Oshawa (ON) Weather & Climate: Best Time to Visit

The climate in Oshawa, Ontario, Canada, is marked by large temperature swings across the seasons, ranging from 26°C (79°F) in July to 0°C (32°F) in January.

Oshawa sees a moderate amount of rain/snowfall, totalling around 978 mm (39 in) per year. July is the sunniest month, averaging 9.3 hours of sunshine per day.

Monthly Temperature in Oshawa

In Oshawa, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a comfortable 26°C (79°F) in July, the warmest time of the year, to a very cold 0°C (32°F) during cooler months like January.

At night, you can expect temperatures ranging from 17°C (63°F) in July to around -9°C (16°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Rainfall in Oshawa

On average, Oshawa receives a reasonable amount of rain/snowfall, with an annual precipitation of 978 mm (39 in). Year-round, Oshawa has a balanced climate with minimal variation in precipitation. The difference between the wettest month, April, with 92 mm (3.6 in), and the driest month, February, with 65 mm (2.6 in), is minimal. For more details, please visit our Oshawa Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Sunshine Hours in Oshawa

Seasonal changes in sunshine hours are quite dramatic in Oshawa. While July receives considerable daily sunshine with up to 9.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 2.6 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Toronto, Canada (51 KM, 31 Miles).

Daily hours of sunshine

Data from: Toronto, Canada (51 KM, 31 Miles).

Daily percentage of sunshine

Data from: Toronto, Canada (51 KM, 31 Miles).

Humidity in Oshawa by Month

The city experiences its highest humidity in September, reaching 87%. In April, the humidity drops to its lowest level at 76%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year

Data from: Toronto, Canada (51 KM, 31 Miles).

Oshawa (ON) 3-Day Forecast

10-Day Forecast

Select a Month

Check the conditions for any month of the year.

Best Time to Visit Oshawa

The best time to visit Oshawa is during June, July, August and September, when the weather provides comfortable temperatures between 22°C (72°F) and 26°C (79°F). With rainfall of 81 mm (3.2 in) to 92 mm (3.6 in), you can expect pleasant weather during your visit in these months.

Seeking the perfect travel destination for this year? We've created a tool that suggests locations matching your desired weather. Let our weather planner guide your travel decisions.