Ottawa Weather in October

The climate in Ottawa during October can be summarized as mild and a little damp.

October is in the fall / autumn in Ottawa and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 22°C (71°F), whilst at night 8°C (47°F) is normal.

On average October is the 6th driest month of the year in Ottawa with around 85mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 7.5 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 October 2025.