Lake Ontario Water Temperature
(Today) Sep 2024
20.6°C / 69°F
The water will feel tepid. Swimming will be tolerable without a wetsuit, although it will take a little getting used to. If you intend to stay in the water for a while a 3/2mm wetsuit will be ideal.
Current weather
11°C / 51°F
(broken clouds)
(broken clouds)
Wind
20 mph
Humidity
79%
Water temps is based on average surface temperatures measured throughout Lake Ontario.
Map showing Lake Ontario locations. Click on pins to view water temperature.
16 locations listed in Lake Ontario.
Based on readings from Mississauga