South Yarmouth Weather Forecast

    • 65
    • 77

    Chance Thunderstorms

    • 62
    • 79

    Slight Chance Rain Showers

    • 59
    • 72

    Partly Sunny

    • 59
    • 70

    Mostly Sunny

    • 61
    • 73

    Mostly Sunny

    • 62
    • 75

    Partly Sunny

Today 3 Sep Barnstable

Mostly cloudy. Showers likely with a chance of Thunderstorms, then a chance of Showers and Thunderstorms. Patchy fog. Near steady temperature in the lower 70s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 3 Sep Barnstable

Mostly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Patchy fog. Visibility one quarter mile or less at Times after midnight. Humid with Lows in the mid 60s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming west after midnight. Chance of rain 20 percent.

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South Yarmouth Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 1 September, 2026

    60.1 °F

  • Average September

    65 °F

  • Highest 1 September, 2026

    71.1 °F

Climate (2021–2026)

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

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  • Average Low 2021–2026

    44.8 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    59.3 °F
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