Dennis Port Weather Forecast

    • 63
    • 78

    Becoming Sunny

    • 60
    • 71

    Partly Sunny

    • 60
    • 69

    Mostly Sunny

    • 61
    • 71

    Mostly Sunny

    • 60
    • 74

    Partly Sunny

    • 63
    • 73

    Mostly Cloudy

Today 4 Sep Barnstable

Mostly sunny. Patchy fog. Highs in the upper 70s. North Winds around 5 Mph.

Tonight 4 Sep Barnstable

Partly cloudy in the Evening, then clearing. Humid with Lows in the mid 60s. Southwest Winds around 5 Mph, becoming northwest after midnight.

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Dennis Port Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (6.8 miles)

  • Lowest 1 September, 2026

    63 °F

  • Average September

    66.1 °F

  • Highest 2 September, 2026

    72 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (6.8 miles)

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    59.7 °F
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