Thames River - New London Weather Forecast

    • 59
    • 69

    Chance Rain Showers

    • 62
    • 68

    Rain Showers Likely

    • 63
    • 71

    Chance Rain Showers

    • 54
    • 75

    Mostly Sunny

    • 53
    • 65

    Mostly Sunny

    • 56
    • 65

    Partly Sunny

    • 60
    • 69

    Partly Sunny

Today 16 Sep Southern New London

Partly sunny. Highs in the lower 70s. East Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 16 Sep Southern New London

Mostly cloudy. A slight chance of Showers after midnight. Lows in the mid 50s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

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Thames River - New London Temperature Statistics

September Temperature

Groton / New London, Groton / New London Airport (3.1 miles)

  • Lowest 9 September, 2025

    48 °F

  • Average September

    61.8 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (3.1 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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