South Yarmouth Weather Forecast

    • 60
    • 74

    Becoming Sunny

    • 49
    • 74

    Mostly Sunny

    • 53
    • 66

    Mostly Sunny

    • 54
    • 69

    Partly Sunny

    • 59
    • 72

    Partly Sunny

    • 61
    • 76

    Partly Sunny

    • 57
    • 74

    Slight Chance Rain Showers

Today 18 Sep Barnstable

Partly sunny. Patchy fog. Near steady temperature in the lower 70s. North Winds around 5 Mph.

Tonight 18 Sep Barnstable

Partly cloudy this Evening, then becoming mostly clear. Patchy fog after midnight. Lows around 60. Southwest Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Yarmouth Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 13 September, 2025

    44.1 °F

  • Average September

    63.9 °F

  • Highest 6 September, 2025

    77 °F

Climate (2020–Present)

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    59.9 °F
Get WillyWeather+ to remove ads