940
FPCN11 CWTO 162223 AAA
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 6:21 P.M. EDT WEDNESDAY 16
SEPTEMBER 2026 FOR TONIGHT THURSDAY AND THURSDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT THURSDAY.
CITY OF TORONTO.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY THIS EVENING. LOW 15.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
HIGH 25. HUMIDEX 28. UV INDEX 7 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
WINDSOR - LEAMINGTON - ESSEX COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS THIS EVENING
AND AFTER MIDNIGHT. A FEW SHOWERS BEGINNING OVERNIGHT. RISK OF A
THUNDERSTORM THIS EVENING AND OVERNIGHT. LOW 17.
THURSDAY..A FEW SHOWERS ENDING IN THE AFTERNOON THEN CLOUDY. RISK OF
A THUNDERSTORM IN THE MORNING. LOCAL AMOUNT 15 TO 25 MM. HIGH 24.
HUMIDEX 30. UV INDEX 4 OR MODERATE.
THURSDAY NIGHT..CLEARING. FOG PATCHES DEVELOPING OVERNIGHT. LOW 14.
CHATHAM-KENT - RONDEAU PARK.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS THIS EVENING
AND AFTER MIDNIGHT. A FEW SHOWERS BEGINNING OVERNIGHT. RISK OF A
THUNDERSTORM THIS EVENING AND OVERNIGHT. LOW 17.
THURSDAY..A FEW SHOWERS ENDING IN THE AFTERNOON THEN MAINLY CLOUDY.
RISK OF A THUNDERSTORM IN THE MORNING. LOCAL AMOUNT 15 TO 25 MM.
HIGH 24. HUMIDEX 30. UV INDEX 4 OR MODERATE.
THURSDAY NIGHT..MAINLY CLOUDY. CLEARING NEAR MIDNIGHT. FOG PATCHES
DEVELOPING OVERNIGHT. LOW 10.
SARNIA - PETROLIA - WESTERN LAMBTON COUNTY.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS CHANGING TO
70 PERCENT CHANCE OF SHOWERS BEFORE MORNING. WIND NORTH 20 KM/H
BECOMING LIGHT AFTER MIDNIGHT. LOW 17.
THURSDAY..MAINLY CLOUDY. 70 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. WIND BECOMING NORTH 20 KM/H IN THE
MORNING. HIGH 23. HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEARING IN THE EVENING. FOG PATCHES DEVELOPING
OVERNIGHT. WIND NORTH 20 KM/H BECOMING LIGHT AFTER MIDNIGHT. LOW 12.
WATFORD - PINERY PARK - EASTERN LAMBTON COUNTY.
TONIGHT..CLOUDY. 30 PERCENT CHANCE OF SHOWERS CHANGING TO 70 PERCENT
CHANCE OF SHOWERS BEFORE MORNING. WIND NORTH 20 KM/H BECOMING LIGHT
LATE THIS EVENING. LOW 17.
THURSDAY..MAINLY CLOUDY. 70 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 23. HUMIDEX 27. UV INDEX 5 OR
MODERATE.
THURSDAY NIGHT..CLEARING IN THE EVENING. FOG PATCHES DEVELOPING
OVERNIGHT. LOW 11.
RODNEY - SHEDDEN - WESTERN ELGIN COUNTY.
TONIGHT..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 16.
THURSDAY..CLOUDY. 70 PERCENT CHANCE OF SHOWERS IN THE MORNING AND
EARLY IN THE AFTERNOON. HIGH 25. HUMIDEX 31. UV INDEX 5 OR MODERATE.
THURSDAY NIGHT..CLEARING. LOW 11.
ST. THOMAS - AYLMER - EASTERN ELGIN COUNTY.
TONIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 16.
THURSDAY..CLOUDY. 70 PERCENT CHANCE OF SHOWERS IN THE MORNING AND
EARLY IN THE AFTERNOON. HIGH 25. HUMIDEX 31. UV INDEX 5 OR MODERATE.
