Thames River - Green Harbor Weather Forecast

    • 61
    • 72

    Mostly Sunny

    • 66
    • 74

    Chance Rain Showers

    • 66
    • 74

    Rain Showers

    • 63
    • 73

    Rain Showers Likely

    • 64
    • 78

    Chance Rain Showers

    • 66
    • 82

    Slight Chance Thunderstorms

    • 68
    • 84

    Slight Chance Rain Showers

Today 26 Jul Southern New London

Sunny. Near steady temperature in the upper 70s. Southeast Winds around 5 Mph.

Tonight 26 Jul Southern New London

Mostly clear. Lows in the upper 50s. Southeast Winds around 5 Mph in the Evening, becoming light and variable.

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Thames River - Green Harbor Temperature Statistics

July Temperature

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

  • Lowest 20 July, 2026

    57 °F

  • Average July

    72.5 °F

  • Highest 3 July, 2026

    91 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.8 °F
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