Groton Weather Forecast

    • 31
    • 44

    Mostly Sunny

    • 46
    • 53

    Rain

    • 30
    • 56

    Rain

    • 36
    • 42

    Mostly Cloudy

    • 29
    • 46

    Partly Sunny

    • 27
    • 36

    Partly Sunny

Today 17 Dec Southern New London

Sunny. Highs in the mid 40s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 17 Dec Southern New London

Mostly clear. Lows in the mid 20s. West Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight.

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Groton Temperature Statistics

December Temperature

Groton / New London, Groton / New London Airport (1.9 miles)

  • Lowest 5 December, 2025

    12.9 °F

  • Average December

    31.9 °F

  • Highest 10 December, 2025

    48.9 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (1.9 miles)

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    53.4 °F

  • Average High 2020–2025

    61 °F
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