Ontario Monthly Climate Averages

To help you choose the best time to travel, you can find climate data below on the weather in Ontario .


Month	Niagara Falls		Toronto
Month	day	night	day	night

January	-0.4°C	-7.8°C	-0.7°C	-6.7°C
February	+1.3°C	-6.6°C	+0.4°C	-5.6°C
March	+5.9°C	-3.5°C	+4.7°C	-1.9°C
April	+12.8°C	+2.2°C	+11.5°C	+4.1°C
May	+19.4°C	+7.7°C	+18.4°C	+9.9°C
June	+24.5°C	+13.7°C	+23.8°C	+14.9°C
July	+27.4°C	+17°C	+26.6°C	+18°C
August	+26°C	+16.2°C	+25.5°C	+17.4°C
September	+21.9°C	+12.3°C	+21°C	+13.4°C
October	+15.1°C	+6.3°C	+14°C	+7.4°C
November	+8.7°C	+1.1°C	+7.5°C	+2.3°C
December	+2.7°C	-4.1°C	+2.1°C	-3.1°C

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Temperature in Ontario

The table shows that the hottest months in Ontario are July and August, during which the average daytime temperature reaches 27.4°C and the nighttime temperature falls to 18°C.

The coldest months are January and February, when the daily average temperature falls to - 0.7°C, and drops to - 7.8°C during the night.

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Sea temperature

The highest average monthly temperature in Lake Ontario on the beaches of Toronto is in August and July and equals 21.4 22.4°C.

in Ontario climate by month

Precipitation

The largest amount of rain falls on average in September and November, up to 98mm, and the least in February and March — up to 62mm.