Water temperature in St. Catharines

This data the coastal St. Catharines 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 St. Catharines

Water temperature in St. Catharines today is 18.1°C. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Ontario near St. Catharines was, like today, 18.1°C, and the coldest was recorded in 2012 at 10.9°C. Water temperature in St. Catharines is expected to drop to 13°C in the next 10 days. October average water temperature in St. Catharines is 14.7°C, the minimum temperature is 7.2°C, and the maximum is 20°C.

The swimming season in St. Catharines lasts from July to September. During those months, St. Catharines water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in St. Catharines in winter reaches 3.7°C, in spring 5.3°C, in summer the average temperature rises to 19.8°C, and in autumn it is 14.3°C.

St. Catharines water temperature now

Surf Forecast in St. Catharines 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 St. Catharines. 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 St. Catharines. 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 St. Catharines

St. Catharines weather forecast

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
10.3°C	8.7°C	8.4°C	11.9°C

12-15 h	15-18 h	18-21 h	21-24 h
16.6°C	18.6°C	16.1°C	12.5°C

St. Catharines water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in St. Catharines. 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 St. Catharines 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 St. Catharines

The nearest beaches and cities from St. Catharines 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
Port Dalhousie	18.1°C	19°C		0.34 m
Grimsby	17.7°C	19°C		0.46 m
Fifty Point	17.6°C	19°C		0.45 m
Port Credit	17.8°C	17°C		0.54 m
Toronto Islands	17.7°C	17°C		0.5 m
Centre Island Beach	17.7°C	17°C		0.5 m
Toronto	17.7°C	19°C		0.5 m
Oakville	17.8°C	17°C		0.46 m
Hanlan's Point	17.7°C	17°C		0.5 m
Mississauga	17.8°C	17°C		0.47 m

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St Catharines

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Our report for St. Catharines 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.