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FPCN11 CWTO 131152 AAA
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 7:51 A.M. EDT SUNDAY 13
SEPTEMBER 2026 FOR TODAY AND MONDAY.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 11:00 A.M. EDT.
WINDSOR - LEAMINGTON - ESSEX COUNTY.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON. FOG PATCHES DISSIPATING THIS MORNING. WIND BECOMING WEST
20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX 31. UV INDEX 6 OR
HIGH.
TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS THIS EVENING
AND AFTER MIDNIGHT. BECOMING CLEAR OVERNIGHT. WIND NORTHWEST 20 KM/H
GUSTING TO 40. LOW 12.
MONDAY..SUNNY. HIGH 21. UV INDEX 6 OR HIGH.
CHATHAM-KENT - RONDEAU PARK.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON. FOG PATCHES DISSIPATING THIS MORNING. WIND BECOMING WEST
20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX 31. UV INDEX 6 OR
HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS THIS EVENING AND
AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 12.
MONDAY..A MIX OF SUN AND CLOUD. HIGH 21. UV INDEX 6 OR HIGH.
SARNIA - PETROLIA - WESTERN LAMBTON COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 25. HUMIDEX
29. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS THIS EVENING.
WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 11.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. HIGH 20. UV INDEX 6 OR HIGH.
WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 25. HUMIDEX
29. UV INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS THIS
EVENING. CLEARING OVERNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40.
LOW 11.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. HIGH 20. UV INDEX 6 OR HIGH.
RODNEY - SHEDDEN - WESTERN ELGIN COUNTY.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON. FOG PATCHES DISSIPATING THIS MORNING. WIND BECOMING WEST
20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX 31. UV INDEX 6 OR
HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS THIS EVENING AND
AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 12.
MONDAY..A MIX OF SUN AND CLOUD. HIGH 21. UV INDEX 5 OR MODERATE.
ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY.
TODAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON. FOG PATCHES DISSIPATING THIS MORNING. WIND BECOMING WEST
20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX 31. UV INDEX 6 OR
HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS THIS EVENING AND
AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 12.
MONDAY..MAINLY CLOUDY. HIGH 21. UV INDEX 5 OR MODERATE.
STRATHROY - KOMOKA - WESTERN MIDDLESEX COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 25. HUMIDEX
29. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS THIS EVENING.
WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 11.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. HIGH 20. UV INDEX 5 OR MODERATE.
LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 25. HUMIDEX
29. UV INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS THIS
EVENING. CLEARING OVERNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40.
LOW 11.
MONDAY..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS EARLY IN THE
MORNING. HIGH 20. UV INDEX 5 OR MODERATE.
SIMCOE - DELHI - NORFOLK.
TODAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON WITH RISK OF A THUNDERSTORM. FOG PATCHES DISSIPATING THIS
MORNING. WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON.
HIGH 26. HUMIDEX 33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE THIS
EVENING AND AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40.
LOW 13.
MONDAY..INCREASING CLOUDINESS IN THE MORNING. HIGH 20. UV INDEX 5 OR
MODERATE.
DUNNVILLE - CALEDONIA - HALDIMAND.
TODAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON WITH RISK OF A THUNDERSTORM. FOG PATCHES DISSIPATING THIS
MORNING. WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON.
HIGH 26. HUMIDEX 33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE THIS
EVENING AND AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40.
LOW 13.
MONDAY..SUNNY. INCREASING CLOUDINESS LATE IN THE MORNING. HIGH 20. UV
INDEX 6 OR HIGH.
WOODSTOCK - TILLSONBURG - OXFORD COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX
33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS EVENING AND
AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 10.
MONDAY..A MIX OF SUN AND CLOUD. HIGH 20. UV INDEX 5 OR MODERATE.
BRANTFORD - COUNTY OF BRANT.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX
33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS EVENING AND
AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 10.
MONDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD IN THE MORNING.
HIGH 20. UV INDEX 6 OR HIGH.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TODAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON WITH RISK OF A THUNDERSTORM. FOG PATCHES DISSIPATING THIS
MORNING. WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON.
