South Lyme Weather Forecast

    • 60
    • 78

    Sunny

    • 53
    • 82

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 51
    • 69

    Partly Sunny

    • 59
    • 73

    Partly Sunny

    • 61
    • 78

    Slight Chance Rain Showers

    • 58
    • 78

    Slight Chance Rain Showers

Today 18 Sep Southern New London

Sunny. Highs in the upper 70s. Southwest Winds 5 to 10 Mph.

Tonight 18 Sep Southern New London

Clear. Lows in the upper 50s. West Winds around 5 Mph.

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South Lyme Temperature Statistics

September Temperature

Groton / New London, Groton / New London Airport (10.6 miles)

  • Lowest 9 September, 2025

    48 °F

  • Average September

    61.9 °F

  • Highest 6 September, 2025

    75.9 °F

Climate (2020–Present)

Groton / New London, Groton / New London Airport (10.6 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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