South Yarmouth Weather Forecast

    • 66
    • 83

    Rain Showers Likely

    • 65
    • 77

    Chance Rain Showers

    • 69
    • 79

    Rain Showers

    • 69
    • 81

    Chance Rain Showers

    • 64
    • 83

    Mostly Sunny

    • 64
    • 80

    Mostly Sunny

Today 20 Aug Barnstable

Mostly sunny. Highs in the lower 80s. West Winds around 5 Mph, becoming south this afternoon.

Tonight 20 Aug Barnstable

Cloudy. A chance of Showers in the Evening, then Showers likely after midnight. Humid with Lows in the mid 60s. West Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 70 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

    74.7 °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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