HIGH 26. HUMIDEX 33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE THIS
EVENING AND AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40.
LOW 13.
MONDAY..A MIX OF SUN AND CLOUD. HIGH 20. UV INDEX 6 OR HIGH.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TODAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON WITH RISK OF A THUNDERSTORM. FOG PATCHES DISSIPATING THIS
MORNING. WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON.
HIGH 26. HUMIDEX 33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE THIS
EVENING AND AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40.
LOW 13.
MONDAY..A MIX OF SUN AND CLOUD. HIGH 20. UV INDEX 6 OR HIGH.
CITY OF HAMILTON.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING WEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 26. HUMIDEX
33. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS THIS EVENING AND
AFTER MIDNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40. LOW 10.
MONDAY..SUNNY. INCREASING CLOUDINESS LATE IN THE MORNING. HIGH 20. UV
INDEX 6 OR HIGH.
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY.
TODAY..A MIX OF SUN AND CLOUD. 70 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON. FOG PATCHES DISSIPATING THIS MORNING. WIND BECOMING
NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 20. UV INDEX 6 OR
HIGH.
TONIGHT..MAINLY CLOUDY WITH 70 PERCENT CHANCE OF SHOWERS THIS EVENING
AND 30 PERCENT CHANCE OF SHOWERS OVERNIGHT. WIND NORTHWEST 20 KM/H
GUSTING TO 40 BECOMING LIGHT OVERNIGHT. LOW 10.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. HIGH 18. UV INDEX 5 OR MODERATE.
WINGHAM - BLYTH - NORTHERN HURON COUNTY.
TODAY..A MIX OF SUN AND CLOUD. 70 PERCENT CHANCE OF SHOWERS LATE THIS
AFTERNOON. FOG PATCHES DISSIPATING THIS MORNING. WIND BECOMING
NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 20. UV INDEX 6 OR
HIGH.
TONIGHT..PARTLY CLOUDY WITH 70 PERCENT CHANCE OF SHOWERS THIS EVENING
AND 30 PERCENT CHANCE OF SHOWERS OVERNIGHT. WIND NORTHWEST 20 KM/H
GUSTING TO 40 BECOMING LIGHT OVERNIGHT. LOW 10.
MONDAY..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS EARLY IN THE
MORNING. HIGH 18. UV INDEX 5 OR MODERATE.
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 23.
HUMIDEX 26. UV INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS THIS
EVENING. CLEARING OVERNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40
BECOMING LIGHT OVERNIGHT. LOW 9.
MONDAY..A MIX OF SUN AND CLOUD. HIGH 19. UV INDEX 5 OR MODERATE.
LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 21. UV
INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS THIS
EVENING. CLEARING OVERNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40
BECOMING LIGHT OVERNIGHT. LOW 8.
MONDAY..MAINLY CLOUDY. HIGH 18. UV INDEX 5 OR MODERATE.
KITCHENER - CAMBRIDGE - REGION OF WATERLOO.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 23.
HUMIDEX 26. UV INDEX 6 OR HIGH.
TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS THIS
EVENING. CLEARING OVERNIGHT. WIND NORTHWEST 20 KM/H GUSTING TO 40
BECOMING LIGHT OVERNIGHT. LOW 9.
MONDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD IN THE MORNING.
HIGH 19. UV INDEX 6 OR HIGH.
GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 23.
HUMIDEX 26. UV INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS THIS EVENING.
WIND NORTHWEST 20 KM/H GUSTING TO 40 BECOMING LIGHT OVERNIGHT.
LOW 9.
MONDAY..INCREASING CLOUDINESS. HIGH 19. UV INDEX 6 OR HIGH.
MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY.
TODAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING THIS MORNING.
WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40 NEAR NOON. HIGH 21. UV
INDEX 6 OR HIGH.
TONIGHT..PARTLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS THIS EVENING.
WIND NORTHWEST 20 KM/H GUSTING TO 40 BECOMING LIGHT OVERNIGHT.
LOW 8.
MONDAY..MAINLY CLOUDY. HIGH 18. UV INDEX 5 OR MODERATE.
REMAINDER UNCHANGED.
END
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