978
FPCN11 CWTO 090240 AAA
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 10:39 P.M. EDT TUESDAY 8
SEPTEMBER 2026 FOR TONIGHT WEDNESDAY AND WEDNESDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT
WEDNESDAY.
WINDSOR - LEAMINGTON - ESSEX COUNTY.
TONIGHT..CLEAR LATE THIS EVENING THEN PARTLY CLOUDY WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 21.
WEDNESDAY..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS EARLY IN THE
AFTERNOON. A FEW SHOWERS BEGINNING IN THE AFTERNOON. RISK OF A
THUNDERSTORM IN THE AFTERNOON. WIND SOUTHWEST 30 KM/H GUSTING TO 50.
HIGH 28. HUMIDEX 35. UV INDEX 7 OR HIGH.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING EARLY IN THE EVENING THEN
MAINLY CLOUDY. RISK OF A THUNDERSTORM EARLY IN THE EVENING. WIND
WEST 20 KM/H GUSTING TO 40. LOW 18.
CHATHAM-KENT - RONDEAU PARK.
TONIGHT..CLEAR LATE THIS EVENING THEN PARTLY CLOUDY WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 21.
WEDNESDAY..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS EARLY IN THE
AFTERNOON. A FEW SHOWERS BEGINNING IN THE AFTERNOON. RISK OF A
THUNDERSTORM IN THE AFTERNOON. WIND SOUTHWEST 30 KM/H GUSTING TO 50.
HIGH 27. HUMIDEX 35. UV INDEX 7 OR HIGH.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING EARLY IN THE EVENING THEN
MAINLY CLOUDY. RISK OF A THUNDERSTORM EARLY IN THE EVENING. WIND
WEST 20 KM/H GUSTING TO 40. LOW 18.
SARNIA - PETROLIA - WESTERN LAMBTON COUNTY.
TONIGHT..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS OVERNIGHT.
LOW 21.
WEDNESDAY..CLOUDY. 30 PERCENT CHANCE OF SHOWERS EARLY IN THE
AFTERNOON. A FEW SHOWERS BEGINNING IN THE AFTERNOON. RISK OF A
THUNDERSTORM IN THE AFTERNOON. WIND SOUTHWEST 30 KM/H GUSTING TO 50.
HIGH 27. HUMIDEX 35. UV INDEX 5 OR MODERATE.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING EARLY IN THE EVENING THEN
MAINLY CLOUDY. RISK OF A THUNDERSTORM EARLY IN THE EVENING. WIND
WEST 20 KM/H GUSTING TO 40. LOW 18.
WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY.
TONIGHT..INCREASING CLOUDINESS LATE THIS EVENING. 30 PERCENT CHANCE
OF SHOWERS OVERNIGHT. LOW 20.
WEDNESDAY..CLOUDY. A FEW SHOWERS BEGINNING NEAR NOON. RISK OF A
THUNDERSTORM IN THE AFTERNOON. LOCAL AMOUNT 10 TO 15 MM. WIND
SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 26. HUMIDEX 34. UV INDEX 4 OR
MODERATE.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING IN THE EVENING THEN MAINLY
CLOUDY. RISK OF A THUNDERSTORM EARLY IN THE EVENING. WIND WEST
20 KM/H GUSTING TO 40. LOW 18.
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY.
TONIGHT..CLOUDY. 30 PERCENT CHANCE OF SHOWERS OVERNIGHT. LOW 19.
WEDNESDAY..SHOWERS WITH RISK OF A THUNDERSTORM. LOCAL AMOUNT 15 TO
25 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 25. HUMIDEX 33. UV
INDEX 3 OR MODERATE.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING IN THE EVENING THEN MAINLY
CLOUDY. RISK OF A THUNDERSTORM EARLY IN THE EVENING. WIND SOUTHWEST
30 KM/H GUSTING TO 50. LOW 16.
WINGHAM - BLYTH - NORTHERN HURON COUNTY.
TONIGHT..CLOUDY. 30 PERCENT CHANCE OF SHOWERS OVERNIGHT. LOW 19.
WEDNESDAY..SHOWERS WITH RISK OF A THUNDERSTORM. LOCAL AMOUNT 15 TO
25 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 24. HUMIDEX 32. UV
INDEX 3 OR MODERATE.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING IN THE EVENING THEN MAINLY
CLOUDY. RISK OF A THUNDERSTORM EARLY IN THE EVENING. WIND SOUTHWEST
30 KM/H GUSTING TO 50. LOW 15.
SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY.
TONIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 19.
WEDNESDAY..SHOWERS WITH RISK OF A THUNDERSTORM. LOCAL AMOUNT 15 TO
25 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 24. HUMIDEX 32. UV
INDEX 3 OR MODERATE.
WEDNESDAY NIGHT..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN
THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 14.
BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY.
TONIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. WIND BECOMING
SOUTH 20 KM/H NEAR MIDNIGHT. LOW 20.
WEDNESDAY..SHOWERS ENDING LATE IN THE AFTERNOON THEN A MIX OF SUN AND
CLOUD. RISK OF A THUNDERSTORM IN THE MORNING AND AFTERNOON. LOCAL
AMOUNT 10 TO 20 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 23.
HUMIDEX 31. UV INDEX 3 OR MODERATE.
WEDNESDAY NIGHT..MAINLY CLOUDY. WIND SOUTHWEST 30 KM/H GUSTING TO 50
BECOMING NORTHWEST 20 GUSTING TO 40 NEAR MIDNIGHT. LOW 14.
HANOVER - DUNDALK - SOUTHERN GREY COUNTY.
TONIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS OVERNIGHT. LOW 19.
WEDNESDAY..SHOWERS WITH RISK OF A THUNDERSTORM. LOCAL AMOUNT 15 TO
25 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 23. HUMIDEX 31. UV
INDEX 3 OR MODERATE.
WEDNESDAY NIGHT..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN
THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 13.
OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY.
TONIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS OVERNIGHT. LOW 19.
WEDNESDAY..SHOWERS WITH RISK OF A THUNDERSTORM. LOCAL AMOUNT 15 TO
25 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 24. HUMIDEX 32. UV
INDEX 3 OR MODERATE.
WEDNESDAY NIGHT..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN
THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 13.
REMAINDER UNCHANGED.
END
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