Codman Island Weather Forecast

    • 26
    • 40

    Decreasing Clouds

    • 38
    • 45

    Mostly Cloudy

    • 21
    • 53

    Rain

    • 24
    • 34

    Chance Rain/Snow

    • 19
    • 39

    Slight Chance Snow

    • 14
    • 28

    Partly Sunny

Today 17 Dec Knox

Partly sunny. Highs around 40. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 17 Dec Knox

Mostly clear. Lows in the mid 20s. West Winds around 10 Mph with Gusts up to 25 Mph.

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Codman Island Temperature Statistics

December Temperature

Rockland, Knox County Regional Airport (11.2 miles)

  • Lowest 9 December, 2025

    -2 °F

  • Average December

    25.5 °F

  • Highest 10 December, 2025

    45 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (11.2 miles)

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  • Average Low 2020–2025

    39.9 °F

  • Average 2020–2025

    47.9 °F

  • Average High 2020–2025

    55.2 °F
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