Mystic Weather Forecast

    • 57
    • 76

    Mostly Sunny

    • 54
    • 73

    Mostly Sunny

    • 58
    • 71

    Partly Sunny

    • 57
    • 73

    Slight Chance Rain Showers

    • 55
    • 72

    Partly Sunny

    • 55
    • 72

    Partly Sunny

Today 11 Sep Southern New London

Sunny. Highs in the upper 70s. Northwest Winds 5 to 10 Mph.

Tonight 11 Sep Southern New London

Mostly clear. Lows in the mid 50s. Southwest Winds around 5 Mph, becoming north after midnight.

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Mystic Temperature Statistics

September Temperature

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

  • Lowest 9 September, 2025

    48 °F

  • Average September

    61.7 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.7 °F

  • Average 2020–2025

    53.6 °F

  • Average High 2020–2025

    61.1 °F
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