South Yarmouth Weather Forecast

    • 64
    • 75

    Rain Showers Likely

    • 53
    • 73

    Partly Sunny

    • 49
    • 65

    Partly Sunny

    • 55
    • 68

    Rain Showers Likely

    • 55
    • 68

    Chance Rain Showers

    • 54
    • 67

    Chance Rain Showers

Today 17 Sep Barnstable

Mostly sunny. Near steady temperature in the lower 70s. Southwest Winds 5 to 10 Mph.

Tonight 17 Sep Barnstable

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Humid with Lows in the mid 60s. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Yarmouth Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 15 September, 2026

    48 °F

  • Average September

    66.9 °F

  • Highest 10 September, 2026

    82 °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

    52.3 °F

  • Average High 2021–2026

    59.3 °F
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