Saco River - Thunder Island Weather Forecast

    • 34
    • 46

    Rain

    • 22
    • 55

    Rain

    • 26
    • 38

    Slight Chance Rain/Snow

    • 17
    • 45

    Slight Chance Rain

    • 12
    • 28

    Mostly Sunny

    • 22
    • 35

    Chance Rain/Snow

Today 18 Dec Coastal York

Mostly sunny. Highs in the mid 40s. Light and variable Winds.

Tonight 18 Dec Coastal York

Partly cloudy with a slight chance of rain in the Evening, then cloudy with rain likely after midnight. Lows in the mid 30s. Temperatures rising into the mid 40s after midnight. South Winds around 10 Mph. Gusts up to 25 Mph after midnight. Chance of rain 70 percent.

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Saco River - Thunder Island Temperature Statistics

December Temperature

Portland, Portland International Jetport (12.4 miles)

  • Lowest 9 December, 2025

    -0.9 °F

  • Average December

    23.9 °F

  • Highest 1 December, 2025

    39 °F

Climate (2020–Present)

Portland, Portland International Jetport (12.4 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    57.3 °F
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