Flat Island Weather Forecast

    • 19
    • 39

    Partly Sunny

    • 21
    • 28

    Blustery

    • 24
    • 34

    Chance Snow

    • 17
    • 29

    Chance Snow

    • 15
    • 23

    Snow Showers

    • 21
    • 29

    Mostly Cloudy

Today 11 Dec Coastal Waldo

Mostly cloudy Early, then becoming partly sunny. Scattered Flurries. Highs in the mid 30s. Temperatures falling into the lower 20s. West Winds 10 to 15 Mph. Gusts up to 30 Mph, increasing to 40 Mph.

Tonight 11 Dec Coastal Waldo

Partly cloudy. Lows around 14. West Winds 10 to 15 Mph with Gusts up to 40 Mph. Wind chill Values as low as 2 below.

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Flat Island Temperature Statistics

December Temperature

Rockland, Knox County Regional Airport (18.6 miles)

  • Lowest 9 December, 2025

    -2 °F

  • Average December

    23.9 °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

    39.9 °F

  • Average 2020–2025

    47.9 °F

  • Average High 2020–2025

    55.2 °F
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