Niantic River Mouth Weather Forecast

    • 60
    • 77

    Rain Showers

    • 44
    • 71

    Rain Showers

    • 38
    • 60

    Sunny

    • 45
    • 62

    Mostly Sunny

    • 47
    • 66

    Mostly Cloudy

    • 49
    • 65

    Chance Rain Showers

    • 49
    • 64

    Slight Chance Rain Showers

Today 7 Oct Southern New London

Mostly sunny. Highs in the mid 70s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 7 Oct Southern New London

Mostly cloudy. A chance of Showers after midnight. Lows around 60. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 50 percent.

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Niantic River Mouth Temperature Statistics

October Temperature

Groton / New London, Groton / New London Airport (6.2 miles)

  • Lowest 3 October, 2025

    39 °F

  • Average October

    55.8 °F

  • Highest 4 October, 2025

    71.1 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (6.2 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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