Griswold Island Weather Forecast

    • 59
    • 78

    Partly Sunny

    • 58
    • 77

    Mostly Sunny

    • 62
    • 78

    Mostly Sunny

    • 66
    • 80

    Chance Rain Showers

    • 67
    • 75

    Rain Showers Likely

    • 66
    • 77

    Chance Rain Showers

Today 24 Jul Southern New London

Sunny. Highs around 80. East Winds around 5 Mph, becoming south this afternoon.

Tonight 24 Jul Southern New London

Partly cloudy. Lows in the upper 50s. Southeast Winds 5 to 10 Mph, becoming northeast after midnight.

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Griswold Island Temperature Statistics

July Temperature

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

  • Lowest 20 July, 2026

    57 °F

  • Average July

    72.9 °F

  • Highest 3 July, 2026

    91 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.8 °F
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