Thames River - Green Harbor Weather Forecast

    • 51
    • 60

    Mostly Sunny

    • 60
    • 65

    Rain Showers Likely

    • 52
    • 63

    Rain Showers

    • 56
    • 62

    Chance Rain Showers

    • 49
    • 61

    Chance Rain Showers

    • 47
    • 57

    Partly Sunny

Today 18 Oct Southern New London

Patchy frost this morning. Sunny. Highs in the lower 60s. North Winds around 5 Mph, becoming southwest this afternoon.

Tonight 18 Oct Southern New London

Mostly clear. Lows in the upper 40s. South Winds around 5 Mph.

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Thames River - Green Harbor Temperature Statistics

October Temperature

Groton / New London, Groton / New London Airport (2.5 miles)

  • Lowest 10 October, 2025

    33.1 °F

  • Average October

    54.9 °F

  • Highest 4 October, 2025

    71.1 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (2.5 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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