Sister Island Weather Forecast

    • 29
    • 36

    Slight Chance Snow Showers

    • 34
    • 42

    Rain Likely

    • 33
    • 45

    Chance Rain

    • 29
    • 43

    Chance Rain/Snow

    • 24
    • 37

    Slight Chance Snow

    • 26
    • 37

    Partly Sunny

Today 19 Mar Coastal Cumberland

Mostly cloudy with a slight chance of snow Showers this Morning, then partly sunny this afternoon. Highs in the upper 30s. Light and variable Winds, becoming south around 10 Mph with Gusts up to 20 Mph this afternoon. Chance of snow 20 percent.

Tonight 19 Mar Coastal Cumberland

Partly cloudy. Lows in the mid 20s. Light and variable Winds.

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  • Temperature Real-Time

Sister Island Temperature Statistics

March Temperature

Portland, Portland International Jetport (17.4 miles)

  • Lowest 2 March, 2026

    4.6 °F

  • Average March

    35 °F

  • Highest 10 March, 2026

    66 °F

Climate (2021–Present)

Portland, Portland International Jetport (17.4 miles)

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  • Average Low 2021–2026

    40.2 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    57.2 °F
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