Black Rock Weather Forecast

    • 53
    • 66

    Partly Sunny

    • 53
    • 67

    Mostly Cloudy

    • 56
    • 63

    Rain Showers Likely

    • 56
    • 62

    Rain Showers Likely

    • 56
    • 63

    Chance Rain Showers

    • 55
    • 65

    Partly Sunny

    • 56
    • 68

    Mostly Sunny

Today 23 Sep Southern New London

Mostly sunny. Highs around 70.

Tonight 23 Sep Southern New London

Partly cloudy this Evening, then clearing. Lows in the upper 40s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Black Rock Temperature Statistics

September Temperature

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

  • Lowest 15 September, 2026

    50 °F

  • Average September

    67.2 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    60.7 °F
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