Stonington Harbor Weather Forecast

    • 58
    • 75

    Becoming Sunny

    • 52
    • 80

    Mostly Sunny

    • 51
    • 69

    Mostly Sunny

    • 52
    • 67

    Partly Sunny

    • 58
    • 70

    Partly Sunny

    • 61
    • 75

    Partly Sunny

Today 18 Sep Southern New London

Patchy fog this morning. Mostly cloudy with a slight chance of Showers this Morning, then mostly sunny this afternoon. Highs in the upper 70s. North Winds around 5 Mph, becoming west this afternoon. Chance of rain 20 percent.

Tonight 18 Sep Southern New London

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

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Stonington Harbor Temperature Statistics

September Temperature

Westerly, Westerly State Airport (5.6 miles)

  • Lowest 4 September, 2025

    48 °F

  • Average September

    63.7 °F

  • Highest 6 September, 2025

    78.1 °F

Climate (2020–Present)

Westerly, Westerly State Airport (5.6 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    60.4 °F
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