Water temperature in Ottawa

This data the coastal Ottawa 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 Ottawa

Water temperature in Ottawa today is 15°C. Based on our historical data over a period of ten years, the warmest water in this day in Ottawa was 19°C, and the coldest 15°C. Water temperature in Ottawa is expected to rise to 15.5°C in the next 10 days. September average water temperature in Ottawa is 16.5°C, the minimum temperature is 11°C, and the maximum is 22°C.

The swimming season in Ottawa lasts from July to August. During those months, Ottawa water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Ottawa in winter reaches 2.9°C, in spring 6.8°C, in summer the average temperature rises to 19.7°C, and in autumn it is 10.7°C.

Ottawa water temperature now

Current temperature and weather

Data in a table show Ottawa temperature today (12 September 2025). For more information and forecast for a few days, go to the weather forecast Ottawa.

0-3 h	3-6 h	6-9 h	9-12 h
14.2°C	13.5°C	12.3°C	14.8°C

12-15 h	15-18 h	18-21 h	21-24 h
18.9°C	22.4°C	22.1°C	17.1°C

Ottawa water temperature by month

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

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Ottawa river

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Our report for Ottawa 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.