Water temperature in Hamilton (ON)

This data the coastal Hamilton 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 Hamilton

Water temperature in Hamilton today is 21.1°C. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Ontario near Hamilton was recorded in 2021 and was 23°C, and the coldest was recorded in 2017 at 18.3°C. Water temperature in Hamilton is expected to drop to 19.7°C in the next 10 days. September average water temperature in Hamilton is 19.6°C, the minimum temperature is 13.4°C, and the maximum is 23.7°C.

The swimming season in Hamilton lasts from July to September. During those months, Hamilton water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Hamilton in winter reaches 3.3°C, in spring 5.1°C, in summer the average temperature rises to 19°C, and in autumn it is 13.9°C.

Hamilton water temperature now

Surf Forecast in Hamilton 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 Hamilton. 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 Hamilton. Data in table shown for 6 September 2025, time in GMT 0 format (you can change the time zone on the sea state forecast page)

Surf report in Hamilton

Hamilton weather forecast

Current temperature and weather

Data in a table show Hamilton temperature today (6 September 2025). For more information and forecast for a few days, go to the weather forecast Hamilton.

0-3 h	3-6 h	6-9 h	9-12 h
12.7°C	11.9°C	13.2°C	16.5°C

12-15 h	15-18 h	18-21 h	21-24 h
21.7°C	24°C	23°C	18.9°C

Hamilton water temperature by month

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

The nearest beaches and cities from Hamilton 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
Oakville	21°C	23°C		0.37 m
Burlington	20.9°C	24°C		0.37 m
Fifty Point	21°C	23°C		0.31 m
Port Credit	20.9°C	23°C		0.54 m
Grimsby	21°C	24°C		0.37 m
Mississauga	20.8°C	23°C		0.48 m
Niagara-on-the-Lake	21.1°C	24°C		0.49 m
St. Catharines	21.3°C	23°C		0.39 m
Thorold	21.4°C	24°C		0.39 m
Port Dalhousie	21.4°C	24°C		0.39 m

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Hamilton Beach

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Our report for Hamilton 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.