Chatham Harbor - Tern Island Weather Forecast

    • 33
    • 47

    Decreasing Clouds

    • 41
    • 49

    Chance Rain

    • 28
    • 54

    Rain

    • 33
    • 43

    Mostly Cloudy

    • 24
    • 47

    Slight Chance Rain

    • 24
    • 34

    Partly Sunny

    • 29
    • 41

    Chance Rain/Snow

Today 17 Dec Barnstable

Partly sunny. Near steady temperature in the mid 40s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 17 Dec Barnstable

Mostly clear. Lows in the lower 30s. West Winds 10 to 15 Mph. Gusts up to 30 Mph, decreasing to 20 Mph after midnight.

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Chatham Harbor - Tern Island Temperature Statistics

December Temperature

Chatham, Chatham Municipal Airport (1.9 miles)

  • Lowest 15 December, 2025

    18 °F

  • Average December

    33.7 °F

  • Highest 2 December, 2025

    50 °F

Climate (2020–Present)

Chatham, Chatham Municipal Airport (1.9 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    53.9 °F

  • Average High 2020–2025

    59.9 °F
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