Flag Island Weather Forecast

    • 49
    • 61

    Partly Sunny

    • 61
    • 67

    Partly Sunny

    • 49
    • 72

    Slight Chance Thunderstorms

    • 46
    • 58

    Partly Sunny

    • 47
    • 58

    Mostly Cloudy

    • 46
    • 55

    Mostly Cloudy

Today 18 May Coastal Cumberland

Partly sunny. Highs in the mid 60s. South Winds around 10 Mph.

Tonight 18 May Coastal Cumberland

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 40s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flag Island Temperature Statistics

May Temperature

Wiscasset Airport (16.8 miles)

  • Lowest 4 May, 2026

    33.1 °F

  • Average May

    52.5 °F

  • Highest 16 May, 2026

    73 °F

Climate (2021–Present)

Wiscasset Airport (16.8 miles)

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  • Average Low 2021–2026

    38.7 °F

  • Average 2021–2026

    48.4 °F

  • Average High 2021–2026

    57.8 °F
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