Cohasset Weather Forecast

    • 55
    • 75

    Chance Rain Showers

    • 54
    • 64

    Mostly Sunny

    • 60
    • 76

    Partly Sunny

    • 61
    • 77

    Mostly Cloudy

    • 57
    • 75

    Partly Sunny

    • 57
    • 70

    Partly Sunny

Today 14 Sep Eastern Plymouth

Partly sunny with a slight chance of Showers and Thunderstorms in the Morning, then sunny in the afternoon. Highs in the lower 70s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 14 Sep Eastern Plymouth

Clear, cooler. Less humid with Lows in the lower 50s. North Winds 5 to 10 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cohasset Temperature Statistics

September Temperature

Marshfield Airport (11.8 miles)

  • Lowest 7 September, 2026

    53.6 °F

  • Average September

    67.5 °F

  • Highest 10 September, 2026

    87.8 °F

Climate (2021–2026)

Marshfield Airport (11.8 miles)

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  • Average Low 2021–2026

    44 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    60.2 °F
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