Sister Island Weather Forecast

    • 58
    • 66

    Rain Showers

    • 58
    • 74

    Mostly Sunny

    • 56
    • 71

    Partly Sunny

    • 55
    • 69

    Chance Rain Showers

    • 56
    • 66

    Chance Rain Showers

    • 57
    • 71

    Slight Chance Rain Showers

Today 18 Jun Coastal Cumberland

Showers with a chance of Thunderstorms. Some Thunderstorms may be severe with damaging Winds and Tornadoes. Highs in the lower 70s. South Winds around 20 Mph with Gusts up to 45 Mph. Chance of rain near 100 percent.

Tonight 18 Jun Coastal Cumberland

Partly cloudy with Showers likely with a chance of Thunderstorms in the Evening, then mostly clear after midnight. Some Thunderstorms may be severe with damaging Winds and Tornadoes. Lows in the upper 50s. South Winds 15 to 20 Mph with Gusts up to 40 Mph, becoming southwest around 10 Mph with Gusts up to 20 Mph after midnight. Chance of rain 70 percent.

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Sister Island Temperature Statistics

June Temperature

Portland, Portland International Jetport (17.4 miles)

  • Lowest 2 June, 2026

    41.6 °F

  • Average June

    66.3 °F

  • Highest 10 June, 2026

    86.6 °F

Climate (2021–2026)

Portland, Portland International Jetport (17.4 miles)

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  • Average Low 2021–2026

    40 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    57.2 °F
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