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Ontario Weather September
To help you choose the best time to travel, you can find climate data below on the weather in Ontario in September.
| Ontario Weather September: | Niagara Falls | Toronto | |
 | average daily high | +21.9°C | +21°C |
 | average daily low | +12.3°C | +13.4°C |
 | sea temperature | +20.1°C | |
 | daylight hours | 12.9h | 12.9h |
 | sunny/overcast hours | 6.5/6.4h | |
 | average monthly precipitation | 98 mm | 85 mm |
Temperature in Ontario
The average daily maximum in September is +21.9 — +21°C, and the minimum +12.3 — +13.4°C.
Best places in Ontario:
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Sea temperature
The average monthly temperature in Lake Ontario on the beaches of Toronto in September is +20.1 degrees.
The water is warm enough for most people to bathe in, however a majority would still consider it too cool.
Precipitation
The normal amount of precipitation for September is from 85 to 98 mm, which may cause a change of plans on certain days.