South Yarmouth Weather Forecast

    • 23
    • 46

    Increasing Clouds

    • 27
    • 34

    Partly Sunny

    • 30
    • 40

    Rain

    • 27
    • 38

    Mostly Cloudy

    • 32
    • 41

    Chance Rain

    • 27
    • 43

    Chance Rain

Today 21 Dec Barnstable

Sunny. Highs in the mid 40s. Temperature falling into the upper 30s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 21 Dec Barnstable

Partly cloudy. Lows in the mid 20s. Northwest Winds 15 to 20 Mph with Gusts up to 40 Mph.

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South Yarmouth Temperature Statistics

December Temperature

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

  • Lowest 15 December, 2025

    12.9 °F

  • Average December

    34.1 °F

  • Highest 19 December, 2025

    54 °F

Climate (2020–Present)

Hyannis, Barnstable Municipal-Boardman Airport (4.3 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    59.7 °F
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