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Oshawa (ON) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Oshawa.
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Climate overview of Oshawa
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. It experiences warm summers and very cold winters, creating some seasonal variation. July is the sunniest month, averaging 9.3 hours of sunshine per day.
Oshawa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Oshawa - and find the best time to visit.
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).
Best Time to Visit Oshawa
Conditions in Oshawa are generally most comfortable in June, July, August and September. They are typically least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
cold
Apr
mixed
May
good
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
good
Nov
cold
Dec
cold
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and very cold winters
- Coldest conditions: January, with freezing nights around -9°C (16°F).
Frequently asked questions about the climate in Oshawa
What is the best time to visit Oshawa?
June, July, August and September typically offer the most optimal weather in Oshawa. In contrast, January, February, March, November and December tend to have less optimal conditions. Oshawa has warm summers and very cold winters.
What temperatures can I expect in Oshawa?
Daytime highs range from 0°C (32°F) in January to 26°C (79°F) in July. Nighttime lows range from -9°C (16°F) to 17°C (63°F). Temperatures vary considerably through the year.
How much rain does Oshawa get?
Annual rainfall is around 978 mm (39 in). April is the wettest month with 92 mm (3.6 in), while February is the driest with 65 mm (2.6 in).
How sunny is Oshawa?
Oshawa receives around 2,070 hours of sunshine per year. July is the sunniest month with 280 hours, while December is the cloudiest with just 78 hours. Overall, Oshawa enjoys abundant sunshine.
Oshawa 3-Day Forecast
Oshawa on the map
Oshawa is highlighted - select any city to see its climate.
Popular in September
Where to go in September - average daytime high across popular destinations.
Toronto
22°C (72°F) Niagara Falls23°C (73°F) Montréal
22°C (72°F) Ottawa22°C (72°F) Quebec City
20°C (68°F) Vancouver19°C (66°F) Calgary19°C (66°F) Whistler15°C (59°F) Bucket list
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