Saco River - Thunder Island Weather Forecast

    • 59
    • 71

    Rain Showers

    • 45
    • 79

    Mostly Sunny

    • 46
    • 66

    Chance Rain Showers

    • 47
    • 65

    Chance Rain Showers

    • 46
    • 66

    Slight Chance Rain Showers

    • 44
    • 61

    Slight Chance Rain Showers

    • 44
    • 62

    Partly Sunny

Today 17 Sep Coastal York

Mostly cloudy with a 50 percent chance of Showers. Highs in the lower 70s. Light and variable Winds.

Tonight 17 Sep Coastal York

A slight chance of Thunderstorms. Showers. Patchy fog. Lows around 60. Light and variable Winds. Chance of rain 90 percent.

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Saco River - Thunder Island Temperature Statistics

September Temperature

Portland, Portland International Jetport (12.4 miles)

  • Lowest 12 September, 2026

    43.6 °F

  • Average September

    64.6 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Portland, Portland International Jetport (12.4 miles)

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  • Average Low 2021–2026

    40 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    57.3 °F
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