Chatham Bar Weather Forecast

    • 64
    • 66

    Rain Showers Likely

    • 65
    • 68

    Rain Showers Likely

    • 60
    • 70

    Mostly Sunny

    • 58
    • 62

    Mostly Sunny

    • 60
    • 63

    Partly Sunny

    • 64
    • 66

    Partly Sunny

Today 17 Sep Barnstable

Partly sunny. A slight chance of Showers in the afternoon. Highs in the lower 70s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 17 Sep Barnstable

Showers likely. Lows in the lower 60s. East Winds 5 to 10 Mph. Chance of rain 70 percent.

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Chatham Bar Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (3.7 miles)

  • Lowest 13 September, 2025

    46.9 °F

  • Average September

    64.6 °F

  • Highest 6 September, 2025

    79 °F

Climate (2020–Present)

Chatham, Chatham Municipal Airport (3.7 miles)

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  • Average Low 2020–2025

    47.7 °F

  • Average 2020–2025

    54 °F

  • Average High 2020–2025

    60.1 °F
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