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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Toronto Post Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Check the live forecast above for Oshawa’s current conditions, then plan around the day’s high and low ranges; a shift in wind direction or pressure often signals the next change.
What will the temperature feel like today and tonight?
Expect a high between the daytime peak shown in the live forecast and a low near the overnight minimum. Humidex values may add 2–4 degrees if humidity is elevated, while wind chill can subtract 3–6 degrees in stronger gusts. The daily range typically narrows when cloud cover persists.
How reliable is the 7-day outlook for Oshawa?
Environment Canada’s seven-day forecast for the Durham Region is generally reliable for broad trends — warm/cold spells — but day-to-day precipitation timing often shifts after day 3. For the weather for oshawa today and weather in oshawa tomorrow, confidence is high within 48 hours.
Does Oshawa get lake-effect snow?
Yes. Cold air crossing the relatively warm waters of Lake Ontario can produce narrow bands of heavy snow – often east of Toronto – affecting Oshawa. This is most common from November to February.
What are typical summer temperatures in Oshawa?
July highs average 26–28 °C, but humidex can push the feels-like temperature above 35 °C during heat events. Overnight lows usually stay between 16 and 19 °C near the lake.
Where can I find the oshawa weather 30 days outlook?
Thirty-day outlooks are only available as long-range trend forecasts from Environment Canada’s monthly weather summary. For day-by-day detail, stick to the 7- and 14-day forecasts on live sources.
Sources
For broader forecasts across Canada, see our Canada weather hub or the Toronto Weather page. Residents checking weather in oshawa 10 days or Ottawa Weather should compare multiple sources.
For severe alerts, visit Weather Warning.