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Water temperature in Ottawa (ON) in August

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Is it warm enough to swim in Ottawa in August? Average water temperature in Ottawa in August is 20°C and therefore suitable for comfortable swimming. The warmest water in Ottawa in August is 26°C, and the coldest is 17°C. To find out the water temperature today and in the coming days, go to Current water temperature in Ottawa

Changes water temperature in Ottawa in August 2025, 2024

To get an accurate forecast for the water temperature in Ottawa for any chosen month, compare two years within a 10 year range using the chart below.

You can choose any other years:

Year 1:   Year 2:


Day 2025 2024
1 August22°C 
2 August22°C24°C
3 August21°C24°C
4 August20°C 
5 August21°C 
6 August21°C21°C
7 August22°C21°C
8 August23°C20°C
9 August24°C19°C
10 August26°C 
11 August25°C19°C
12 August25°C 
13 August25°C 
14 August25°C20°C
15 August23°C21°C
Day 2025 2024
16 August22°C21°C
17 August20°C21°C
18 August20°C21°C
19 August19°C19°C
20 August19°C18°C
21 August19°C17°C
22 August19°C17°C
23 August19°C17°C
24 August19°C18°C
25 August20°C19°C
26 August19°C20°C
27 August19°C20°C
28 August17°C19°C
29 August16°C20°C
30 August16°C19°C
31 August16°C18°C

Ottawa water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in August?

Want to know where the water temperature in August is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 16°C
 Average temperature  Maximum temperature

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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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.

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