648   
FPCN11 CWTO 152229 AAA  
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL  
REGION ISSUED BY ENVIRONMENT CANADA AT 6:28 P.M. EDT SATURDAY 15  
AUGUST 2026 FOR TONIGHT SUNDAY AND SUNDAY NIGHT.  
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT SUNDAY.  
  
CITY OF TORONTO.  
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY OVERNIGHT. WIND EAST 20 KM/H  
 GUSTING TO 40. LOW 19.  
SUNDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS LATE IN THE  
 AFTERNOON WITH RISK OF A THUNDERSTORM. WIND EAST 20 KM/H BECOMING  
 LIGHT LATE IN THE MORNING. HIGH 26. HUMIDEX 32. UV INDEX 8 OR VERY  
 HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. WIND BECOMING NORTHWEST 20 KM/H BEFORE  
 MORNING. LOW 20.  
  
VAUGHAN - RICHMOND HILL - MARKHAM.  
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY BEFORE MORNING. LOW 17.  
SUNDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS LATE IN THE  
 AFTERNOON WITH RISK OF A THUNDERSTORM. WIND SOUTHEAST 20 KM/H  
 BECOMING LIGHT LATE IN THE MORNING. HIGH 26. HUMIDEX 32. UV INDEX 8  
 OR VERY HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. WIND BECOMING NORTHWEST 20 KM/H BEFORE  
 MORNING. LOW 19.  
  
NEWMARKET - GEORGINA - NORTHERN YORK REGION.  
TONIGHT..CLEAR. LOW 15.  
SUNDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS LATE IN THE  
 AFTERNOON WITH RISK OF A THUNDERSTORM. WIND SOUTHEAST 20 KM/H  
 BECOMING LIGHT IN THE AFTERNOON. HIGH 26. HUMIDEX 32. UV INDEX 7 OR  
 HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. LOW 19.  
  
PICKERING - OSHAWA - SOUTHERN DURHAM REGION.  
TONIGHT..CLEAR. LOW 16.  
SUNDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS LATE IN THE  
 AFTERNOON WITH RISK OF A THUNDERSTORM. WIND EAST 20 KM/H BECOMING  
 LIGHT LATE IN THE MORNING. HIGH 26. HUMIDEX 32. UV INDEX 8 OR VERY  
 HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. LOW 19.  
  
UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION.  
TONIGHT..CLEAR. LOW 15.  
SUNDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS LATE IN THE  
 AFTERNOON WITH RISK OF A THUNDERSTORM. WIND SOUTHEAST 20 KM/H  
 BECOMING LIGHT IN THE AFTERNOON. HIGH 26. HUMIDEX 32. UV INDEX 7 OR  
 HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. LOW 20.  
  
COBOURG - COLBORNE - WESTERN NORTHUMBERLAND COUNTY.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 14.  
SUNDAY..SUNNY. INCREASING CLOUDINESS NEAR NOON THEN 60 PERCENT CHANCE  
 OF SHOWERS LATE IN THE AFTERNOON. RISK OF A THUNDERSTORM LATE IN THE  
 AFTERNOON. FOG PATCHES DISSIPATING IN THE MORNING. WIND BECOMING  
 SOUTH 20 KM/H LATE IN THE AFTERNOON. HIGH 26. HUMIDEX 33. UV INDEX 8  
 OR VERY HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. WIND SOUTH 20 KM/H BECOMING LIGHT IN THE EVENING.  
 LOW 20.  
  
BELLEVILLE - QUINTE WEST - EASTERN NORTHUMBERLAND COUNTY.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 12.  
SUNDAY..SUNNY. INCREASING CLOUDINESS NEAR NOON THEN 60 PERCENT CHANCE  
 OF SHOWERS LATE IN THE AFTERNOON. RISK OF A THUNDERSTORM LATE IN THE  
 AFTERNOON. FOG PATCHES DISSIPATING IN THE MORNING. WIND BECOMING  
 SOUTH 20 KM/H LATE IN THE AFTERNOON. HIGH 25. HUMIDEX 32. UV INDEX 8  
 OR VERY HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. WIND SOUTH 20 KM/H BECOMING LIGHT IN THE EVENING.  
 LOW 20.  
  
