Colchester Weather Forecast

    • 58
    • 79

    Becoming Sunny

    • 49
    • 80

    Mostly Sunny

    • 46
    • 71

    Mostly Sunny

    • 48
    • 70

    Partly Sunny

    • 56
    • 74

    Partly Sunny

    • 59
    • 81

    Partly Sunny

Today 18 Sep Northern New London

Sunny. Highs in the upper 70s. West Winds around 5 Mph.

Tonight 18 Sep Northern New London

Clear. Lows in the upper 50s. West Winds around 5 Mph.

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Colchester Temperature Statistics

September Temperature

Willimantic, Windham Airport (13.7 miles)

  • Lowest 9 September, 2025

    45 °F

  • Average September

    63.3 °F

  • Highest 5 September, 2025

    81 °F

Climate (2020–Present)

Willimantic, Windham Airport (13.7 miles)

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  • Average Low 2020–2025

    41.7 °F

  • Average 2020–2025

    51.8 °F

  • Average High 2020–2025

    61.9 °F
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