Flat Island Weather Forecast

    • 8
    • 37

    Gradual Clearing

    • 19
    • 24

    Partly Sunny

    • 26
    • 36

    Rain/Snow

    • 17
    • 33

    Snow Showers

    • 11
    • 24

    Mostly Sunny

    • 23
    • 30

    Chance Snow

Today 4 Dec Coastal Waldo

Mostly cloudy. A slight chance of snow Showers this Morning, then a chance of snow Showers this afternoon. Highs in the mid 30s. Temperatures falling into the mid 20s this afternoon. West Winds around 10 Mph with Gusts up to 25 Mph, becoming northwest with Gusts up to 35 Mph this afternoon. Chance of snow 30 percent.

Tonight 4 Dec Coastal Waldo

Mostly clear. Lows around 4 above. Northwest Winds 10 to 15 Mph with Gusts up to 40 Mph. Wind chill Values as low as 10 below.

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Flat Island Temperature Statistics

December Temperature

Rockland, Knox County Regional Airport (18.6 miles)

  • Lowest 2 December, 2025

    21 °F

  • Average December

    33.1 °F

  • Highest 1 December, 2025

    41 °F

Climate (2020–Present)

Rockland, Knox County Regional Airport (18.6 miles)

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  • Average Low 2020–2025

    40 °F

  • Average 2020–2025

    48 °F

  • Average High 2020–2025

    55.2 °F
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