Ottawa Weather in August

The climate in Ottawa during August can be summarized as hot and a little damp.

August is in the summer in Ottawa and is typically the 2nd warmest month of the year. Daytime maximum temperatures average around a warm 32°C (89°F), whilst at night 19°C (66°F) is normal.

On average August is the 4th wettest month of the year in Ottawa with around 100mm 3.9 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.1 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Ottawa in August 2025.