066
FPCN11 CWTO 232305
FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL REGION ISSUED
BY ENVIRONMENT CANADA AT 3:30 P.M. EDT SATURDAY 23 MAY 2026 FOR
TONIGHT SUNDAY AND SUNDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT SUNDAY.
CITY OF TORONTO
MISSISSAUGA - BRAMPTON
VAUGHAN - RICHMOND HILL - MARKHAM.
TONIGHT..SHOWERS BECOMING MIXED WITH PERIODS OF DRIZZLE BEFORE
MORNING. AMOUNT 10 TO 15 MM. WIND SOUTHEAST 40 KM/H GUSTING TO 60.
TEMPERATURE STEADY NEAR 10.
SUNDAY..A FEW SHOWERS OR PERIODS OF DRIZZLE ENDING NEAR NOON THEN A
MIX OF SUN AND CLOUD. HIGH 19. UV INDEX 8 OR VERY HIGH.
SUNDAY NIGHT..INCREASING CLOUDINESS EARLY IN THE EVENING. 60 PERCENT
CHANCE OF SHOWERS LATE IN THE EVENING AND OVERNIGHT. LOW 11.
WINDSOR - LEAMINGTON - ESSEX COUNTY.
TONIGHT..CLOUDY. 40 PERCENT CHANCE OF SHOWERS OR DRIZZLE THIS
EVENING. BECOMING PARTLY CLOUDY AFTER MIDNIGHT. FOG PATCHES
DEVELOPING NEAR MIDNIGHT. WIND SOUTHEAST 30 KM/H BECOMING LIGHT
EARLY THIS EVENING. LOW 14.
SUNDAY..A MIX OF SUN AND CLOUD. BECOMING CLOUDY LATE IN THE MORNING.
60 PERCENT CHANCE OF SHOWERS LATE IN THE AFTERNOON. RISK OF A
THUNDERSTORM LATE IN THE AFTERNOON. HIGH 22. HUMIDEX 28. UV INDEX 6
OR HIGH.
SUNDAY NIGHT..A FEW SHOWERS ENDING NEAR MIDNIGHT THEN CLOUDY. RISK OF
A THUNDERSTORM EARLY IN THE EVENING. FOG PATCHES DEVELOPING NEAR
MIDNIGHT. LOW 14.
CHATHAM-KENT - RONDEAU PARK.
TONIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS OR DRIZZLE THIS
EVENING AND AFTER MIDNIGHT THEN PARTLY CLOUDY. FOG PATCHES
DEVELOPING NEAR MIDNIGHT. WIND SOUTHEAST 30 KM/H BECOMING LIGHT
EARLY THIS EVENING. LOW 14.
SUNDAY..A MIX OF SUN AND CLOUD. BECOMING CLOUDY LATE IN THE MORNING.
40 PERCENT CHANCE OF SHOWERS LATE IN THE AFTERNOON. RISK OF A
THUNDERSTORM LATE IN THE AFTERNOON. HIGH 22. HUMIDEX 28. UV INDEX 6
OR HIGH.
SUNDAY NIGHT..A FEW SHOWERS ENDING NEAR MIDNIGHT THEN CLOUDY. RISK OF
A THUNDERSTORM EARLY IN THE EVENING. FOG PATCHES DEVELOPING NEAR
MIDNIGHT. LOW 14.
SARNIA - LAMBTON.
TONIGHT..CLOUDY. 60 PERCENT CHANCE OF SHOWERS OR DRIZZLE THIS EVENING
AND AFTER MIDNIGHT. FOG PATCHES DEVELOPING NEAR MIDNIGHT. WIND
SOUTHEAST 30 KM/H. TEMPERATURE STEADY NEAR 13.
SUNDAY..BECOMING A MIX OF SUN AND CLOUD IN THE MORNING. 40 PERCENT
CHANCE OF SHOWERS LATE IN THE AFTERNOON. RISK OF A THUNDERSTORM LATE
IN THE AFTERNOON. WIND BECOMING SOUTHWEST 20 KM/H IN THE AFTERNOON.
HIGH 24. HUMIDEX 30. UV INDEX 7 OR HIGH.
