Ontario

Cornwall Faces Rainy Week With High UV Index

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boringnews
August 17, 2026 2:40 pm

Cornwall residents can expect a mix of sun and cloud this week, with a high UV index and several chances of showers, according to Environment Canada.

On Monday, the temperature reached 22.4°C at the Saint-Anicet observation station, with humidity at 80 percent and a Humidex of 29. The seven-day forecast shows daytime highs between 21°C and 26°C.

Monday will be mainly cloudy with a high of 25°C, while Tuesday will bring a mix of sun and cloud, also with a high of 25°C. The Humidex is expected to reach 33 on Monday, which falls in the “some discomfort” range. Environment Canada advises limiting or modifying outdoor exercise during such conditions.

The UV index is forecast to reach 7 on both Monday and Tuesday, putting it in the “high” risk category. Residents are encouraged to wear hats, tight-woven clothing, and sunscreen with SPF 30 or higher, especially between 11 a.m. and 3 p.m. Sun safety guidelines from the federal government highlight these precautions.

Showers are most likely on Wednesday and Sunday, each with a 60 percent chance. Thursday and Saturday also carry a 30 percent chance of showers. Friday is expected to be sunny with a high of 26°C.

While the story pitch mentioned a risk of thunderstorms Sunday night, the official forecast does not currently include thunderstorm risk for Sunday, only a 60 percent chance of showers. There are no weather alerts in effect for Cornwall.

Residents should monitor conditions, especially during outdoor activities. Lightning safety remains a concern; Environment Canada’s lightning safety guidance reminds people to go indoors when thunder roars and stay inside for at least 30 minutes after the last rumble.

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