Mystic Harbor - Spence Point Weather Forecast

    • 54
    • 77

    Mostly Sunny

    • 63
    • 73

    Rain Showers Likely

    • 63
    • 76

    Chance Rain Showers

    • 54
    • 76

    Mostly Sunny

    • 60
    • 70

    Partly Sunny

    • 62
    • 77

    Chance Rain Showers

Today 11 Sep Southern New London

Mostly sunny. Highs in the upper 70s. Northwest Winds 5 to 10 Mph, becoming west with Gusts up to 20 Mph this afternoon.

Tonight 11 Sep Southern New London

Clear. Lows in the mid 50s. Northwest Winds 5 to 10 Mph, becoming north after midnight.

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Mystic Harbor - Spence Point Temperature Statistics

September Temperature

Groton / New London, Groton / New London Airport (3.7 miles)

  • Lowest 7 September, 2026

    51.1 °F

  • Average September

    68.2 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

Groton / New London, Groton / New London Airport (3.7 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.8 °F
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