Ottawa Braces for Frosty Nights as Fall Approaches
Ottawa is stepping into that familiar shoulder season where summer warmth is fading fast, and the first real chill of autumn is settling in. A frost advisory has been issued for the city and surrounding regions, reminding everyone that those crisp nights are here a little earlier than some might like. Temperatures are expected to drop sharply overnight, and while daytime highs will still bring sunshine, mornings may greet residents with a frosty sheen on car windshields and lawns.
According to Environment and Climate Change Canada, the cooler weather is not entirely out of the ordinary for mid-September. Still, the advisory serves as a heads-up for gardeners, farmers, and anyone camping out in cottage country. Sensitive plants could be damaged if left uncovered, and outdoor activities may feel much cooler once the sun sets. In fact, patchy frost has already been reported in spots like Algonquin Park, where campers woke up to icy grass and chilled air.
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During the day, Ottawa and much of eastern Ontario will see highs in the upper teens, which is a touch below seasonal norms. Southwestern Ontario, on the other hand, is expected to fare better, with temperatures reaching into the mid-20s. That contrast is typical this time of year, as warm air lingers longer in the southwest before cooler patterns push further east. By Saturday, most of Ontario will stay in the teens and low-20s, keeping things on the brisk side.
The story changes slightly on Sunday, when conditions will warm up again. Ottawa may still see frost in some pockets early in the morning, but daytime highs are forecasted to climb closer to 20 degrees, giving residents a pleasant window to enjoy outdoor plans. Toronto and surrounding areas might even see 23 to 25 degrees, which is a few degrees above the seasonal average. By evening, mild overnight lows are expected to keep the frost away, though a few spotty showers could drift into southwestern Ontario and head eastward overnight.
This weather pattern lines up with the broader seasonal shift that arrives on Monday. The fall equinox officially takes place on September 22 at 2:19 p.m., marking the astronomical start of autumn. For meteorologists, fall technically began at the start of the month, but for most of us, this date feels like the true turning point. The change in daylight hours will become more noticeable, mornings will stay cool, and the vibrant fall colours will soon follow.
So, while Ottawa enjoys some sunshine in the days ahead, the frost advisory serves as a reminder that summer’s grip is loosening. Jackets are back in rotation, gardens may need a little extra protection, and early risers should expect to see their breath in the morning air. It’s all part of the transition into a classic Canadian fall.
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