Niantic River Mouth Weather Forecast

    • 62
    • 71

    Chance Rain Showers

    • 67
    • 79

    Chance Thunderstorms

    • 63
    • 84

    Mostly Sunny

    • 69
    • 83

    Chance Rain Showers

    • 68
    • 84

    Chance Rain Showers

    • 65
    • 86

    Mostly Sunny

Today 27 Jun Southern New London

Partly sunny. Highs in the lower 70s. East Winds 10 to 15 Mph.

Tonight 27 Jun Southern New London

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers with a slight chance of Thunderstorms after midnight. Patchy fog after midnight. Lows in the lower 60s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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Niantic River Mouth Temperature Statistics

June Temperature

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

  • Lowest 3 June, 2025

    47.6 °F

  • Average June

    68.2 °F

  • Highest 25 June, 2025

    93 °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

    61.2 °F
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