Flat Island Weather Forecast

    • 61
    • 64

    Rain Showers Likely

    • 61
    • 70

    Slight Chance Rain Showers

    • 61
    • 75

    Partly Sunny

    • 58
    • 78

    Chance Rain Showers

    • 57
    • 78

    Mostly Sunny

    • 58
    • 76

    Partly Sunny

Today 17 Aug Coastal Waldo

Mostly cloudy. Showers with a slight chance of Thunderstorms this Morning, then a chance of Showers this afternoon. Highs in the upper 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 80 percent.

Tonight 17 Aug Coastal Waldo

Cloudy. A chance of Showers in the Evening, then Showers likely after midnight. Patchy fog. Lows in the lower 60s. Light and variable Winds. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Island Temperature Statistics

August Temperature

Rockland, Knox County Regional Airport (18.6 miles)

  • Lowest 1 August, 2026

    55.9 °F

  • Average August

    70.1 °F

  • Highest 6 August, 2026

    86 °F

Climate (2021–2026)

Rockland, Knox County Regional Airport (18.6 miles)

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  • Average Low 2021–2026

    39.5 °F

  • Average 2021–2026

    47.6 °F

  • Average High 2021–2026

    54.9 °F
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