THURSDAY NIGHT..CLEARING LATE IN THE EVENING. LOW 11.
STRATHROY - KOMOKA - WESTERN MIDDLESEX COUNTY.
TONIGHT..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS CHANGING TO
70 PERCENT CHANCE OF SHOWERS BEFORE MORNING. LOW 15.
THURSDAY..MAINLY CLOUDY. 70 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 24. HUMIDEX 29. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEARING IN THE EVENING. LOW 10.
LONDON - PARKHILL - EASTERN MIDDLESEX COUNTY.
TONIGHT..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS CHANGING TO
70 PERCENT CHANCE OF SHOWERS BEFORE MORNING. LOW 15.
THURSDAY..MAINLY CLOUDY. 70 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 24. HUMIDEX 29. UV INDEX 5 OR
MODERATE.
THURSDAY NIGHT..CLEAR. LOW 10.
SIMCOE - DELHI - NORFOLK.
TONIGHT..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW 15.
THURSDAY..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. HIGH 25. HUMIDEX
30. UV INDEX 5 OR MODERATE.
THURSDAY NIGHT..CLEAR. LOW 9.
DUNNVILLE - CALEDONIA - HALDIMAND.
TONIGHT..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW 16.
THURSDAY..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. HIGH 24.
HUMIDEX 29. UV INDEX 5 OR MODERATE.
THURSDAY NIGHT..CLEARING IN THE EVENING. LOW 10.
WOODSTOCK - TILLSONBURG - OXFORD COUNTY.
TONIGHT..BECOMING CLOUDY THIS EVENING WITH 30 PERCENT CHANCE OF
SHOWERS THIS EVENING AND OVERNIGHT. LOW 15.
THURSDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 25. HUMIDEX 28. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
BRANTFORD - COUNTY OF BRANT.
TONIGHT..BECOMING CLOUDY THIS EVENING WITH 30 PERCENT CHANCE OF
SHOWERS THIS EVENING AND OVERNIGHT. LOW 15.
THURSDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 25. HUMIDEX 28. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TONIGHT..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW 18.
THURSDAY..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. BECOMING A MIX OF
SUN AND CLOUD LATE IN THE AFTERNOON. HIGH 23. HUMIDEX 28. UV INDEX 5
OR MODERATE.
THURSDAY NIGHT..CLEARING LATE IN THE EVENING. LOW 13.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TONIGHT..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW 18.
THURSDAY..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. HIGH 23.
HUMIDEX 28. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 13.
CITY OF HAMILTON.
TONIGHT..BECOMING CLOUDY THIS EVENING WITH 30 PERCENT CHANCE OF
SHOWERS THIS EVENING AND OVERNIGHT. LOW 16.
THURSDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 23. HUMIDEX 28. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
BURLINGTON - OAKVILLE.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT. 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 14.
THURSDAY..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. HIGH 23.
HUMIDEX 27. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
HALTON HILLS - MILTON.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT. 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 14.
THURSDAY..MAINLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. HIGH 23.
HUMIDEX 27. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
MISSISSAUGA - BRAMPTON.
TONIGHT..CLOUDY. 30 PERCENT CHANCE OF SHOWERS OVERNIGHT. LOW 14.
THURSDAY..A MIX OF SUN AND CLOUD WITH 40 PERCENT CHANCE OF SHOWERS.
HIGH 23. HUMIDEX 27. UV INDEX 7 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 11.
CALEDON.
TONIGHT..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
FOG PATCHES DEVELOPING OVERNIGHT. LOW 13.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
FOG PATCHES DISSIPATING IN THE MORNING. HIGH 22. HUMIDEX 25. UV
INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
VAUGHAN - RICHMOND HILL - MARKHAM.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY LATE THIS EVENING. LOW 12.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
HIGH 24. HUMIDEX 26. UV INDEX 7 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 12.
NEWMARKET - GEORGINA - NORTHERN YORK REGION.