SUNDAY NIGHT..A FEW SHOWERS ENDING NEAR MIDNIGHT THEN CLOUDY. RISK OF
A THUNDERSTORM EARLY IN THE EVENING. FOG PATCHES DEVELOPING NEAR
MIDNIGHT. WIND BECOMING SOUTHEAST 20 KM/H NEAR MIDNIGHT THEN
SOUTHWEST 30 BEFORE MORNING. LOW 15.
ELGIN
LONDON - MIDDLESEX.
TONIGHT..PERIODS OF RAIN OR DRIZZLE ENDING BEFORE MORNING THEN
CLOUDY. FOG PATCHES DEVELOPING NEAR MIDNIGHT. WIND SOUTHEAST
30 KM/H. TEMPERATURE STEADY NEAR 13.
SUNDAY..CLEARING LATE IN THE MORNING. WIND BECOMING SOUTHWEST 20 KM/H
IN THE AFTERNOON. HIGH 24. HUMIDEX 30. UV INDEX 7 OR HIGH.
SUNDAY NIGHT..INCREASING CLOUDINESS. SHOWERS BEGINNING IN THE EVENING
AND ENDING OVERNIGHT. RISK OF A THUNDERSTORM IN THE EVENING. FOG
PATCHES DEVELOPING NEAR MIDNIGHT. WIND BECOMING SOUTHEAST 20 KM/H
NEAR MIDNIGHT THEN SOUTHWEST 30 BEFORE MORNING. LOW 15.
SIMCOE - DELHI - NORFOLK
DUNNVILLE - CALEDONIA - HALDIMAND
OXFORD - BRANT.
TONIGHT..SHOWERS OR DRIZZLE. WIND SOUTHEAST 30 KM/H BECOMING LIGHT
AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 11.
SUNDAY..CLEARING LATE IN THE MORNING. HIGH 25. HUMIDEX 30. UV INDEX 7
OR HIGH.
SUNDAY NIGHT..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS. FOG
PATCHES DEVELOPING NEAR MIDNIGHT. LOW 12.
NIAGARA.
TONIGHT..RAIN. AMOUNT 10 TO 15 MM. WIND SOUTHEAST 30 KM/H BECOMING
LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 11.
SUNDAY..RAIN OR DRIZZLE ENDING IN THE MORNING THEN CLEARING. HIGH 25.
HUMIDEX 30. UV INDEX 7 OR HIGH.
SUNDAY NIGHT..CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. LOW 12.
CITY OF HAMILTON
BURLINGTON - OAKVILLE
HALTON HILLS - MILTON.
TONIGHT..PERIODS OF RAIN. WIND SOUTHEAST 30 KM/H BECOMING LIGHT AFTER
MIDNIGHT. TEMPERATURE STEADY NEAR 11.
SUNDAY..PERIODS OF RAIN OR DRIZZLE ENDING IN THE MORNING THEN
CLEARING. HIGH 25. HUMIDEX 30. UV INDEX 7 OR HIGH.
SUNDAY NIGHT..INCREASING CLOUDINESS. 60 PERCENT CHANCE OF SHOWERS
LATE IN THE EVENING AND OVERNIGHT. LOW 12.
CALEDON
MOUNT FOREST - ARTHUR - NORTHERN WELLINGTON COUNTY
ORANGEVILLE - GRAND VALLEY - SOUTHERN DUFFERIN COUNTY
SHELBURNE - MANSFIELD - NORTHERN DUFFERIN COUNTY.
TONIGHT..PERIODS OF RAIN BECOMING MIXED WITH DRIZZLE NEAR MIDNIGHT.
WIND SOUTHEAST 30 KM/H BECOMING LIGHT AFTER MIDNIGHT. TEMPERATURE
STEADY NEAR 11.
SUNDAY..CLOUDY WITH 60 PERCENT CHANCE OF DRIZZLE IN THE MORNING.
CLEARING NEAR NOON. HIGH 25. HUMIDEX 30. UV INDEX 7 OR HIGH.
SUNDAY NIGHT..MAINLY CLOUDY. SHOWERS BEGINNING IN THE EVENING AND
ENDING BEFORE MORNING. FOG PATCHES DEVELOPING NEAR MIDNIGHT. LOW 12.
NEWMARKET - GEORGINA - NORTHERN YORK REGION
UXBRIDGE - BEAVERTON - NORTHERN DURHAM REGION
INNISFIL - NEW TECUMSETH - ANGUS
LINDSAY - SOUTHERN KAWARTHA LAKES.
