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Home News Weather

Oshawa Forecast Calls for Clouds and High Near 20 C

All About Durham Editorial Team by All About Durham Editorial Team
September 20, 2026
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Original illustration of clouds and sunshine for the Oshawa weather forecast on September 20
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The Oshawa weather forecast calls for a dry Sunday with a mix of sun and cloud and an afternoon high near 20 C on September 20.

Forecast data for central Oshawa showed temperatures rising from about 13 C at 9 a.m. to approximately 20.4 C late in the afternoon. The projected overnight low was near 10 C.

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Dry conditions expected through Sunday

The maximum precipitation probability was three per cent, with no measurable rain indicated for the daytime hours. Conditions were expected to become mainly cloudy through much of the afternoon after some morning sunshine.

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Wind speeds were forecast to remain moderate, generally between 13 and 15 km/h during the warmest part of the day. The daily ultraviolet index was forecast to peak near 5, a moderate level. Sunrise was at approximately 7 a.m., with sunset expected around 7:16 p.m.

Cooler Monday follows

Monday is forecast to be noticeably cooler, with a high near 15 C and a low around 7 C. Cloudy conditions are expected, but the available forecast showed little chance of precipitation.

Tuesday is projected to warm slightly, reaching about 18 C after another cool morning. Forecasts can change as new observations arrive, so residents planning weather-sensitive outdoor activities should check the latest local update before leaving.

No weather warning was in effect in the source data reviewed for this report.

Sources

  • Open-Meteo forecast data for Oshawa
  • Environment and Climate Change Canada local forecast

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Tags: OshawaOshawa WeatherOshawa weather 2026Oshawa weather forecastOshawa Whitby Ajax Pickering Clarington Uxbridge Scugog Brock
All About Durham Editorial Team

All About Durham Editorial Team

The All About Durham Editorial Team covers local news, events, public safety, weather and community updates across Durham Region, Ontario.

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