Mystic Weather Forecast

    • 20
    • 28

    Partly Sunny

    • 25
    • 34

    Partly Sunny

    • 27
    • 44

    Partly Sunny

    • 44
    • 52

    Rain

    • 21
    • 51

    Slight Chance Rain

    • 34
    • 41

    Chance Rain

Today 15 Dec Southern New London

Partly sunny. A slight chance of snow Showers in the afternoon. Cold with Highs in the upper 20s. Northwest Winds 15 to 20 Mph. Chance of snow 20 percent. Wind chill Values as low as 3 below in the morning.

Tonight 15 Dec Southern New London

Mostly cloudy with a 20 percent chance of snow Showers. Lows around 20. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Mystic Temperature Statistics

December Temperature

Groton / New London, Groton / New London Airport (4.3 miles)

  • Lowest 5 December, 2025

    12.9 °F

  • Average December

    32.1 °F

  • Highest 10 December, 2025

    48.9 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (4.3 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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