PICTON - SANDBANKS PARK.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 12.  
SUNDAY..SUNNY. INCREASING CLOUDINESS NEAR NOON THEN 60 PERCENT CHANCE  
 OF SHOWERS LATE IN THE AFTERNOON. RISK OF A THUNDERSTORM LATE IN THE  
 AFTERNOON. FOG PATCHES DISSIPATING IN THE MORNING. WIND BECOMING  
 SOUTH 20 KM/H LATE IN THE AFTERNOON. HIGH 25. HUMIDEX 32. UV INDEX 8  
 OR VERY HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. WIND SOUTH 20 KM/H BECOMING LIGHT IN THE EVENING.  
 LOW 20.  
  
NAPANEE - CONSECON.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 12.  
SUNDAY..SUNNY. INCREASING CLOUDINESS NEAR NOON THEN 60 PERCENT CHANCE  
 OF SHOWERS LATE IN THE AFTERNOON. RISK OF A THUNDERSTORM LATE IN THE  
 AFTERNOON. FOG PATCHES DISSIPATING IN THE MORNING. WIND BECOMING  
 SOUTH 20 KM/H LATE IN THE AFTERNOON. HIGH 25. HUMIDEX 32. UV INDEX 8  
 OR VERY HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. WIND SOUTH 20 KM/H BECOMING LIGHT IN THE EVENING.  
 LOW 20.  
  
KINGSTON - ODESSA - FRONTENAC ISLANDS.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 12.  
SUNDAY..SUNNY. INCREASING CLOUDINESS IN THE AFTERNOON THEN 60 PERCENT  
 CHANCE OF SHOWERS LATE IN THE AFTERNOON. RISK OF A THUNDERSTORM LATE  
 IN THE AFTERNOON. FOG PATCHES DISSIPATING IN THE MORNING. WIND  
 BECOMING SOUTH 20 KM/H GUSTING TO 40 LATE IN THE AFTERNOON. HIGH 25.  
 HUMIDEX 32. UV INDEX 8 OR VERY HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. WIND SOUTH 30 KM/H GUSTING TO 50 BECOMING LIGHT AFTER  
 MIDNIGHT. WIND BECOMING NORTH 20 BEFORE MORNING. LOW 20.  
  
LINDSAY - SOUTHERN KAWARTHA LAKES.  
TONIGHT..CLEAR. LOW 13.  
SUNDAY..INCREASING CLOUDINESS EARLY IN THE MORNING. 60 PERCENT CHANCE  
 OF SHOWERS LATE IN THE AFTERNOON WITH RISK OF A THUNDERSTORM. WIND  
 SOUTHEAST 20 KM/H BECOMING LIGHT IN THE AFTERNOON. HIGH 26. HUMIDEX  
 33. UV INDEX 7 OR HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. LOW 20.  
  
PETERBOROUGH CITY - LAKEFIELD - SOUTHERN PETERBOROUGH COUNTY.  
TONIGHT..CLEAR. LOW 10.  
SUNDAY..INCREASING CLOUDINESS EARLY IN THE MORNING. 60 PERCENT CHANCE  
 OF SHOWERS LATE IN THE AFTERNOON WITH RISK OF A THUNDERSTORM. WIND  
 SOUTHEAST 20 KM/H BECOMING LIGHT LATE IN THE MORNING. HIGH 25.  
 HUMIDEX 31. UV INDEX 7 OR HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. RISK OF A  
 THUNDERSTORM IN THE EVENING. LOW 19.  
  
STIRLING - TWEED - MADOC.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 11.  
SUNDAY..SUNNY. INCREASING CLOUDINESS NEAR NOON. FOG PATCHES  
 DISSIPATING IN THE MORNING. HIGH 25. HUMIDEX 32. UV INDEX 8 OR VERY  
 HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. LOW 18.  
  
TAMWORTH - SYDENHAM - SOUTH FRONTENAC.  
TONIGHT..CLEAR. FOG PATCHES DEVELOPING AFTER MIDNIGHT. LOW 11.  
SUNDAY..SUNNY. INCREASING CLOUDINESS IN THE AFTERNOON. FOG PATCHES  
 DISSIPATING IN THE MORNING. WIND BECOMING SOUTHWEST 20 KM/H GUSTING  
 TO 40 LATE IN THE MORNING. HIGH 25. HUMIDEX 32. UV INDEX 8 OR VERY  
 HIGH.  
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS AND RISK OF A  
 THUNDERSTORM. WIND SOUTHWEST 20 KM/H GUSTING TO 40 BECOMING LIGHT  
 NEAR MIDNIGHT. LOW 18.  
  
REMAINDER UNCHANGED.  
  
END  
 
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