FPCN11 CWTO 192242 AAA UPDATED FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL REGION ISSUED BY ENVIRONMENT CANADA AT 6:42 P.M. EDT SUNDAY 19 APRIL 2026 FOR TONIGHT MONDAY AND MONDAY NIGHT. THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT MONDAY. WINDSOR - LEAMINGTON - ESSEX COUNTY. TONIGHT..PARTLY CLOUDY. 60 PERCENT CHANCE OF RAIN SHOWERS OR FLURRIES EARLY THIS EVENING. CLEARING OVERNIGHT. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 2. WIND CHILL MINUS 8 OVERNIGHT. MONDAY..A MIX OF SUN AND CLOUD WITH 40 PERCENT CHANCE OF FLURRIES IN THE MORNING. BECOMING SUNNY IN THE AFTERNOON. WIND BECOMING NORTHWEST 20 KM/H IN THE AFTERNOON. HIGH 7. WIND CHILL MINUS 6 IN THE MORNING. UV INDEX 5 OR MODERATE. MONDAY NIGHT..CLEAR. LOW ZERO. CHATHAM-KENT - RONDEAU PARK. TONIGHT..A FEW RAIN SHOWERS AND FLURRIES ENDING THIS EVENING THEN PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTH 30 KM/H GUSTING TO 50. LOW MINUS 2. WIND CHILL MINUS 8 OVERNIGHT. MONDAY..A MIX OF SUN AND CLOUD. 60 PERCENT CHANCE OF FLURRIES IN THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT LATE IN THE MORNING. HIGH 7. WIND CHILL MINUS 8 IN THE MORNING. UV INDEX 5 OR MODERATE. MONDAY NIGHT..CLEAR. LOW ZERO. SARNIA - PETROLIA - WESTERN LAMBTON COUNTY. TONIGHT..A FEW RAIN SHOWERS AND FLURRIES ENDING THIS EVENING THEN PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTH 30 KM/H GUSTING TO 50. LOW MINUS 3. WIND CHILL MINUS 10 OVERNIGHT. MONDAY..A MIX OF SUN AND CLOUD. 60 PERCENT CHANCE OF FLURRIES IN THE MORNING. WIND NORTHWEST 30 KM/H BECOMING LIGHT LATE IN THE MORNING. HIGH PLUS 4. WIND CHILL MINUS 10 IN THE MORNING. UV INDEX 5 OR MODERATE. MONDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY OVERNIGHT. WIND BECOMING SOUTH 20 KM/H NEAR MIDNIGHT. LOW MINUS 4. WIND CHILL MINUS 10 OVERNIGHT. CALEDON. TONIGHT..PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 5. WIND CHILL NEAR MINUS 11. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. WIND NORTH 20 KM/H. HIGH PLUS 3. WIND CHILL MINUS 12 IN THE MORNING. UV INDEX 4 OR MODERATE. MONDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY BEFORE MORNING. WIND BECOMING SOUTHWEST 20 KM/H AFTER MIDNIGHT. LOW MINUS 7. WIND CHILL MINUS 14 OVERNIGHT. GODERICH - BLUEWATER - SOUTHERN HURON COUNTY. TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTH 30 KM/H GUSTING TO 50. LOW MINUS 2. WIND CHILL MINUS 9 OVERNIGHT. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. CLEARING LATE IN THE AFTERNOON. WIND NORTH 30 KM/H BECOMING LIGHT IN THE AFTERNOON. HIGH PLUS 2. WIND CHILL MINUS 9 IN THE MORNING. UV INDEX 4 OR MODERATE. MONDAY NIGHT..CLEAR. INCREASING CLOUDINESS AFTER MIDNIGHT. WIND BECOMING SOUTH 30 KM/H IN THE EVENING. LOW MINUS 3. WIND CHILL MINUS 10 OVERNIGHT. WINGHAM - BLYTH - NORTHERN HURON COUNTY. TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTH 30 KM/H GUSTING TO 50. LOW MINUS 4. WIND CHILL MINUS 12 OVERNIGHT. MONDAY..CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. CLEARING LATE IN THE AFTERNOON. WIND NORTHWEST 20 KM/H BECOMING LIGHT LATE IN THE MORNING. HIGH PLUS 3. WIND CHILL MINUS 10 IN THE MORNING. UV INDEX 4 OR MODERATE. MONDAY NIGHT..CLEAR. INCREASING CLOUDINESS AFTER MIDNIGHT. WIND UP TO 15 KM/H. LOW MINUS 7. WIND CHILL MINUS 13 OVERNIGHT. STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY. TONIGHT..PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 4. WIND CHILL NEAR MINUS 11. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE AFTERNOON. HIGH PLUS 3. WIND CHILL MINUS 10 IN THE MORNING. UV INDEX 3 OR MODERATE. MONDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY OVERNIGHT. WIND UP TO 15 KM/H. LOW MINUS 7. WIND CHILL MINUS 13 OVERNIGHT. LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY. TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 4. WIND CHILL NEAR MINUS 11. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT LATE IN THE MORNING. HIGH PLUS 3. WIND CHILL MINUS 10 IN THE MORNING. UV INDEX 3 OR MODERATE. MONDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY OVERNIGHT. WIND UP TO 15 KM/H. LOW MINUS 7. WIND CHILL MINUS 12 OVERNIGHT. KITCHENER - CAMBRIDGE - REGION OF WATERLOO. TONIGHT..PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES OR RAIN SHOWERS. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 5. WIND CHILL MINUS 12 OVERNIGHT. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE AFTERNOON. HIGH PLUS 3. WIND CHILL MINUS 9 IN THE MORNING. UV INDEX 3 OR MODERATE. MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 8. WIND CHILL MINUS 13 OVERNIGHT. GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY. TONIGHT..PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES OR RAIN SHOWERS. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 5. WIND CHILL MINUS 12 OVERNIGHT. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. WIND NORTHWEST 20 KM/H BECOMING LIGHT IN THE AFTERNOON. HIGH PLUS 3. WIND CHILL MINUS 11 IN THE MORNING. UV INDEX 3 OR MODERATE. MONDAY NIGHT..CLEAR. WIND UP TO 15 KM/H. LOW MINUS 8. WIND CHILL MINUS 13 OVERNIGHT. MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY. TONIGHT..MAINLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 4. WIND CHILL NEAR MINUS 12. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. CLEARING LATE IN THE AFTERNOON. WIND NORTHWEST 20 KM/H BECOMING LIGHT LATE IN THE MORNING. HIGH MINUS 1. WIND CHILL NEAR MINUS 9. UV INDEX 3 OR MODERATE. MONDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY OVERNIGHT. WIND UP TO 15 KM/H. LOW MINUS 5. WIND CHILL MINUS 9 IN THE EVENING. ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY. TONIGHT..PARTLY CLOUDY WITH 60 PERCENT CHANCE OF FLURRIES. WIND NORTHWEST 30 KM/H GUSTING TO 50. LOW MINUS 5. WIND CHILL NEAR MINUS 11. MONDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF FLURRIES EARLY IN THE MORNING. WIND NORTHWEST 20 KM/H. HIGH PLUS 3. WIND CHILL MINUS 11 IN THE MORNING. UV INDEX 4 OR MODERATE. MONDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY BEFORE MORNING. WIND UP TO 15 KM/H. LOW MINUS 7. WIND CHILL MINUS 12 OVERNIGHT. REMAINDER UNCHANGED. END