Chatham Harbor - Tern Island Weather Forecast

    • 56
    • 64

    Mostly Cloudy

    • 56
    • 62

    Mostly Cloudy

    • 56
    • 62

    Slight Chance Rain Showers

    • 57
    • 63

    Chance Thunderstorms

    • 58
    • 63

    Rain Showers Likely

    • 58
    • 63

    Rain Showers Likely

    • 57
    • 62

    Chance Rain Showers

Today 22 Sep Barnstable

Mostly cloudy. Lows in the mid 50s. Highs in the mid 60s.

Tonight 22 Sep Barnstable

Mostly cloudy. Lows in the mid 50s. Northeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chatham Harbor - Tern Island Temperature Statistics

September Temperature

Chatham, Chatham Municipal Airport (1.9 miles)

  • Lowest 15 September, 2026

    51.1 °F

  • Average September

    65.6 °F

  • Highest 10 September, 2026

    80.1 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (1.9 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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