Chatham Weather Forecast

    • 58
    • 65

    Mostly Sunny

    • 65
    • 68

    Mostly Sunny

    • 63
    • 70

    Chance Rain Showers

    • 60
    • 72

    Partly Sunny

    • 59
    • 68

    Chance Rain Showers

    • 59
    • 71

    Chance Rain Showers

Today 15 Sep Barnstable

Sunny. Highs in the upper 60s. Northeast Winds 5 to 10 Mph.

Tonight 15 Sep Barnstable

Clear, cooler. Near steady temperature in the mid 50s. Northeast Winds 10 to 15 Mph.

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Chatham Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (1.2 miles)

  • Lowest 12 September, 2026

    54 °F

  • Average September

    66.7 °F

  • Highest 10 September, 2026

    80.1 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (1.2 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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