Mouse Island Weather Forecast

    • 45
    • 46

    Rain

    • 29
    • 54

    Rain

    • 35
    • 42

    Partly Sunny

    • 25
    • 46

    Partly Sunny

    • 24
    • 33

    Partly Sunny

    • 32
    • 40

    Chance Rain/Snow

    • 28
    • 42

    Partly Sunny

Today 18 Dec Southern New London

Sunny. Highs in the upper 40s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 18 Dec Southern New London

Cloudy. A slight chance of rain late this Evening, then rain after midnight. Not as cool with Lows in the lower 40s. East Winds 5 to 10 Mph, increasing to south 15 to 20 Mph with Gusts up to 35 Mph after midnight. Chance of rain 90 percent.

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Mouse Island Temperature Statistics

December Temperature

Groton / New London, Groton / New London Airport (3.1 miles)

  • Lowest 5 December, 2025

    12.9 °F

  • Average December

    31 °F

  • Highest 10 December, 2025

    48.9 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (3.1 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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