South Dennis Weather Forecast

    • 60
    • 74

    Chance Rain Showers

    • 51
    • 75

    Mostly Sunny

    • 50
    • 68

    Mostly Sunny

    • 54
    • 69

    Partly Sunny

    • 58
    • 73

    Partly Sunny

    • 59
    • 76

    Partly Sunny

Today 18 Sep Barnstable

Mostly cloudy with a slight chance of Showers and Thunderstorms this Morning, then partly sunny this afternoon. Patchy fog. Highs in the mid 70s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 18 Sep Barnstable

Partly cloudy in the Evening, then becoming mostly clear. Patchy fog. Lows in the lower 60s. Southwest Winds 5 to 10 Mph.

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  • Temperature Real-Time

South Dennis Temperature Statistics

September Temperature

Hyannis, Barnstable Municipal-Boardman Airport (6.2 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 (6.2 miles)

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  • Average Low 2020–2025

    45.3 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    59.9 °F
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