921
FPCN11 CWTO 071915
FORECASTS FOR SOUTHERN ONTARIO AND THE NATIONAL CAPITAL REGION ISSUED
BY ENVIRONMENT CANADA AT 3:30 P.M. EDT MONDAY 7 SEPTEMBER 2026 FOR
TONIGHT TUESDAY AND TUESDAY NIGHT.
THE NEXT SCHEDULED FORECAST WILL BE ISSUED AT 5:00 A.M. EDT TUESDAY.
CITY OF TORONTO.
TONIGHT..CLEAR. LOW 15.
TUESDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD LATE IN THE MORNING.
HIGH 25. HUMIDEX 28. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. BECOMING CLOUDY IN THE EVENING. LOW 19.
WINDSOR - ESSEX - CHATHAM-KENT.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. WIND EAST 20 KM/H
BECOMING LIGHT EARLY THIS EVENING. LOW 12.
TUESDAY..SUNNY. FOG PATCHES DISSIPATING IN THE MORNING. HIGH 30.
HUMIDEX 36. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..CLEAR. BECOMING PARTLY CLOUDY IN THE EVENING. LOW 20.
SARNIA - LAMBTON.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. LOW 12.
TUESDAY..SUNNY. FOG PATCHES DISSIPATING IN THE MORNING. HIGH 28.
HUMIDEX 33. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..INCREASING CLOUDINESS NEAR MIDNIGHT. WIND BECOMING
SOUTH 20 KM/H NEAR MIDNIGHT. LOW 20.
ELGIN.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. LOW 12.
TUESDAY..SUNNY. FOG PATCHES DISSIPATING IN THE MORNING. HIGH 26.
HUMIDEX 31. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..INCREASING CLOUDINESS NEAR MIDNIGHT. WIND BECOMING
SOUTHWEST 30 KM/H BEFORE MORNING. LOW 20 WITH TEMPERATURE RISING
TO 24 BY MORNING.
LONDON - MIDDLESEX.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. LOW 13.
TUESDAY..SUNNY. FOG PATCHES DISSIPATING IN THE MORNING. WIND BECOMING
SOUTH 20 KM/H LATE IN THE AFTERNOON. HIGH 27. HUMIDEX 32. UV INDEX 7
OR HIGH.
TUESDAY NIGHT..INCREASING CLOUDINESS NEAR MIDNIGHT. WIND SOUTHEAST
20 KM/H BECOMING LIGHT IN THE EVENING. LOW 19.
SIMCOE - DELHI - NORFOLK.
TONIGHT..CLEAR. LOW 9.
TUESDAY..SUNNY. HIGH 27. HUMIDEX 30. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..INCREASING CLOUDINESS NEAR MIDNIGHT. LOW 16 WITH
TEMPERATURE RISING TO 23 BY MORNING.
DUNNVILLE - CALEDONIA - HALDIMAND.
TONIGHT..CLEAR. LOW 10.
TUESDAY..SUNNY. HIGH 26. HUMIDEX 30. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. WIND BECOMING SOUTHWEST 20 KM/H BEFORE
MORNING. LOW 16 WITH TEMPERATURE RISING TO 24 BY MORNING.
OXFORD - BRANT.
TONIGHT..CLEAR. LOW 10.
TUESDAY..MAINLY SUNNY. HIGH 27. HUMIDEX 31. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. LOW 17.
NIAGARA FALLS - WELLAND - SOUTHERN NIAGARA REGION.
TONIGHT..CLEAR. LOW 17.
TUESDAY..SUNNY. HIGH 25. HUMIDEX 29. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. WIND BECOMING SOUTHWEST 20 KM/H AFTER
MIDNIGHT. TEMPERATURE STEADY NEAR 24.
ST. CATHARINES - GRIMSBY - NORTHERN NIAGARA REGION.
TONIGHT..CLEAR. LOW 12.
TUESDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD IN THE AFTERNOON.
HIGH 26. HUMIDEX 31. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. WIND BECOMING SOUTHWEST 20 KM/H BEFORE
MORNING. LOW 18.
