Rock Island Weather Forecast

    • 58
    • 72

    Partly Sunny

    • 60
    • 69

    Chance Rain Showers

    • 62
    • 67

    Chance Rain Showers

    • 63
    • 71

    Mostly Sunny

    • 55
    • 76

    Mostly Sunny

    • 53
    • 65

    Mostly Sunny

    • 58
    • 64

    Mostly Sunny

Today 15 Sep Southern New London

Mostly sunny. Highs in the upper 70s. Southeast Winds 5 to 10 Mph.

Tonight 15 Sep Southern New London

Partly cloudy. Lows in the mid 50s. East Winds around 5 Mph.

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Rock Island Temperature Statistics

September Temperature

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

  • Lowest 9 September, 2025

    48 °F

  • Average September

    61.7 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

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