Hammonasset Beach State Park Weather Forecast

    • 60
    • 82

    Rain Showers

    • 55
    • 69

    Rain Showers

    • 54
    • 74

    Mostly Sunny

    • 55
    • 73

    Chance Rain Showers

    • 56
    • 72

    Chance Rain Showers

    • 55
    • 78

    Partly Sunny

Today 6 Sep Southern New Haven

Partly sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the lower 80s. South Winds 10 to 15 Mph. Chance of rain 50 percent.

Tonight 6 Sep Southern New Haven

Showers and Thunderstorms in the Evening, then Showers with isolated Thunderstorms after midnight. Some Thunderstorms may be severe with heavy rainfall in the evening. Lows in the upper 50s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming north after midnight. Chance of rain 80 percent.

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Hammonasset Beach State Park Temperature Statistics

September Temperature

Chester, Chester Airport (8.1 miles)

  • Lowest 3 September, 2025

    51.8 °F

  • Average September

    64.8 °F

  • Highest 2 September, 2025

    77 °F

Climate (2020–Present)

Chester, Chester Airport (8.1 miles)

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    62.6 °F
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