Groton Weather Forecast

    • 59
    • 70

    Chance Rain Showers

    • 62
    • 68

    Chance Rain Showers

    • 63
    • 72

    Chance Rain Showers

    • 55
    • 76

    Mostly Sunny

    • 54
    • 66

    Mostly Sunny

    • 57
    • 66

    Partly Sunny

Today 16 Sep Southern New London

Mostly cloudy this Morning, then becoming mostly sunny. Highs in the lower 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 16 Sep Southern New London

Mostly cloudy. Lows in the mid 50s. East Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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Groton Temperature Statistics

September Temperature

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

  • Lowest 9 September, 2025

    48 °F

  • Average September

    61.8 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

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