Rock Island Weather Forecast

    • 47
    • 57

    Rain Showers

    • 48
    • 56

    Partly Sunny

    • 49
    • 63

    Mostly Sunny

    • 55
    • 60

    Mostly Cloudy

    • 47
    • 67

    Partly Sunny

    • 48
    • 56

    Chance Rain Showers

Today 26 Apr Southern New London

Showers this Morning, then Showers likely with a slight chance of Thunderstorms this afternoon. Highs in the lower 60s. South Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain near 100 percent.

Tonight 26 Apr Southern New London

Cloudy with Showers likely with a slight chance of Thunderstorms in the Evening, then partly cloudy after midnight. Lows in the mid 40s. Southwest Winds 10 to 15 Mph, becoming west 5 to 10 Mph after midnight. Gusts up to 25 Mph. Chance of rain 60 percent.

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Rock Island Temperature Statistics

April Temperature

Groton / New London, Groton / New London Airport (5.6 miles)

  • Lowest 10 April, 2025

    27.8 °F

  • Average April

    47.8 °F

  • Highest 4 April, 2025

    70.6 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (5.6 miles)

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  • Average Low 2020–2025

    45.6 °F

  • Average 2020–2025

    53.4 °F

  • Average High 2020–2025

    61 °F
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