Water temperature in Sunnyside Beach

This data the coastal Sunnyside Beach 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 Sunnyside Beach

Water temperature in Sunnyside Beach today is 17.7°C. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Ontario near Sunnyside Beach was recorded in 2021 and was 18.5°C, and the coldest was recorded in 2012 at 10.4°C. Water temperature in Sunnyside Beach is expected to drop to 12.3°C in the next 10 days. October average water temperature in Sunnyside Beach is 14.1°C, the minimum temperature is 6.1°C, and the maximum is 19.9°C.

The swimming season in Sunnyside Beach lasts from July to September. During those months, Sunnyside Beach water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Sunnyside Beach in winter reaches 3.7°C, in spring 4.6°C, in summer the average temperature rises to 18.3°C, and in autumn it is 13.8°C.

Sunnyside Beach water temperature now

Surf Forecast in Sunnyside Beach 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 Sunnyside Beach. 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 Sunnyside Beach. Data in table shown for 13 October 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Sunnyside Beach

Sunnyside Beach weather forecast

Current temperature and weather

Data in a table show Sunnyside Beach temperature today (13 October 2025). For more information and forecast for a few days, go to the weather forecast Sunnyside Beach.

0-3 h	3-6 h	6-9 h	9-12 h
11.9°C	11.2°C	12.4°C	14.4°C

12-15 h	15-18 h	18-21 h	21-24 h
16.2°C	16.6°C	16.1°C	14.8°C

Sunnyside Beach water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Sunnyside Beach. 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 Sunnyside Beach 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 Sunnyside Beach

The nearest beaches and cities from Sunnyside Beach 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
Humber Bay	17.7°C	17°C		0.47 m
Centre Island Beach	17.7°C	17°C		0.5 m
Kew Balmy Beach	17.6°C	17°C		0.52 m
Niagara-on-the-Lake	17.7°C	18°C		0.45 m
Rouge Beach	17.7°C	20°C		0.5 m
St. Catharines	18.1°C	19°C		0.34 m
Thorold	18.1°C	19°C		0.34 m
Port Dalhousie	18.1°C	19°C		0.34 m
Fifty Point	17.6°C	19°C		0.45 m
Hamilton	17.9°C	18°C		0.45 m

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Sunnyside Park

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Our report for Sunnyside Beach 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.