Griswold Island Weather Forecast

    • 62
    • 73

    Increasing Clouds

    • 66
    • 77

    Mostly Cloudy

    • 54
    • 77

    Partly Sunny

    • 57
    • 67

    Mostly Cloudy

    • 59
    • 70

    Rain Showers Likely

    • 58
    • 70

    Chance Rain Showers

Today 16 Sep Southern New London

Mostly sunny. Highs in the lower 70s. Southwest Winds 5 to 10 Mph.

Tonight 16 Sep Southern New London

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows around 60. Southwest Winds around 5 Mph.

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Griswold Island Temperature Statistics

September Temperature

Groton / New London, Groton / New London Airport (9.3 miles)

  • Lowest 7 September, 2026

    51.1 °F

  • Average September

    68.4 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

Groton / New London, Groton / New London Airport (9.3 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.8 °F
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