866
FPCN11 CWTO 171517 AAB
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 11:16 A.M. EDT THURSDAY 17
SEPTEMBER 2026 FOR TODAY AND FRIDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 3:30 P.M. EDT.
CITY OF TORONTO.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. HIGH 24. HUMIDEX 28. UV INDEX 7 OR HIGH.
TONIGHT..A FEW CLOUDS. LOW 14.
FRIDAY..MAINLY SUNNY. HIGH 22. UV INDEX 6 OR HIGH.
SIMCOE - DELHI - NORFOLK.
TODAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS AFTERNOON. HIGH 24.
HUMIDEX 29. UV INDEX 5 OR MODERATE.
TONIGHT..CLOUDY. BECOMING PARTLY CLOUDY AFTER MIDNIGHT. LOW 9.
FRIDAY..INCREASING CLOUDINESS IN THE MORNING. HIGH 24. HUMIDEX 27. UV
INDEX 7 OR HIGH.
DUNNVILLE - CALEDONIA - HALDIMAND.
TODAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS AFTERNOON. HIGH 24.
HUMIDEX 29. UV INDEX 5 OR MODERATE.
TONIGHT..CLOUDY. CLEARING AFTER MIDNIGHT. LOW 10.
FRIDAY..A MIX OF SUN AND CLOUD. HIGH 23. HUMIDEX 26. UV INDEX 7 OR
HIGH.
BRANTFORD - COUNTY OF BRANT.
TODAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS AFTERNOON. HIGH 24.
HUMIDEX 27. UV INDEX 6 OR HIGH.
TONIGHT..CLOUDY. CLEARING AFTER MIDNIGHT. LOW 11.
FRIDAY..A MIX OF SUN AND CLOUD. HIGH 24. HUMIDEX 26. UV INDEX 7 OR
HIGH.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TODAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS AFTERNOON. HIGH 24.
HUMIDEX 31. UV INDEX 5 OR MODERATE.
TONIGHT..CLOUDY. BECOMING PARTLY CLOUDY NEAR MIDNIGHT. LOW 13.
FRIDAY..MAINLY CLOUDY. CLEARING IN THE AFTERNOON. HIGH 22. UV INDEX 7
OR HIGH.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TODAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS AFTERNOON.
HIGH 23. HUMIDEX 28. UV INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY. CLEARING AFTER MIDNIGHT. LOW 13.
FRIDAY..A MIX OF SUN AND CLOUD. CLEARING EARLY IN THE AFTERNOON.
HIGH 22. UV INDEX 6 OR HIGH.
CITY OF HAMILTON.
TODAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS AFTERNOON. HIGH 23.
HUMIDEX 28. UV INDEX 6 OR HIGH.
TONIGHT..CLOUDY. CLEARING NEAR MIDNIGHT. LOW 11.
FRIDAY..A MIX OF SUN AND CLOUD. HIGH 22. UV INDEX 7 OR HIGH.
BURLINGTON - OAKVILLE.
TODAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. HIGH 23. HUMIDEX 27. UV INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY. CLEARING LATE THIS EVENING. LOW 13.
FRIDAY..MAINLY SUNNY. HIGH 22. UV INDEX 6 OR HIGH.
HALTON HILLS - MILTON.
TODAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. HIGH 23. HUMIDEX 27. UV INDEX 7 OR HIGH.
TONIGHT..PARTLY CLOUDY. CLEARING LATE THIS EVENING. LOW 11.
FRIDAY..A MIX OF SUN AND CLOUD. HIGH 22. UV INDEX 6 OR HIGH.
MISSISSAUGA - BRAMPTON.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. HIGH 24. HUMIDEX 29. UV INDEX 7 OR HIGH.
TONIGHT..A FEW CLOUDS. LOW 13.
FRIDAY..MAINLY SUNNY. HIGH 22. UV INDEX 6 OR HIGH.
VAUGHAN - RICHMOND HILL - MARKHAM.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. HIGH 24. HUMIDEX 28. UV INDEX 7 OR HIGH.
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY OVERNIGHT. LOW 12.
FRIDAY..MAINLY SUNNY. HIGH 22. UV INDEX 6 OR HIGH.
NEWMARKET - GEORGINA - NORTHERN YORK REGION.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. CLEARING THIS AFTERNOON. HIGH 23. HUMIDEX 25. UV INDEX 6
OR HIGH.
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY AFTER MIDNIGHT. LOW 10.
FRIDAY..MAINLY SUNNY. HIGH 21. UV INDEX 6 OR HIGH.
PICKERING - OSHAWA - SOUTHERN DURHAM REGION.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. CLEARING THIS AFTERNOON. HIGH 23. HUMIDEX 27. UV INDEX 7
OR HIGH.
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY AFTER MIDNIGHT. LOW 12.
FRIDAY..MAINLY SUNNY. HIGH 22. UV INDEX 6 OR HIGH.
UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS THIS
AFTERNOON. CLEARING THIS AFTERNOON. HIGH 23. HUMIDEX 25. UV INDEX 6
OR HIGH.
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY AFTER MIDNIGHT. LOW 10.
FRIDAY..MAINLY SUNNY. HIGH 21. UV INDEX 6 OR HIGH.
REMAINDER UNCHANGED.
END
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