TONIGHT..A FEW CLOUDS. INCREASING CLOUDINESS LATE THIS EVENING THEN
30 PERCENT CHANCE OF SHOWERS BEFORE MORNING. FOG PATCHES DEVELOPING
OVERNIGHT. LOW 11.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
BECOMING SUNNY LATE IN THE AFTERNOON. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 23. HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
PICKERING - OSHAWA - SOUTHERN DURHAM REGION.
TONIGHT..INCREASING CLOUDINESS LATE THIS EVENING. LOW 12.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
HIGH 24. HUMIDEX 26. UV INDEX 7 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 12.
UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION.
TONIGHT..CLEAR. INCREASING CLOUDINESS LATE THIS EVENING THEN
30 PERCENT CHANCE OF SHOWERS BEFORE MORNING. FOG PATCHES DEVELOPING
OVERNIGHT. LOW 11.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
BECOMING SUNNY LATE IN THE AFTERNOON. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 23. HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE THIS
EVENING AND OVERNIGHT. LOW 12.
THURSDAY..A MIX OF SUN AND CLOUD WITH 40 PERCENT CHANCE OF SHOWERS IN
THE MORNING AND EARLY IN THE AFTERNOON. CLEARING LATE IN THE
AFTERNOON. WIND BECOMING NORTH 20 KM/H IN THE AFTERNOON. HIGH 23.
HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. WIND NORTH
20 KM/H BECOMING LIGHT NEAR MIDNIGHT. LOW 9.
WINGHAM - BLYTH - NORTHERN HURON COUNTY.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS LATE THIS
EVENING AND OVERNIGHT. LOW 12.
THURSDAY..A MIX OF SUN AND CLOUD WITH 40 PERCENT CHANCE OF SHOWERS IN
THE MORNING AND EARLY IN THE AFTERNOON. BECOMING SUNNY LATE IN THE
AFTERNOON. WIND BECOMING NORTH 20 KM/H IN THE AFTERNOON. HIGH 23.
HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. WIND NORTH
20 KM/H BECOMING LIGHT NEAR MIDNIGHT. LOW 9.
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 12.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. WIND BECOMING NORTH 20 KM/H IN THE
AFTERNOON. HIGH 23. HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. WIND NORTH 20 KM/H BECOMING LIGHT NEAR
MIDNIGHT. LOW 9.
LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 12.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. WIND BECOMING NORTH 20 KM/H IN THE
AFTERNOON. HIGH 23. HUMIDEX 26. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. WIND NORTH 20 KM/H BECOMING LIGHT NEAR
MIDNIGHT. LOW 9.
KITCHENER - CAMBRIDGE - REGION OF WATERLOO.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 13.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 24. HUMIDEX 27. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 13.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 24. HUMIDEX 27. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY.
TONIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 13.
THURSDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING
AND EARLY IN THE AFTERNOON. HIGH 24. HUMIDEX 27. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
FOG PATCHES DEVELOPING OVERNIGHT. LOW 10.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
BECOMING SUNNY LATE IN THE AFTERNOON. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 22. HUMIDEX 25. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
SHELBURNE - MANSFIELD - NORTHERN DUFFERIN COUNTY.
TONIGHT..INCREASING CLOUDINESS. 30 PERCENT CHANCE OF SHOWERS BEFORE
MORNING. FOG PATCHES DEVELOPING OVERNIGHT. LOW 10.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
BECOMING SUNNY LATE IN THE AFTERNOON. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 22. HUMIDEX 25. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
INNISFIL - NEW TECUMSETH - ANGUS.
TONIGHT..CLEAR THIS EVENING THEN PARTLY CLOUDY WITH 30 PERCENT CHANCE
OF SHOWERS BEFORE MORNING. FOG PATCHES DEVELOPING OVERNIGHT. LOW 10.
THURSDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS.
BECOMING SUNNY LATE IN THE AFTERNOON. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 22. HUMIDEX 25. UV INDEX 6 OR HIGH.
THURSDAY NIGHT..CLEAR. LOW 10.
REMAINDER UNCHANGED.
END
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