Climate Comment for September 2025 – Yet Another Warm Month

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Submitted by Bill Caulfeild-Browne

Following the trend that’s been established for most of the year, the month turned in a mean temperature of 16.3C, or 1.8C above the historical norm. The highest the mercury reached was 24.7C on the 2nd and the lowest it dipped to was 8.9C on the 21st. 

The last ten days were consistently warm and led into an even warmer first week of October – where the highest temperature of 25.2C actually eclipsed the aforementioned high for September.

The downside was the lack of rain. We received only 50mm against a norm of 90mm – there were only three truly wet days.

Tobermory’s weather was much the same across the Province. With the exception of Toronto which got 153% of its usual rainfall, most communities saw only half what they might expect – and some like Kenora saw only 15%. And their temperatures, like us, were generally at least a degree or two above average.

Our peninsula was largely missed by the very high winds that afflicted areas northeast of Georgian Bay on September 5th, causing multiple power outages in Parry Sound and Sudbury. Likewise, the severe thunderstorms that hit Kitchener-Waterloo on September 21/22nd tracked to the south of us. Lightning there caused fires, multiple trees were broken or uprooted, damaging houses and cars. 63mm of rain poured down with 24 of those mm. falling in just one hour.

Ending on a positive note, sunshine was again abundant, matching the sunniest Septembers I have recorded. Let’s hope for more.