South Yarmouth Weather Forecast

    • 68
    • 81

    Rain Showers

    • 66
    • 80

    Mostly Sunny

    • 66
    • 76

    Mostly Sunny

    • 69
    • 79

    Chance Rain Showers

    • 66
    • 82

    Chance Rain Showers

    • 67
    • 79

    Mostly Sunny

Today 13 Aug Barnstable

Mostly cloudy with Showers likely with a slight chance of Thunderstorms this Morning, then mostly sunny with a chance of Showers with a slight chance of Thunderstorms this afternoon. Patchy fog this morning. Highs in the upper 70s. Southwest Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 13 Aug Barnstable

Mostly clear. Humid with Lows in the upper 60s. Northwest Winds 5 to 10 Mph.

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South Yarmouth Temperature Statistics

August Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 5 August, 2026

    60.1 °F

  • Average August

    76.5 °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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