South Yarmouth Weather Forecast

    • 70
    • 80

    Chance Rain Showers

    • 66
    • 80

    Mostly Cloudy

    • 65
    • 75

    Partly Sunny

    • 67
    • 80

    Slight Chance Thunderstorms

    • 65
    • 79

    Slight Chance Rain Showers

    • 65
    • 76

    Chance Rain Showers

Today 27 Aug Barnstable

Mostly sunny. Highs in the upper 70s. South Winds 10 to 15 Mph.

Tonight 27 Aug Barnstable

Mostly cloudy. A slight chance of Showers after midnight. Humid with Lows around 70. South Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 20 percent.

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South Yarmouth Temperature Statistics

August Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 16 August, 2026

    55.9 °F

  • Average August

    73.8 °F

  • Highest 7 August, 2026

    88 °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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