Ottawa weather

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The weather guide for Ottawa, Ontario shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

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Which is the hottest month in Ottawa?

The hottest time of year in Ottawa is normally July. Expect maximum daytime temperatures to reach 26°C with low heat and humidity.

Which month has the most rain in Ottawa?

In terms of rainfall, July is usually the wettest month in Ottawa with 88mm on average. There are normally 11 days in July with some rain.

When is it sunniest in Ottawa?

The sunniest time of year in Ottawa is normally July with bright sunshine on average for 59% of daylight hours; that's 9 hours of sunshine per day.

Metric (°C / mm)  |  Imperial (°F / inches)

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Compare Ottawa weather with the USA

Below the Ottawa weather chart shows average maximum daytime temperature for Ottawa, Ontario, Canada and the USA (Washington).

Maximum daytime temperature (°C)

Ottawa, Ontario, Canada
USA (Washington)
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Dec

Metric (°C / mm)  |  Imperial (°F / inches)

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