Lake Ontario Water Temperature
(Today) Apr 2025
3.4°C / 38.2°F
The water will feel freezing / baltic. You would have to be insane or getting paid to want to get in water this cold! If you do make sure you are wearing a top end drysuit and all the accessories.
Current weather
5°C / 42°F
(overcast clouds)
(overcast clouds)
Wind
9 mph
Humidity
76%
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 Toronto