Old Mystic Weather Forecast

    • 55
    • 63

    Rain

    • 58
    • 68

    Rain Showers

    • 56
    • 67

    Rain Showers

    • 56
    • 70

    Mostly Cloudy

    • 58
    • 72

    Partly Sunny

    • 59
    • 73

    Partly Sunny

Today 26 Sep Southern New London

Rain with a slight chance of Thunderstorms. Very windy with Highs in the lower 60s. Northeast Winds 25 to 35 Mph with Gusts up to 50 Mph. Chance of rain 90 percent.

Tonight 26 Sep Southern New London

Rain with a slight chance of Thunderstorms. Very windy with Lows in the mid 50s. Northeast Winds 25 to 35 Mph with Gusts up to 50 Mph. Chance of rain near 100 percent.

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Old Mystic Temperature Statistics

September Temperature

Groton / New London, Groton / New London Airport (6.2 miles)

  • Lowest 24 September, 2026

    46.9 °F

  • Average September

    65.9 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

Groton / New London, Groton / New London Airport (6.2 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.7 °F
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