CITY OF HAMILTON.
TONIGHT..CLEAR. LOW 12.
TUESDAY..SUNNY. HIGH 25. HUMIDEX 28. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. BECOMING CLOUDY AFTER MIDNIGHT. LOW 17
WITH TEMPERATURE RISING TO 22 BY MORNING.
HALTON - PEEL.
TONIGHT..CLEAR. LOW 12.
TUESDAY..SUNNY. INCREASING CLOUDINESS LATE IN THE AFTERNOON. HIGH 25.
HUMIDEX 28. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. BECOMING CLOUDY IN THE EVENING. LOW 16.
YORK - DURHAM.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. LOW 12.
TUESDAY..SUNNY. INCREASING CLOUDINESS IN THE AFTERNOON. FOG PATCHES
DISSIPATING IN THE MORNING. HIGH 25. HUMIDEX 29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..MAINLY CLOUDY. LOW 17.
HURON - PERTH.
TONIGHT..CLEAR. LOW 12.
TUESDAY..MAINLY SUNNY. WIND BECOMING SOUTHEAST 20 KM/H LATE IN THE
AFTERNOON. HIGH 27. HUMIDEX 34. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..INCREASING CLOUDINESS IN THE EVENING. LOW 18.
WATERLOO - WELLINGTON.
TONIGHT..CLEAR. LOW 11.
TUESDAY..MAINLY SUNNY. HIGH 25. HUMIDEX 28. UV INDEX 7 OR HIGH.
TUESDAY NIGHT..INCREASING CLOUDINESS IN THE EVENING. WIND BECOMING
SOUTHWEST 20 KM/H BEFORE MORNING. LOW 16.
DUFFERIN - INNISFIL.
TONIGHT..CLEAR. LOW 11.
TUESDAY..A MIX OF SUN AND CLOUD. HIGH 24. HUMIDEX 28. UV INDEX 6 OR
HIGH.
TUESDAY NIGHT..MAINLY CLOUDY. LOW 17.
SAUGEEN SHORES - KINCARDINE - SOUTHERN BRUCE COUNTY
BRUCE PENINSULA - SAUBLE BEACH - TOBERMORY.
TONIGHT..CLEAR. WIND BECOMING SOUTHEAST 20 KM/H AFTER MIDNIGHT.
LOW 14.
TUESDAY..SUNNY. BECOMING A MIX OF SUN AND CLOUD IN THE AFTERNOON.
HIGH 25. HUMIDEX 29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..BECOMING CLOUDY IN THE EVENING. 60 PERCENT CHANCE OF
SHOWERS OVERNIGHT. WIND BECOMING SOUTH 30 KM/H NEAR MIDNIGHT.
LOW 18.
HANOVER - DUNDALK - SOUTHERN GREY COUNTY
OWEN SOUND - BLUE MOUNTAINS - NORTHERN GREY COUNTY.
TONIGHT..CLEAR. LOW 11.
TUESDAY..INCREASING CLOUDINESS IN THE MORNING. WIND BECOMING SOUTH
20 KM/H LATE IN THE AFTERNOON. HIGH 24. HUMIDEX 29. UV INDEX 6 OR
HIGH.
TUESDAY NIGHT..CLOUDY. WIND BECOMING SOUTH 20 KM/H NEAR MIDNIGHT.
LOW 19.
BARRIE - ORILLIA - MIDLAND.
TONIGHT..CLEAR. WIND NORTHWEST 20 KM/H BECOMING LIGHT LATE THIS
EVENING. LOW 10.
TUESDAY..A MIX OF SUN AND CLOUD. HIGH 24. HUMIDEX 30. UV INDEX 6 OR
HIGH.
TUESDAY NIGHT..PARTLY CLOUDY. BECOMING CLOUDY NEAR MIDNIGHT. WIND
BECOMING SOUTH 20 KM/H NEAR MIDNIGHT. LOW 17.
BELLEVILLE - QUINTE - NORTHUMBERLAND.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. LOW 13.
