Rock Harbor Beach Weather Forecast

    • 66
    • 71

    Rain Showers Likely

    • 58
    • 68

    Partly Sunny

    • 52
    • 61

    Partly Sunny

    • 58
    • 65

    Rain Showers Likely

    • 57
    • 66

    Slight Chance Rain Showers

    • 56
    • 63

    Partly Sunny

    • 56
    • 63

    Partly Sunny

Today 17 Sep Barnstable

Mostly sunny. Near steady temperature in the lower 70s. Southwest Winds 5 to 10 Mph.

Tonight 17 Sep Barnstable

Mostly cloudy. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Humid with Lows in the mid 60s. Southwest Winds 10 to 15 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rock Harbor Beach Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (7.5 miles)

  • Lowest 15 September, 2026

    51.1 °F

  • Average September

    66.2 °F

  • Highest 10 September, 2026

    80.1 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (7.5 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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