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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Maple Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
The live forecast above shows current conditions in Oshawa, Ontario. Expect temperatures typical for this time of year, with clear skies or precipitation depending on the season. Lake Ontario moderates extremes, keeping winters milder than inland areas and summers slightly cooler.
What is the weather in Oshawa right now?
The live forecast above provides the current temperature, wind speed, humidity, and precipitation chance. Oshawa’s weather changes quickly due to lake breezes and passing systems. Check the 10‑day outlook for planning outdoor activities.
How does Oshawa’s climate vary by season?
Winters are cold but less severe than inland Ontario due to Lake Ontario’s warming effect. Snowfall averages around 120 centimetres, with lake‑effect snow possible. Summers are warm and humid, with July highs near 27°C. Spring and autumn bring rapid shifts and moderate rainfall.
Does Oshawa get lake‑effect snow?
Yes. Cold winds blowing over the relatively warm waters of Lake Ontario can produce bands of heavy snow, especially from November to January. Oshawa is in a common lake‑effect belt, though amounts vary each winter.
What is the best time to visit Oshawa?
Late spring (May–June) and early autumn (September–October) offer mild temperatures and lower humidity. Summer can be humid but is good for lakeside activities. Winter is cold but manageable with proper clothing.
How accurate is the Oshawa forecast?
Three‑day forecasts from Environment Canada are generally reliable. Accuracy drops after five days. Local lake effects can cause sudden changes, so check the live forecast above for updates.
For more Canadian weather, visit our Canada weather hub or the Toronto Weather page for nearby conditions.