TONIGHT..RAIN. AMOUNT 10 TO 15 MM. WIND SOUTHEAST 40 KM/H GUSTING TO
60. TEMPERATURE STEADY NEAR 10.
SUNDAY..PERIODS OF RAIN OR DRIZZLE ENDING IN THE AFTERNOON THEN
CLEARING. HIGH 19. UV INDEX 5 OR MODERATE.
SUNDAY NIGHT..INCREASING CLOUDINESS. SHOWERS BEGINNING IN THE
EVENING. LOW 11.
PICKERING - OSHAWA - SOUTHERN DURHAM REGION
COBOURG - COLBORNE - WESTERN NORTHUMBERLAND COUNTY.
TONIGHT..RAIN. AMOUNT 20 TO 30 MM. WIND SOUTHEAST 40 KM/H GUSTING TO
60. TEMPERATURE STEADY NEAR 10.
SUNDAY..PERIODS OF RAIN OR DRIZZLE ENDING IN THE AFTERNOON THEN
CLEARING. HIGH 19. UV INDEX 5 OR MODERATE.
SUNDAY NIGHT..INCREASING CLOUDINESS. 60 PERCENT CHANCE OF SHOWERS
LATE IN THE EVENING AND OVERNIGHT. LOW 11.
GODERICH - BLUEWATER - SOUTHERN HURON COUNTY
STRATFORD - MITCHELL - SOUTHERN PERTH COUNTY.
TONIGHT..RAIN OR DRIZZLE. FOG PATCHES DEVELOPING NEAR MIDNIGHT. WIND
SOUTHEAST 30 KM/H BECOMING LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY
NEAR 11.
SUNDAY..CLEARING LATE IN THE MORNING. HIGH 25. HUMIDEX 30. UV INDEX 7
OR HIGH.
SUNDAY NIGHT..A FEW SHOWERS ENDING AFTER MIDNIGHT THEN CLOUDY. FOG
PATCHES DEVELOPING NEAR MIDNIGHT. LOW 12.
WINGHAM - BLYTH - NORTHERN HURON COUNTY
LISTOWEL - MILVERTON - NORTHERN PERTH COUNTY.
TONIGHT..PERIODS OF RAIN OR DRIZZLE. FOG PATCHES DEVELOPING NEAR
MIDNIGHT. WIND SOUTHEAST 30 KM/H BECOMING LIGHT AFTER MIDNIGHT.
TEMPERATURE STEADY NEAR 11.
SUNDAY..CLOUDY WITH 60 PERCENT CHANCE OF DRIZZLE EARLY IN THE
MORNING. CLEARING LATE IN THE MORNING. HIGH 25. HUMIDEX 30. UV
INDEX 7 OR HIGH.
SUNDAY NIGHT..A FEW SHOWERS ENDING AFTER MIDNIGHT THEN CLOUDY. FOG
PATCHES DEVELOPING NEAR MIDNIGHT. LOW 12.
KITCHENER - CAMBRIDGE - REGION OF WATERLOO
GUELPH - ERIN - SOUTHERN WELLINGTON COUNTY.
TONIGHT..RAIN BECOMING MIXED WITH DRIZZLE NEAR MIDNIGHT. WIND
SOUTHEAST 30 KM/H BECOMING LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY
NEAR 11.
SUNDAY..CLOUDY WITH 60 PERCENT CHANCE OF DRIZZLE IN THE MORNING.
CLEARING NEAR NOON. HIGH 25. HUMIDEX 30. UV INDEX 7 OR HIGH.
SUNDAY NIGHT..INCREASING CLOUDINESS EARLY IN THE EVENING. 60 PERCENT
CHANCE OF SHOWERS LATE IN THE EVENING AND OVERNIGHT. FOG PATCHES
DEVELOPING NEAR MIDNIGHT. LOW 12.
SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
HANOVER - DUNDALK - SOUTHERN GREY COUNTY.
TONIGHT..PERIODS OF RAIN ENDING BEFORE MORNING THEN CLOUDY WITH
60 PERCENT CHANCE OF DRIZZLE. FOG PATCHES DEVELOPING NEAR MIDNIGHT.
WIND SOUTHEAST 40 KM/H GUSTING TO 60. TEMPERATURE STEADY NEAR 10.
