Water temperature in Sarnia

This data the coastal Sarnia water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current water temperature in Sarnia

Water temperature in Sarnia today is 19.1°C. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Huron near Sarnia was recorded in 2022 and was 21.6°C, and the coldest was recorded in 2014 at 18.1°C. Water temperature in Sarnia is expected to be constant 19.1°C in the next 10 days. September average water temperature in Sarnia is 20.1°C, the minimum temperature is 16.8°C, and the maximum is 23.3°C.

The swimming season in Sarnia lasts from July to September. During those months, Sarnia water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Sarnia in winter reaches 2.9°C, in spring 4°C, in summer the average temperature rises to 19.1°C, and in autumn it is 15°C.

Sarnia water temperature now

Surf Forecast in Sarnia for today

Another important indicators for a comfortable holiday on the beach are the presence and height of the waves, as well as the speed and direction of the wind. Please find below data on the swell size for Sarnia. We calculate the swell size based on the mean wave height (trough to crest) of each third highest wave. For more information on surf forecasts for the next ten days, please visit sea state forecast Sarnia. Data in table shown for 14 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Sarnia

Sarnia weather forecast

Current temperature and weather

Data in a table show Sarnia temperature today (14 September 2025). For more information and forecast for a few days, go to the weather forecast Sarnia.

0-3 h	3-6 h	6-9 h	9-12 h
17.6°C	14.6°C	12.5°C	13.6°C

12-15 h	15-18 h	18-21 h	21-24 h
17.4°C	18.8°C	17.3°C	15.8°C

Sarnia water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Sarnia. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Sarnia on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Sarnia

The nearest beaches and cities from Sarnia with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Canatara Beach	19.1°C	19°C		0.03 m
Point Edward	19.1°C	19°C		0.03 m
Brights Grove	19°C	25°C		0.03 m
Lakeport	19.2°C	24°C		0.03 m
Fort Gratiot Township	19.1°C	24°C		0.03 m
Highland Glen	18.9°C	25°C		0.04 m
Kennedy Acres	18.9°C	25°C		0.04 m
Kettle Point	18.9°C	25°C		0.04 m
Lexington	19.2°C	24°C		0.03 m
Ipperwash Beach	18.9°C	25°C		0.04 m

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Our report for Sarnia is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.