416
FPCN11 CWTO 030131 AAC
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 9:30 P.M. EDT WEDNESDAY 2
SEPTEMBER 2026 FOR TONIGHT THURSDAY AND THURSDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT THURSDAY.
CHATHAM-KENT - RONDEAU PARK.
TONIGHT..SHOWERS WITH THUNDERSTORMS. LOCAL AMOUNT 15 TO 25 MM.
LOW 21.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN THE
MORNING. 60 PERCENT CHANCE OF SHOWERS IN THE AFTERNOON. RISK OF A
THUNDERSTORM. HIGH 29. HUMIDEX 37. UV INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 20.
SARNIA - PETROLIA - WESTERN LAMBTON COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS. LOCAL AMOUNT 15 TO 25 MM.
LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS EARLY IN THE
MORNING. 60 PERCENT CHANCE OF SHOWERS IN THE AFTERNOON. RISK OF A
THUNDERSTORM. HIGH 27. HUMIDEX 35. UV INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 19.
WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 15 TO 25 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 19.
RODNEY - SHEDDEN - WESTERN ELGIN COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 15 TO 25 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 28. HUMIDEX 36. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 19.
ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 15 TO 25 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 28. HUMIDEX 36. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 19.
STRATHROY - KOMOKA - WESTERN MIDDLESEX COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN MAINLY
CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
OVERNIGHT. LOCAL AMOUNT 15 TO 25 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 18.
LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN MAINLY
CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
OVERNIGHT. LOCAL AMOUNT 15 TO 25 MM. LOW 19.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 18.
SIMCOE - DELHI - NORFOLK.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 20 TO 30 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 28. HUMIDEX 36. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
AND AFTER MIDNIGHT WITH RISK OF A THUNDERSTORM. LOW 18.
DUNNVILLE - CALEDONIA - HALDIMAND.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 20 TO 30 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
AND AFTER MIDNIGHT WITH RISK OF A THUNDERSTORM. LOW 18.
WOODSTOCK - TILLSONBURG - OXFORD COUNTY.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 20 TO 30 MM. LOW 19.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
WITH RISK OF A THUNDERSTORM. LOW 17.
BRANTFORD - COUNTY OF BRANT.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 20 TO 30 MM. LOW 19.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 28. HUMIDEX 36. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
WITH RISK OF A THUNDERSTORM. LOW 17.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 20 TO 30 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 7 OR HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
AND AFTER MIDNIGHT WITH RISK OF A THUNDERSTORM. LOW 19.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN CLOUDY
WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM OVERNIGHT.
LOCAL AMOUNT 20 TO 30 MM. LOW 20.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 27. HUMIDEX 35. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
AND AFTER MIDNIGHT WITH RISK OF A THUNDERSTORM. LOW 19.
CITY OF HAMILTON.
TONIGHT..SHOWERS WITH THUNDERSTORMS ENDING AFTER MIDNIGHT THEN MAINLY
CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. RISK OF A THUNDERSTORM
OVERNIGHT. LOCAL AMOUNT 20 TO 30 MM. LOW 19.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 28. HUMIDEX 36. UV
INDEX 8 OR VERY HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
WITH RISK OF A THUNDERSTORM. LOW 18.
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS AND RISK OF
A THUNDERSTORM. LOW 18.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS LATE IN THE
AFTERNOON WITH RISK OF A THUNDERSTORM. HIGH 26. HUMIDEX 34. UV
INDEX 7 OR HIGH.
THURSDAY NIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE EVENING
AND AFTER MIDNIGHT WITH RISK OF A THUNDERSTORM. LOW 16.
REMAINDER UNCHANGED.
END
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