Old Mystic Weather Forecast

    • 65
    • 84

    Slight Chance Thunderstorms

    • 63
    • 84

    Chance Rain Showers

    • 55
    • 82

    Mostly Sunny

    • 56
    • 80

    Mostly Sunny

    • 63
    • 78

    Chance Rain Showers

    • 61
    • 79

    Chance Rain Showers

Today 12 Aug Southern New London

Sunny. Highs in the lower 80s. North Winds 5 to 10 Mph, becoming southwest in the afternoon.

Tonight 12 Aug Southern New London

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 60s. West Winds around 5 Mph.

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Old Mystic Temperature Statistics

August Temperature

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

  • Lowest 5 August, 2026

    59 °F

  • Average August

    74.8 °F

  • Highest 7 August, 2026

    86 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    53.3 °F

  • Average High 2021–2026

    60.8 °F
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