Ottawa Weather in October

The climate in Ottawa during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Ottawa and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a cool 17°C (63°F), whilst at night 5°C (41°F) is normal.

On average October is the 3rd driest month of the year in Ottawa with around 60mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.6 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.