Black Rock Weather Forecast

    • 62
    • 69

    Rain Showers Likely

    • 63
    • 72

    Chance Rain Showers

    • 54
    • 76

    Mostly Sunny

    • 55
    • 66

    Mostly Sunny

    • 57
    • 66

    Partly Sunny

    • 61
    • 69

    Partly Sunny

Today 17 Sep Southern New London

Partly sunny with a slight chance of Showers this Morning, then mostly cloudy with a chance of Showers this afternoon. Highs in the lower 70s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

Tonight 17 Sep Southern New London

Mostly cloudy with a chance of Showers with isolated Thunderstorms. Lows in the upper 50s. Northeast Winds 5 to 10 Mph. Chance of rain 50 percent.

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Black Rock Temperature Statistics

September Temperature

Groton / New London, Groton / New London Airport (1.2 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 (1.2 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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