Ottawa is set to experience a stretch of muggy weather and sustained thunderstorm threats starting Monday, July 27, 2026, according to Environment Canada.
Temperatures are expected to rise quickly on Monday to a high of 28 degrees Celsius, with humidex values reaching 36 during the afternoon.
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Rain chances begin at 30 percent on Monday and are forecasted to climb to 70 percent by Tuesday before tapering off to 30 percent on Thursday.
Wind and Overnight Conditions
Strong wind gusts reaching up to 50 km/h are projected to develop by late Tuesday afternoon.
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Overnight temperatures will drop to 18 degrees on Tuesday night before reaching a maximum daytime temperature of 24 degrees, which will feel like 32 with the humidex.
Environment Canada also noted a UV index reading of 8 on Monday afternoon, which falls under the very high risk category.
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Air quality levels were temporarily impacted by wildfire activity in northwestern Ontario on Monday morning, with conditions expected to return to a low-risk rating of 2 by Monday night.
