoming southwest 20 km/h in the afternoon. High 24. Humidex 32. UV
 index 2 or low.

Maxville - Alexandria.
Today..Sunny. High 26. Humidex 30. UV index 6 or high.
Tonight..Becoming cloudy this evening with showers. Risk of a
 thunderstorm late this evening and overnight. Low 17.
Sunday..A few showers ending in the afternoon then a mix of sun and
 cloud. High 24. Humidex 32. UV index 2 or low.

Smiths Falls - Lanark - Sharbot Lake.
Today..Sunny. High 25. Humidex 30. UV index 6 or high.
Tonight..Increasing cloudiness. Showers beginning this evening. Risk
 of a thunderstorm late this evening and overnight. Low 19.
Sunday..A few showers ending in the afternoon then clearing. High 26.
 Humidex 35. UV index 4 or moderate.

Port Carling - Port Severn
Bracebridge - Gravenhurst.
Today..Sunny. Becoming a mix of sun and cloud this morning. High 25.
 Humidex 33. UV index 6 or high.
Tonight..Partly cloudy. Becoming cloudy near midnight with 60 percent
 chance of showers overnight. Risk of a thunderstorm overnight.
 Low 17.
Sunday..Mainly cloudy with 60 percent chance of showers early in the
 morning. Clearing in the morning. Wind becoming northwest 30 km/h
 late in the morning. High 22. Humidex 25. UV index 5 or moderate.

Town of Parry Sound - Rosseau - Killbear Park
Huntsville - Baysville.
Today..Sunny. Becoming a mix of sun and cloud this morning. High 25.
 Humidex 31. UV index 6 or high.
Tonight..Becoming cloudy this evening with a few showers. Risk of a
 thunderstorm. Low 17.
Sunday..Clearing in the morning. Wind becoming west 20 km/h in the
 afternoon. High 22. Humidex 25. UV index 5 or moderate.

Haliburton.
Today..Mainly sunny. High 24. Humidex 29. UV index 6 or high.
Tonight..Increasing cloudiness. 60 percent chance of showers
 overnight with risk of a thunderstorm. Low 18.
Sunday..Cloudy with 60 percent chance of showers early in the
 morning. Clearing in the morning. Wind becoming west 20 km/h in the
 afternoon. High 21. UV index 5 or moderate.

Renfrew - Pembroke - Barry's Bay.
Today..Mainly sunny. High 25. Humidex 30. UV index 6 or high.
Tonight..Increasing cloudiness. A few showers beginning late this
 evening. Risk of a thunderstorm late this evening and overnight.
 Low 18.
Sunday..A few showers ending in the morning then clearing. High 25.
 Humidex 28. UV index 5 or moderate.

Algonquin.
Today..Sunny. Becoming a mix of sun and cloud this afternoon.
 High 24. Humidex 29. UV index 6 or high.
Tonight..Becoming cloudy this evening with a few showers. Risk of a
 thunderstorm. Low 16.
Sunday..Clearing in the morning. High 21. UV index 5 or moderate.

Burk's Falls - Bayfield Inlet.
Today..Sunny. Increasing cloudiness this afternoon. Wind becoming
 south 20 km/h late this afternoon. High 23. Humidex 28. UV index 6
 or high.
Tonight..Cloudy. A few showers beginning this evening. Risk of a
 thunderstorm. Wind south 20 km/h becoming light this evening.
 Low 13.
Sunday..Cloudy. Becoming a mix of sun and cloud in the morning.
 High 21. UV index 5 or moderate.

End
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--- up 6 days, 19 hours, 30 minutes
 * Origin: Northern Realms (618:400/23)