TUESDAY..SUNNY. INCREASING CLOUDINESS IN THE AFTERNOON. FOG PATCHES
DISSIPATING IN THE MORNING. HIGH 25. HUMIDEX 30. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..CLOUDY. LOW 17.
KINGSTON - PRINCE EDWARD.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. WIND WEST 20 KM/H
BECOMING LIGHT EARLY THIS EVENING. LOW 13.
TUESDAY..SUNNY. INCREASING CLOUDINESS IN THE AFTERNOON. FOG PATCHES
DISSIPATING IN THE MORNING. HIGH 25. HUMIDEX 30. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..CLOUDY. WIND BECOMING SOUTH 20 KM/H BEFORE MORNING.
LOW 17.
PETERBOROUGH - KAWARTHA LAKES.
TONIGHT..CLEAR. FOG PATCHES DEVELOPING OVERNIGHT. LOW 10.
TUESDAY..INCREASING CLOUDINESS. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 24. HUMIDEX 28. UV INDEX 4 OR MODERATE.
TUESDAY NIGHT..OVERCAST. LOW 14.
STIRLING - TWEED - SOUTH FRONTENAC.
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY THIS EVENING. FOG PATCHES
DEVELOPING OVERNIGHT. LOW 12.
TUESDAY..A MIX OF SUN AND CLOUD. FOG PATCHES DISSIPATING IN THE
MORNING. HIGH 25. HUMIDEX 30. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..OVERCAST. LOW 17.
BANCROFT - BON ECHO PARK.
TONIGHT..CLEAR EARLY THIS EVENING THEN PARTLY CLOUDY WITH 30 PERCENT
CHANCE OF SHOWERS OVERNIGHT. FOG PATCHES DEVELOPING OVERNIGHT.
LOW 11.
TUESDAY..A MIX OF SUN AND CLOUD. 30 PERCENT CHANCE OF SHOWERS EARLY
IN THE MORNING. FOG PATCHES DISSIPATING IN THE MORNING. HIGH 24.
HUMIDEX 29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..OVERCAST. LOW 15.
BROCKVILLE - LEEDS AND GRENVILLE.
TONIGHT..CLEAR EARLY THIS EVENING THEN PARTLY CLOUDY WITH 40 PERCENT
CHANCE OF SHOWERS BEFORE MORNING. LOW 14.
TUESDAY..A MIX OF SUN AND CLOUD. 60 PERCENT CHANCE OF SHOWERS IN THE
MORNING. HIGH 24. HUMIDEX 29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..OVERCAST. LOW 16.
CITY OF OTTAWA.
TONIGHT..CLEAR. INCREASING CLOUDINESS NEAR MIDNIGHT THEN 40 PERCENT
CHANCE OF SHOWERS BEFORE MORNING. WIND WEST 20 KM/H BECOMING LIGHT
LATE THIS EVENING. LOW 15.
TUESDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING.
HIGH 23. HUMIDEX 27. UV INDEX 5 OR MODERATE.
TUESDAY NIGHT..MAINLY CLOUDY. LOW 16.
GATINEAU.
TONIGHT..CLEAR. INCREASING CLOUDINESS NEAR MIDNIGHT THEN 40 PERCENT
CHANCE OF SHOWERS BEFORE MORNING. WIND WEST 20 KM/H BECOMING LIGHT
THIS EVENING. LOW 16.
TUESDAY..CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING.
HIGH 24. HUMIDEX 27. UV INDEX 4 OR MODERATE.
TUESDAY NIGHT..CLOUDY. LOW 16.
PRESCOTT AND RUSSELL.
TONIGHT..CLEAR. INCREASING CLOUDINESS NEAR MIDNIGHT THEN 40 PERCENT
CHANCE OF SHOWERS BEFORE MORNING. LOW 16.
TUESDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING.
HIGH 23. HUMIDEX 28. UV INDEX 5 OR MODERATE.
TUESDAY NIGHT..MAINLY CLOUDY. LOW 16.
CORNWALL - MORRISBURG.
TONIGHT..CLEAR. INCREASING CLOUDINESS NEAR MIDNIGHT THEN 40 PERCENT
CHANCE OF SHOWERS BEFORE MORNING. LOW 14.
