842
FPCN11 CWTO 110736 AAE
UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL
REGION ISSUED BY ENVIRONMENT CANADA AT 3:35 A.M. EDT MONDAY 11 MAY
2026 FOR TONIGHT MONDAY AND MONDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT.
CITY OF TORONTO.
TONIGHT..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 3.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND NORTHWEST 20 KM/H BECOMING SOUTH 20 GUSTING TO 40
LATE IN THE MORNING THEN LIGHT IN THE AFTERNOON. HIGH 13. UV INDEX 6
OR HIGH.
MONDAY NIGHT..PARTLY CLOUDY. BECOMING CLEAR IN THE EVENING. WIND
NORTH 20 KM/H BECOMING LIGHT AFTER MIDNIGHT. LOW PLUS 1 WITH RISK OF
FROST.
SIMCOE - DELHI - NORFOLK.
TONIGHT..PARTLY CLOUDY. LOW PLUS 2 WITH RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. BECOMING SUNNY IN THE AFTERNOON. WIND
BECOMING NORTHWEST 20 KM/H LATE IN THE MORNING. HIGH 13. UV INDEX 6
OR HIGH.
MONDAY NIGHT..CLEAR. LOW MINUS 1 WITH PATCHY FROST.
DUNNVILLE - CALEDONIA - HALDIMAND.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
LOW PLUS 2 WITH RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40 LATE IN
THE MORNING. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..PARTLY CLOUDY. BECOMING CLEAR IN THE EVENING. LOW
MINUS 1 WITH PATCHY FROST.
WOODSTOCK - TILLSONBURG - OXFORD COUNTY.
TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 1
WITH PATCHY FROST.
MONDAY..CLEARING IN THE MORNING. WIND BECOMING NORTHWEST 20 KM/H LATE
IN THE MORNING. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 2 WITH FROST. WIND
CHILL MINUS 5 OVERNIGHT.
BRANTFORD - COUNTY OF BRANT.
TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 1
WITH PATCHY FROST.
MONDAY..MAINLY SUNNY. WIND BECOMING NORTHWEST 20 KM/H GUSTING TO 40
LATE IN THE MORNING. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 2 WITH FROST. WIND
CHILL MINUS 5 OVERNIGHT.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TONIGHT..PARTLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
LOW PLUS 3 WITH RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING LATE IN THE EVENING. LOW PLUS 1 WITH RISK OF
FROST.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TONIGHT..MAINLY CLOUDY. 30 PERCENT CHANCE OF SHOWERS BEFORE MORNING.
LOW PLUS 3 WITH RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING. LOW PLUS 1 WITH RISK OF FROST.
CITY OF HAMILTON.
TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 2
WITH RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. WIND BECOMING NORTHWEST 20 KM/H LATE
IN THE MORNING. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING. LOW PLUS 1 WITH RISK OF FROST.
BURLINGTON - OAKVILLE.
TONIGHT..CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 2 WITH
RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND SOUTHEAST 20 KM/H BECOMING LIGHT LATE IN THE
MORNING. HIGH 12. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING. WIND NORTH 20 KM/H BECOMING LIGHT NEAR
MIDNIGHT. LOW PLUS 1 WITH RISK OF FROST.
HALTON HILLS - MILTON.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 1
WITH PATCHY FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE AFTERNOON.
HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING LATE IN THE EVENING. LOW MINUS 1 WITH FROST.
MISSISSAUGA - BRAMPTON.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 2
WITH PATCHY FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND NORTH 20 KM/H BECOMING LIGHT IN THE AFTERNOON.
HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING LATE IN THE EVENING. LOW ZERO WITH PATCHY
FROST.
CALEDON.
TONIGHT..MAINLY CLOUDY. LOW ZERO WITH PATCHY FROST.
MONDAY..A MIX OF SUN AND CLOUD. WIND NORTHWEST 20 KM/H BECOMING LIGHT
IN THE AFTERNOON. HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. LOW MINUS 1 WITH FROST.
VAUGHAN - RICHMOND HILL - MARKHAM.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 1
WITH PATCHY FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE AFTERNOON.
HIGH 13. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. LOW ZERO WITH PATCHY FROST.
NEWMARKET - GEORGINA - NORTHERN YORK REGION.
TONIGHT..MAINLY CLOUDY. LOW PLUS 1 WITH PATCHY FROST.
MONDAY..MAINLY SUNNY. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE
AFTERNOON. HIGH 11. UV INDEX 5 OR MODERATE.
MONDAY NIGHT..CLEAR. LOW MINUS 1 WITH FROST.
PICKERING - OSHAWA - SOUTHERN DURHAM REGION.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW PLUS 2
WITH RISK OF FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND BECOMING NORTHWEST 20 KM/H IN THE MORNING.
HIGH 12. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND NORTH 20 KM/H BECOMING LIGHT IN THE
EVENING. LOW ZERO WITH PATCHY FROST.
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.
TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW ZERO
WITH FROST.
MONDAY..A MIX OF SUN AND CLOUD WITH 30 PERCENT CHANCE OF SHOWERS
EARLY IN THE MORNING. OTHERWISE SUNNY. WIND NORTHWEST 20 KM/H
BECOMING LIGHT IN THE AFTERNOON. HIGH 11. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 3 WITH FROST. WIND
CHILL MINUS 7 OVERNIGHT.
LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY.
TONIGHT..PARTLY CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW MINUS 1
WITH FROST.
MONDAY..A MIX OF SUN AND CLOUD WITH 40 PERCENT CHANCE OF SHOWERS
EARLY IN THE MORNING. CLEARING IN THE MORNING. WIND NORTHWEST
20 KM/H BECOMING LIGHT IN THE AFTERNOON. HIGH 11. UV INDEX 6 OR
HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 3 WITH FROST. WIND
CHILL MINUS 7 OVERNIGHT.
KITCHENER - CAMBRIDGE - REGION OF WATERLOO.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW ZERO
WITH FROST.
MONDAY..MAINLY SUNNY. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE
AFTERNOON. HIGH 12. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 3 WITH FROST. WIND
CHILL MINUS 5 OVERNIGHT.
GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY.
TONIGHT..MAINLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW ZERO
WITH FROST.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND BECOMING NORTHWEST 20 KM/H IN THE MORNING.
HIGH 12. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEARING LATE IN THE EVENING. WIND UP TO 15 KM/H. LOW
MINUS 3 WITH FROST. WIND CHILL MINUS 6 OVERNIGHT.
MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY.
TONIGHT..PARTLY CLOUDY WITH 30 PERCENT CHANCE OF SHOWERS. LOW
MINUS 1.
MONDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY IN
THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT LATE IN THE
MORNING. HIGH 12. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 3. WIND CHILL
MINUS 7 OVERNIGHT.
ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY.
TONIGHT..MAINLY CLOUDY. LOW ZERO.
MONDAY..A MIX OF SUN AND CLOUD. WIND NORTHWEST 20 KM/H BECOMING LIGHT
LATE IN THE MORNING. HIGH 11. UV INDEX 6 OR HIGH.
MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 2. WIND CHILL
MINUS 4 OVERNIGHT.
REMAINDER UNCHANGED.
END
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