Oshawa Saturday weather is expected to clear for Halloween, with a daytime high of 14 C, according to Environment Canada’s forecast issued at 5 a.m. EDT on October 31, 2026.
The federal weather agency says fog patches will dissipate early this morning. The UV index is forecast to reach 3, or moderate.
Clear tonight, with fog after midnight
Tonight’s forecast calls for clear skies and a low of 3 C. Fog patches are expected to develop after midnight.
That overnight fog forecast is separate from the evening outlook. Environment Canada does not identify the entire evening as foggy in the forecast reviewed.
A mild start to November
Sunday, November 1, is forecast to bring a mix of sun and cloud, with morning fog patches dissipating and a high of 16 C. The UV index is again expected to reach 3, or moderate.
Cloudy periods are forecast for Sunday night, with a low of 7 C. Monday’s outlook also calls for a mix of sun and cloud and a high of 16 C.
The Oshawa Saturday weather forecast is a local outlook rather than a guarantee of conditions at every Durham Region address. Residents planning outdoor activities or travel should check the updated forecast and any weather alerts before heading out.
Source
Environment Canada’s Oshawa forecast, issued October 31, 2026, at 5 a.m. EDT.