SUNDAY..CLOUDY. 60 PERCENT CHANCE OF DRIZZLE EARLY IN THE MORNING.
BECOMING A MIX OF SUN AND CLOUD LATE IN THE MORNING. HIGH 19. UV
INDEX 8 OR VERY HIGH.
SUNDAY NIGHT..SHOWERS ENDING OVERNIGHT THEN CLOUDY WITH 40 PERCENT
CHANCE OF SHOWERS OR DRIZZLE. FOG PATCHES DEVELOPING NEAR MIDNIGHT.
LOW 11.
BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY
OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY.
TONIGHT..PERIODS OF RAIN. FOG PATCHES DEVELOPING NEAR MIDNIGHT. WIND
SOUTHEAST 40 KM/H GUSTING TO 60. TEMPERATURE STEADY NEAR 10.
SUNDAY..CLOUDY WITH 60 PERCENT CHANCE OF RAIN OR DRIZZLE IN THE
MORNING THEN A MIX OF SUN AND CLOUD. HIGH 19. UV INDEX 8 OR VERY
HIGH.
SUNDAY NIGHT..SHOWERS ENDING OVERNIGHT THEN CLOUDY WITH 40 PERCENT
CHANCE OF SHOWERS OR DRIZZLE. FOG PATCHES DEVELOPING OVERNIGHT.
LOW 11.
BARRIE - ORILLIA - MIDLAND.
TONIGHT..RAIN. WIND SOUTHEAST 30 KM/H BECOMING LIGHT AFTER MIDNIGHT.
TEMPERATURE STEADY NEAR 9.
SUNDAY..PERIODS OF RAIN OR DRIZZLE ENDING IN THE AFTERNOON THEN A MIX
OF SUN AND CLOUD. HIGH 20. UV INDEX 5 OR MODERATE.
SUNDAY NIGHT..CLOUDY. A FEW SHOWERS BEGINNING IN THE EVENING AND
ENDING BEFORE MORNING. FOG PATCHES DEVELOPING OVERNIGHT. LOW 13.
BELLEVILLE - QUINTE WEST - EASTERN NORTHUMBERLAND COUNTY
PICTON - SANDBANKS PARK
NAPANEE - CONSECON.
TONIGHT..RAIN. AMOUNT 30 TO 40 MM. WIND SOUTHEAST 30 KM/H BECOMING
LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 9.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. AMOUNT 5 MM. HIGH 20. UV
INDEX 3 OR MODERATE.
SUNDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 13.
KINGSTON - ODESSA - FRONTENAC ISLANDS
TAMWORTH - SYDENHAM - SOUTH FRONTENAC
GANANOQUE - MALLORYTOWN
WESTPORT - CHARLESTON LAKE.
TONIGHT..RAIN. AMOUNT 20 TO 30 MM. WIND SOUTHEAST 30 KM/H BECOMING
LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 9.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. AMOUNT 5 MM. HIGH 20. UV
INDEX 3 OR MODERATE.
SUNDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 13.
FENELON FALLS - BALSAM LAKE PARK - NORTHERN KAWARTHA LAKES
APSLEY - WOODVIEW - NORTHERN PETERBOROUGH COUNTY.
TONIGHT..RAIN. AMOUNT 10 TO 20 MM. WIND SOUTHEAST 30 KM/H BECOMING
LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 9.
SUNDAY..PERIODS OF RAIN OR DRIZZLE. HIGH 20. UV INDEX 2 OR LOW.
SUNDAY NIGHT..SHOWERS. LOW 13.
PETERBOROUGH CITY - LAKEFIELD - SOUTHERN PETERBOROUGH COUNTY
STIRLING - TWEED - MADOC.
TONIGHT..RAIN. AMOUNT 20 TO 30 MM. WIND SOUTHEAST 30 KM/H BECOMING
LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 9.
SUNDAY..PERIODS OF RAIN OR DRIZZLE. AMOUNT 5 MM. HIGH 20. UV INDEX 2
OR LOW.
SUNDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 13.
BANCROFT - BON ECHO PARK
PLEVNA - SHARBOT LAKE - WESTERN LANARK COUNTY.
