Lake Ontario Water Temperature
(Today) Sep 2024
21.2°C / 70.1°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
20°C / 69°F
(few clouds)
(few clouds)
Wind
13 mph
Humidity
82%
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 Oakville