Sarnia Water Temperature

(Today) 2024

20.8°C / 69.5°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.

*Live data from Lakeport Buoy, MI: 21.1°C / 70°F

Current weather

21°C / 71°F
(clear sky)
Partly cloudy
Wind
3 mph
Humidity
71%

The measurements for the water temperature in Sarnia, Ontario are provided by the daily satellite readings provided by the NOAA. The temperatures given are the sea surface temperature (SST) which is most relevant to recreational users.

*Live data may vary from satellite readings for a number of reasons. These include local factors, depth of smapling and time of day.

Water temp by month

Monthly average max / min water temperatures

The graph below shows the range of monthly Sarnia water temperature derived from many years of historical sea surface temperature data.

Sarnia average maximum / minimum water temperatures
Maximum and minimum monthly sea temperatures in Sarnia
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C -0.1 -0.3 -0.1 0.7 4 10.2 19.2 21.6 18.2 11.5 6.1 1.5
Max °C 2.9 0.9 1.3 5.9 11 21.4 25.6 24.9 23.4 19.4 12.9 7.2
Min °F 33 31.9 32.5 35.3 42 54.8 69.1 72.2 66.8 55.8 45.7 36.9
Max °F 36 33.1 33.8 40.5 49 66 75.5 75.5 72 63.7 52.5 42.6

The warmest water temperature is in August with an average around 73.8°F / 23.2°C. The coldest month is February with an average water temperature of 32.5°F / 0.3°C.

7 day tide forecast for Sarnia

SatSunMonTueWedThuFri
  • Low 2:17am
    (0.14m)
  • High 8:12am
    (1.04m)
  • Low 3:27pm
    (0.09m)
  • High 8:55pm
    (0.87m)
  • Low 3:13am
    (0.11m)
  • High 9:00am
    (1.06m)
  • Low 4:13pm
    (0.06m)
  • High 9:39pm
    (0.91m)
  • Low 4:07am
    (0.09m)
  • High 9:48am
    (1.08m)
  • Low 4:58pm
    (0.04m)
  • High 10:24pm
    (0.95m)
  • Low 4:59am
    (0.08m)
  • High 10:36am
    (1.08m)
  • Low 5:42pm
    (0.02m)
  • High 11:10pm
    (0.98m)
  • Low 5:52am
    (0.07m)
  • High 11:25am
    (1.07m)
  • Low 6:25pm
    (0.01m)
  • High 11:58pm
    (1.01m)
  • Low 6:46am
    (0.08m)
  • High 12:16pm
    (1.03m)
  • Low 7:09pm
    (0.02m)
  • High 12:48am
    (1.04m)
  • Low 7:42am
    (0.09m)
  • High 1:09pm
    (0.99m)
  • Low 7:55pm
    (0.03m)
7 day tide times for Sarnia

*These tide times are estimates based on the nearest accurate location (Chain Bridge, D.C.) and may differ by up to half an hour depending on distance. Please note, the tide times given are not suitable for navigational purposes.