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Home News Weather

Clouds Build in Oshawa Before Overnight Showers

All About Durham Editorial Team by All About Durham Editorial Team
September 12, 2026
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Clouds building over Oshawa ahead of overnight showers

Original editorial illustration for Clouds Build in Oshawa Before Overnight Showers.

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Oshawa weather is expected to turn increasingly cloudy Saturday morning before showers arrive overnight, according to the September 12 forecast.

The daytime high is expected to reach 26 C. The overnight low is forecast at 19 C, with a 40 per cent probability of precipitation and showers expected.

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Sunset in Oshawa is at 7:32 p.m. Saturday. Residents attending outdoor events should be prepared for cloudier conditions through the day and possible rain later.

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Showers forecast Sunday

Sunday is expected to bring showers and a high of 26 C. The overnight temperature is forecast to fall sharply to 9 C, with sunrise at 6:52 a.m.

The outlook calls for sunshine and a high of 20 C Monday, followed by a chance of showers Tuesday and Wednesday. Tuesday’s forecast high is 24 C, while Wednesday is expected to reach 23 C.

Cloudy conditions are forecast Thursday with a high of 22 C. Forecasts can change, particularly the timing and probability of precipitation, so residents should check Environment Canada before travel or outdoor activities.

Sources

  • DurhamRegion.com: Oshawa’s September 12 forecast
  • Environment and Climate Change Canada weather forecasts

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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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