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Home News Weather

Sunny Oshawa Forecast Calls for High of 21 C

All About Durham Editorial Team by All About Durham Editorial Team
September 18, 2026
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Original sunny-weather illustration for the Oshawa forecast on September 18
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The Oshawa weather forecast calls for sunny skies and a high of 21 C on Friday, September 18.

Environment and Climate Change Canada’s 5 a.m. update for Pickering, Oshawa and southern Durham Region also lists a high UV index of 6.

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Sunny and cooler across southern Durham

At 5 a.m., the Oshawa Executive Airport station reported clear skies, a temperature near 15 C and west-northwest winds at 8 km/h, gusting to 28 km/h.

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Northerly winds near 15 km/h are expected through the morning before easing. The federal hourly forecast keeps the chance of precipitation at 10 per cent through the daytime hours.

A broader southern Ontario outlook published by INsauga Thursday evening called for a warmer feel in parts of the province. Durham residents should use the local federal forecast, which reflects conditions for Pickering, Oshawa and southern Durham.

Clear Friday night, mainly sunny Saturday

Friday night is forecast to remain clear with a low of 9 C. Winds are expected to shift from north to northeast and then east at about 10 km/h.

Saturday should be mainly sunny with a high of 19 C and another high UV index of 6. Clouds are expected Saturday night, with a 30 per cent chance of showers and a low of 11 C.

Sunday is forecast to be cloudy with a 30 per cent chance of showers and a high near 20 C. Forecasts can change as new observations arrive, so residents planning weather-sensitive activities should check the latest federal update.

Sources

  • Environment and Climate Change Canada local forecast
  • INsauga southern Ontario outlook

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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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