Water temperature in Lake Simcoe

This data the coastal Lake Simcoe 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 Lake Simcoe

Water temperature in Lake Simcoe today is 19.1°C. Based on our historical data over a period of ten years, the warmest water in this day in Lake Simcoe was recorded in 2017 and was 21.4°C, and the coldest was recorded in 2014 at 16.5°C. Water temperature in Lake Simcoe is expected to drop to 17.4°C in the next 10 days. September average water temperature in Lake Simcoe is 20.1°C, the minimum temperature is 16.5°C, and the maximum is 23.3°C.

The swimming season in Lake Simcoe lasts from July to September. During those months, Lake Simcoe water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Lake Simcoe in winter reaches 1.5°C, in spring 4.6°C, in summer the average temperature rises to 21.1°C, and in autumn it is 14.7°C.

Lake Simcoe water temperature now

Surf Forecast in Lake Simcoe 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 Lake Simcoe. 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 Lake Simcoe. Data in table shown for 23 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Lake Simcoe

Lake Simcoe weather forecast

Current temperature and weather

Data in a table show Lake Simcoe temperature today (23 September 2025). For more information and forecast for a few days, go to the weather forecast Lake Simcoe.

0-3 h	3-6 h	6-9 h	9-12 h
18.4°C	17.6°C	17.1°C	17.8°C

12-15 h	15-18 h	18-21 h	21-24 h
19.9°C	20.7°C	20.3°C	18.7°C

Lake Simcoe water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Lake Simcoe. 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 Lake Simcoe 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 Lake Simcoe

The nearest beaches and cities from Lake Simcoe 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
Sibbald Point	19.3°C	21°C		0.1 m
Georgina	19.3°C	22°C		0.1 m
Jacksons Point	19.3°C	22°C		0.1 m
Mara Beach	18.9°C	21°C		0.13 m
Barrie	19.3°C	21°C		0.01 m
Cook's Bay	19.3°C	21°C		0.01 m
Orillia	18.8°C	23°C		0.01 m
Innisfil Beach	19.5°C	24°C		0.01 m
Kempenfelt Bay	19.3°C	22°C		0.01 m
Centennial Beach	19.3°C	22°C		0.01 m

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Our report for Lake Simcoe 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.