Dennis Port Weather Forecast

    • 55
    • 75

    Partly Sunny

    • 45
    • 64

    Partly Sunny

    • 58
    • 67

    Rain Showers Likely

    • 54
    • 66

    Chance Rain Showers

    • 55
    • 65

    Chance Rain Showers

    • 55
    • 65

    Slight Chance Rain

Today 18 Sep Barnstable

Mostly cloudy with a 40 percent chance of Showers. Breezy. Lows in the mid 50s. Highs in the mid 60s.

Tonight 18 Sep Barnstable

Partly cloudy. Cooler with Lows in the mid 50s. North Winds 10 to 15 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Dennis Port Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (6.8 miles)

  • Lowest 15 September, 2026

    51.1 °F

  • Average September

    66 °F

  • Highest 10 September, 2026

    80.1 °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

    53.6 °F

  • Average High 2021–2026

    59.7 °F
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