Chilly start Monday in Connecticut on first day of autumn

Autumn begins Monday, and with it comes a noticeable shift in Connecticut’s weather.

Jonathan Cubit

Sep 21, 2025, 9:55 PM

Updated 19 min ago

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Monday starts off chilly near 50 degrees but warms into the mid- to-upper 70s. Tuesday brings mostly cloudy skies and warmth near 80 with evening thunderstorms possible.
Monday: Mostly sunny, milder and tranquil. Highs near 73. Lows near 56.
Tuesday: Sun then clouds. Showers & thunderstorm chance. Highs near 80. Lows near 61.
Wednesday: Partly sunny. Spotty showers. Highs near 78. Lows near 60.
Thursday: Mostly Cloudy. Shower chance High around 72
Friday: Mostly Cloudy, shower chance. High of 73