This data the coastal Mississauga 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.
Water temperature in Mississauga today is 20.8°C. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Ontario near Mississauga was recorded in 2021 and was 22.8°C, and the coldest was recorded in 2017 at 18.5°C. Water temperature in Mississauga is expected to drop to 19.3°C in the next 10 days. September average water temperature in Mississauga is 19.4°C, the minimum temperature is 13.9°C, and the maximum is 23.1°C.
The swimming season in Mississauga lasts from July to September. During those months, Mississauga water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Mississauga in winter reaches 3.5°C, in spring 4.8°C, in summer the average temperature rises to 18.3°C, and in autumn it is 13.7°C.
5 September 2025 |
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today temp |
20.8°C |
4 September 2025 |
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yesterday temp |
21°C |
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 Mississauga. 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 Mississauga. Data in table shown for 5 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
0' 8" | 0' 4" | 0' 6" | 1' 5" |
0.2 m | 0.1 m | 0.15 m | 0.44 m |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
2' 3" | 2' 9" | 2' 8" | 2' 0" |
0.69 m | 0.84 m | 0.81 m | 0.61 m |
Data in a table show Mississauga temperature today (5 September 2025). For more information and forecast for a few days, go to the weather forecast Mississauga.
0-3 h | 3-6 h | 6-9 h | 9-12 h |
---|---|---|---|
![]() | ![]() | ![]() | ![]() |
15.3°C | 15°C | 15.6°C | 16.3°C |
12-15 h | 15-18 h | 18-21 h | 21-24 h |
---|---|---|---|
![]() | ![]() | ![]() | ![]() |
21°C | 23.2°C | 22.9°C | 19.5°C |
You may also be interested in other sections of our site for Mississauga: Sunrise and Sunset, Tides
These figures shows the average, minimum and maximum monthly water temperature in Mississauga. 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 Mississauga 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
Month | Avr | Min | Max | |
---|---|---|---|---|
January | 3.2°C | 1.4°C | 5.1°C | cold |
Water temperature in Mississauga in January | ||||
February | 2.4°C | -0.4°C | 4.5°C | cold |
Water temperature in Mississauga in February | ||||
March | 2.6°C | 0°C | 5.9°C | cold |
Water temperature in Mississauga in March | ||||
April | 4°C | 0.3°C | 6.5°C | cold |
Water temperature in Mississauga in April | ||||
May | 7.9°C | 3.3°C | 16.9°C | cold |
Water temperature in Mississauga in May | ||||
June | 14.1°C | 6°C | 20.6°C | cold |
Water temperature in Mississauga in June | ||||
July | 19.8°C | 12.9°C | 24.8°C | cold |
Water temperature in Mississauga in July | ||||
August | 21°C | 15.7°C | 24.7°C | warm |
Water temperature in Mississauga in August | ||||
September | 19.4°C | 13.9°C | 23.1°C | cold |
Water temperature in Mississauga in September | ||||
October | 14.1°C | 6.1°C | 20.4°C | cold |
Water temperature in Mississauga in October | ||||
November | 7.7°C | 4.1°C | 13.4°C | cold |
Water temperature in Mississauga in November | ||||
December | 4.8°C | 2°C | 7.5°C | cold |
Water temperature in Mississauga in December |