TONIGHT..RAIN. AMOUNT 10 TO 20 MM. WIND SOUTHEAST 30 KM/H BECOMING
LIGHT AFTER MIDNIGHT. TEMPERATURE STEADY NEAR 9.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. AMOUNT 5 MM. HIGH 20. UV
INDEX 3 OR MODERATE.
SUNDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 13.
BROCKVILLE - PRESCOTT
MERRICKVILLE-WOLFORD - KEMPTVILLE
CITY OF OTTAWA
GATINEAU
SMITHS FALLS - PERTH - EASTERN LANARK COUNTY.
TONIGHT..CLOUDY. RAIN BEGINNING NEAR MIDNIGHT. AMOUNT 5 TO 10 MM.
WIND SOUTHEAST 20 KM/H BECOMING LIGHT AFTER MIDNIGHT. LOW 7.
SUNDAY..SHOWERS. AMOUNT 5 TO 10 MM. HIGH 14. UV INDEX 3 OR MODERATE.
SUNDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 10.
PRESCOTT AND RUSSELL
CORNWALL - MORRISBURG.
TONIGHT..CLOUDY. PERIODS OF RAIN BEGINNING NEAR MIDNIGHT. WIND
SOUTHEAST 20 KM/H BECOMING LIGHT AFTER MIDNIGHT. LOW 7.
SUNDAY..SHOWERS. AMOUNT 10 TO 15 MM. HIGH 14. UV INDEX 3 OR MODERATE.
SUNDAY NIGHT..CLOUDY WITH 40 PERCENT CHANCE OF SHOWERS. LOW 10.
PORT CARLING - PORT SEVERN
BRACEBRIDGE - GRAVENHURST
HALIBURTON - MINDEN - SOUTHERN HALIBURTON COUNTY.
TONIGHT..RAIN. WIND SOUTHEAST 30 KM/H BECOMING LIGHT AFTER MIDNIGHT.
TEMPERATURE STEADY NEAR 9.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. HIGH 20. UV INDEX 3 OR
MODERATE.
SUNDAY NIGHT..SHOWERS. SHOWERS OR PERIODS OF DRIZZLE EARLY IN THE
EVENING. FOG PATCHES DEVELOPING OVERNIGHT. LOW 13.
TOWN OF PARRY SOUND - ROSSEAU - KILLBEAR PARK
HUNTSVILLE - BAYSVILLE
OXTONGUE LAKE - FORT IRWIN - NORTHERN HALIBURTON COUNTY
WESTERN ALGONQUIN PARK - LAKE OF TWO RIVERS
BURK'S FALLS - BAYFIELD INLET.
TONIGHT..CLOUDY. PERIODS OF RAIN BEGINNING EARLY THIS EVENING. WIND
SOUTHEAST 30 KM/H BECOMING LIGHT LATE THIS EVENING. TEMPERATURE
STEADY NEAR 9.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. HIGH 15. UV INDEX 3 OR
MODERATE.
SUNDAY NIGHT..SHOWERS. SHOWERS OR PERIODS OF DRIZZLE EARLY IN THE
EVENING. FOG PATCHES DEVELOPING OVERNIGHT. LOW 8.
RENFREW - PEMBROKE - BARRY'S BAY.
TONIGHT..CLOUDY. PERIODS OF RAIN BEGINNING THIS EVENING. AMOUNT 10 TO
15 MM. WIND SOUTHEAST 20 KM/H BECOMING LIGHT AFTER MIDNIGHT. LOW 7.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. HIGH 14. UV INDEX 3 OR
MODERATE.
SUNDAY NIGHT..A FEW SHOWERS OR PERIODS OF DRIZZLE ENDING NEAR
MIDNIGHT THEN CLOUDY WITH 60 PERCENT CHANCE OF SHOWERS. LOW 10.
DEEP RIVER - WHITNEY - EASTERN ALGONQUIN PARK.
TONIGHT..CLOUDY. PERIODS OF RAIN BEGINNING THIS EVENING. WIND
SOUTHEAST 20 KM/H BECOMING LIGHT AFTER MIDNIGHT. LOW 7.
SUNDAY..SHOWERS OR PERIODS OF DRIZZLE. HIGH 14. UV INDEX 3 OR
MODERATE.
SUNDAY NIGHT..SHOWERS. SHOWERS OR PERIODS OF DRIZZLE IN THE EVENING.
LOW 10.
END
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