480
FPCN11 CWTO 090643 AAB
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 2:41 A.M. EDT WEDNESDAY 9
SEPTEMBER 2026 FOR TONIGHT WEDNESDAY AND WEDNESDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT.
WINDSOR - LEAMINGTON - ESSEX COUNTY.
TONIGHT..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
LOW 21.
WEDNESDAY..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS IN THE
MORNING AND EARLY IN THE AFTERNOON. A FEW SHOWERS BEGINNING IN THE
AFTERNOON. RISK OF A THUNDERSTORM LATE IN THE MORNING AND 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..PARTLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
LOW 21.
WEDNESDAY..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS IN THE
MORNING AND EARLY IN THE AFTERNOON. A FEW SHOWERS BEGINNING IN THE
AFTERNOON. RISK OF A THUNDERSTORM LATE IN THE MORNING AND 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..CLOUDY. 40 PERCENT CHANCE OF SHOWERS BEFORE MORNING. LOW 21.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM LATE IN THE
MORNING AND IN THE AFTERNOON. WIND SOUTHWEST 30 KM/H GUSTING TO 50.
HIGH 27. HUMIDEX 35. 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 WEST
20 KM/H GUSTING TO 40. LOW 18.
WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE
MORNING. A FEW SHOWERS BEGINNING IN THE MORNING. RISK OF A
THUNDERSTORM LATE IN THE MORNING AND IN THE AFTERNOON. LOCAL AMOUNT
10 TO 15 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 26. HUMIDEX
34. 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 WEST
20 KM/H GUSTING TO 40. LOW 18.
RODNEY - SHEDDEN - WESTERN ELGIN COUNTY.
TONIGHT..PARTLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE
MORNING. A FEW SHOWERS BEGINNING IN THE MORNING. RISK OF A
THUNDERSTORM LATE IN THE MORNING AND IN THE AFTERNOON. LOCAL AMOUNT
10 TO 15 MM. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 27. HUMIDEX
34. 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 WEST
20 KM/H GUSTING TO 40. LOW 18.
ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM LATE IN THE
MORNING AND IN THE AFTERNOON. LOCAL AMOUNT 10 TO 15 MM. WIND
SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 26. HUMIDEX 34. 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 WEST
20 KM/H GUSTING TO 40. LOW 18.
STRATHROY - KOMOKA - WESTERN MIDDLESEX COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM LATE IN THE
MORNING AND IN THE AFTERNOON. LOCAL AMOUNT 10 TO 15 MM. WIND
SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 26. HUMIDEX 34. 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 WEST
20 KM/H GUSTING TO 40. LOW 18.
LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM LATE IN THE
MORNING AND IN THE AFTERNOON. LOCAL AMOUNT 10 TO 15 MM. WIND
SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 26. HUMIDEX 34. 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 WEST
20 KM/H GUSTING TO 40. LOW 18.
SIMCOE - DELHI - NORFOLK.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 19.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. 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 WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 18.
DUNNVILLE - CALEDONIA - HALDIMAND.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING NEAR NOON. RISK OF A THUNDERSTORM IN THE
AFTERNOON. 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 WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 20.
WOODSTOCK - TILLSONBURG - OXFORD COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 18.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. 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 WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 18.
BRANTFORD - COUNTY OF BRANT.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 18.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. 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 WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 18.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING NEAR NOON. RISK OF A THUNDERSTORM IN THE
AFTERNOON. WIND SOUTHWEST 30 KM/H GUSTING TO 50. HIGH 26. HUMIDEX
34. UV INDEX 5 OR MODERATE.
WEDNESDAY NIGHT..A FEW SHOWERS ENDING IN THE EVENING THEN MAINLY
CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 20.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 20.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. A FEW
SHOWERS BEGINNING NEAR NOON. RISK OF A THUNDERSTORM IN THE
AFTERNOON. 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 WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 19.
CITY OF HAMILTON.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 19.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING. 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 WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
EARLY IN THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 18.
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY.
TONIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 19.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN THE MORNING.
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM IN THE
MORNING AND AFTERNOON. 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..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS IN THE
EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 16.
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.
TONIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 17.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN THE MORNING.
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM LATE IN THE
MORNING AND IN THE AFTERNOON. 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..SHOWERS ENDING IN THE EVENING THEN MAINLY CLOUDY
WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM EARLY IN
THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 16.
KITCHENER - CAMBRIDGE - REGION OF WATERLOO.
TONIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 17.
WEDNESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN THE MORNING.
SHOWERS BEGINNING IN THE MORNING. RISK OF A THUNDERSTORM LATE IN THE
MORNING AND IN THE AFTERNOON. 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..SHOWERS ENDING IN THE EVENING THEN MAINLY CLOUDY
WITH 30 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM EARLY IN
THE EVENING. WIND SOUTHWEST 30 KM/H GUSTING TO 50. LOW 16.
REMAINDER UNCHANGED.
END
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page