Flat Island Weather Forecast

    • 11
    • 32

    Decreasing Clouds

    • 10
    • 18

    Increasing Clouds

    • 15
    • 21

    Partly Sunny

    • 24
    • 33

    Chance Rain/Snow

    • 22
    • 40

    Rain

    • 17
    • 26

    Mostly Cloudy

    • 16
    • 30

    Chance Snow Showers

Today 25 Dec Coastal Waldo

Partly sunny. Highs in the lower 30s. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 25 Dec Coastal Waldo

Partly cloudy this Evening, then clearing. Lows around 6 above. Northwest Winds 10 to 15 Mph with Gusts up to 35 Mph. Wind chill Values as low as 6 below after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Island Temperature Statistics

December Temperature

Rockland, Knox County Regional Airport (18.6 miles)

  • Lowest 9 December, 2025

    -2 °F

  • Average December

    28.1 °F

  • Highest 19 December, 2025

    54 °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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