Griswold Island Weather Forecast

    • 39
    • 54

    Gradual Clearing

    • 37
    • 51

    Chance Rain Showers

    • 30
    • 50

    Chance Rain Showers

    • 34
    • 45

    Mostly Sunny

    • 40
    • 49

    Partly Sunny

    • 46
    • 57

    Partly Sunny

    • 45
    • 61

    Partly Sunny

Today 5 Apr Southern New London

Rain with a slight chance of Thunderstorms. Patchy fog. Visibility one quarter mile or less at Times. Near steady temperature in the lower 50s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain near 100 percent.

Tonight 5 Apr Southern New London

Patchy fog in the evening. Showers in the Evening, then partly cloudy after midnight. Visibility one quarter mile or less at Times in the evening. Lows in the upper 30s. West Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain near 100 percent.

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Griswold Island Temperature Statistics

April Temperature

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

  • Lowest 3 April, 2026

    37.9 °F

  • Average April

    46.4 °F

  • Highest 1 April, 2026

    60.1 °F

Climate (2021–Present)

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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