Flat Island Weather Forecast

    • 52
    • 57

    Rain

    • 51
    • 60

    Chance Rain Showers

    • 52
    • 65

    Mostly Cloudy

    • 58
    • 67

    Partly Sunny

Today 28 Sep Coastal Waldo

Rain. Patchy fog this morning. Patchy fog this afternoon. Highs in the upper 50s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

Tonight 28 Sep Coastal Waldo

Rain. Patchy fog. Lows around 50. Northeast Winds around 10 Mph. Chance of rain 80 percent.

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  • Temperature Real-Time

Flat Island Temperature Statistics

September Temperature

Rockland, Knox County Regional Airport (18.6 miles)

  • Lowest 24 September, 2026

    37 °F

  • Average September

    59.6 °F

  • Highest 10 September, 2026

    84 °F

Climate (2021–2026)

Rockland, Knox County Regional Airport (18.6 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    54.8 °F
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