Montreal Bids Farewell to Summer with Spectacular September Weather
As summer in Montreal draws to a close, residents have been treated to a stunning stretch of weather that feels more like mid-July than late September. Over the past few weeks, temperatures have been soaring well above normal, creating an unusual but welcome late-summer experience. The last official day of summer may be upon us, but Montreal's warm spell has lingered, giving us a few extra weeks of sunshine and record-breaking heat.
Since mid-September, southern Quebec has seen consistent sunny skies and balmy conditions, with daytime highs reaching into the upper 20s. Montreal even hit a surprising 31°C (88°F) on September 16th, breaking a record that had stood since 1939. On several other days, temperatures hovered between 25°C and 28°C (77°F-83°F), considerably higher than the seasonal average of 18°C (65°F). Even the overnight lows have been remarkable, staying in the 16°C to 18°C (60°F-65°F) range, which is about double the usual low for this time of year.
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This burst of warm weather has come on the heels of what was a particularly rainy summer. However, September has been strikingly dry in contrast, with only two days of rain recorded—September 1st and 7th. Despite high humidity levels, Montreal has experienced a notably rain-free period, with just over 25 mm (1 inch) of precipitation recorded this month, a significant drop compared to the wet summer months.
The current weather pattern, known as a Rex Block, has been responsible for these extended sunny days. However, this pattern is expected to break down soon. As fall officially arrives, cooler air is on the way. A backdoor cold front is predicted to move in this weekend, bringing a shift in the wind and slightly cooler temperatures, though the weather will remain mild, with highs still in the 23°C to 25°C range.
By early next week, the weather will undergo a more noticeable change as low-pressure systems develop over the Great Lakes. Clouds and showers are expected to move into the region by midweek, signaling the end of Montreal's warm spell. Daytime highs will begin to settle into the mid-teens, and nighttime lows will dip into the single digits, marking a return to more seasonally appropriate temperatures.
While Montreal has been basking in this exceptional late-summer weather, the same weather system has been causing severe problems along the U.S. eastern seaboard. North Carolina, in particular, has seen torrential rain, with some areas reporting over 400 mm of rain in just 24 hours, leading to significant flooding. The Rex Block, which has kept Montreal sunny and warm, has delivered heavy surf, strong winds, and widespread coastal flooding to parts of the Middle Atlantic States.
As Montreal transitions into autumn, it’s time to savor the last few days of summer-like weather. With fall officially arriving this Sunday, the cooler, crisp air will soon remind us that the season is changing. Until then, enjoy the sunshine while it lasts!
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