South Yarmouth Weather Forecast

    • 61
    • 83

    Chance Rain Showers

    • 53
    • 75

    Mostly Sunny

    • 65
    • 72

    Rain Showers

    • 63
    • 75

    Rain Showers

    • 60
    • 74

    Partly Sunny

    • 62
    • 73

    Partly Sunny

Today 10 Sep Barnstable

Mostly cloudy with a chance of Showers this Morning, then mostly sunny this afternoon. Highs in the lower 80s. Southwest Winds 15 to 20 Mph. Gusts up to 45 Mph, decreasing to 35 Mph this afternoon. Chance of rain 50 percent.

Tonight 10 Sep Barnstable

Mostly clear in the Evening, then becoming partly cloudy. Cooler with Lows around 60. West Winds 10 to 15 Mph, becoming northwest 5 to 10 Mph after midnight.

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South Yarmouth Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 6 September, 2026

    53.1 °F

  • Average September

    66.4 °F

  • Highest 4 September, 2026

    79 °F

Climate (2021–2026)

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

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  • Average Low 2021–2026

    44.7 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    59.3 °F
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