TUESDAY..MAINLY CLOUDY. 60 PERCENT CHANCE OF SHOWERS IN THE MORNING.
HIGH 24. HUMIDEX 29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..MAINLY CLOUDY. LOW 15.
SMITHS FALLS - LANARK - SHARBOT LAKE.
TONIGHT..CLEAR. INCREASING CLOUDINESS THIS EVENING THEN 40 PERCENT
CHANCE OF SHOWERS OVERNIGHT. FOG PATCHES DEVELOPING OVERNIGHT.
LOW 14.
TUESDAY..A MIX OF SUN AND CLOUD. 40 PERCENT CHANCE OF SHOWERS IN THE
MORNING. FOG PATCHES DISSIPATING IN THE MORNING. HIGH 24. HUMIDEX
29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..OVERCAST. LOW 17.
PORT CARLING - PORT SEVERN
BRACEBRIDGE - GRAVENHURST.
TONIGHT..CLEAR. BECOMING PARTLY CLOUDY AFTER MIDNIGHT. LOW 12.
TUESDAY..MAINLY CLOUDY. HIGH 25. HUMIDEX 29. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..MAINLY CLOUDY. LOW 17.
TOWN OF PARRY SOUND - ROSSEAU - KILLBEAR PARK
HUNTSVILLE - BAYSVILLE.
TONIGHT..CLEAR. INCREASING CLOUDINESS AFTER MIDNIGHT. LOW 13.
TUESDAY..A MIX OF SUN AND CLOUD. BECOMING CLOUDY LATE IN THE MORNING.
HIGH 24. HUMIDEX 28. UV INDEX 4 OR MODERATE.
TUESDAY NIGHT..CLOUDY. 60 PERCENT CHANCE OF SHOWERS OVERNIGHT.
LOW 16.
HALIBURTON.
TONIGHT..A FEW CLOUDS. FOG PATCHES DEVELOPING OVERNIGHT. LOW 13.
TUESDAY..MAINLY CLOUDY. FOG PATCHES DISSIPATING IN THE MORNING.
HIGH 22. HUMIDEX 26. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..OVERCAST. LOW 16.
BARRY'S BAY - KILLALOE
RENFREW - ARNPRIOR - CALABOGIE.
TONIGHT..CLEAR EARLY THIS EVENING THEN PARTLY CLOUDY WITH 40 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 14.
TUESDAY..MAINLY CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING.
HIGH 23. HUMIDEX 28. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..CLOUDY. LOW 16.
PETAWAWA - PEMBROKE - COBDEN.
TONIGHT..CLEAR. INCREASING CLOUDINESS NEAR MIDNIGHT THEN 40 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 17.
TUESDAY..CLOUDY. 40 PERCENT CHANCE OF SHOWERS IN THE MORNING.
HIGH 23. HUMIDEX 28. UV INDEX 4 OR MODERATE.
TUESDAY NIGHT..CLOUDY. LOW 16.
ALGONQUIN.
TONIGHT..CLEAR EARLY THIS EVENING THEN PARTLY CLOUDY WITH 40 PERCENT
CHANCE OF SHOWERS OVERNIGHT. LOW 11.
TUESDAY..A MIX OF SUN AND CLOUD. BECOMING CLOUDY IN THE AFTERNOON.
HIGH 24. HUMIDEX 28. UV INDEX 6 OR HIGH.
TUESDAY NIGHT..CLOUDY. 60 PERCENT CHANCE OF SHOWERS OVERNIGHT.
LOW 14.
BURK'S FALLS - BAYFIELD INLET.
TONIGHT..PARTLY CLOUDY. LOW 14.
TUESDAY..A MIX OF SUN AND CLOUD. BECOMING CLOUDY LATE IN THE MORNING.
HIGH 23. HUMIDEX 27. UV INDEX 4 OR MODERATE.
TUESDAY NIGHT..CLOUDY. 60 PERCENT CHANCE OF SHOWERS OVERNIGHT.
LOW 16.
END
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