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