Alton Weather Forecast

    • 51
    • 76

    Mostly Cloudy

    • 57
    • 77

    Partly Sunny

    • 39
    • 68

    Mostly Sunny

    • 36
    • 64

    Sunny

    • 47
    • 70

    Mostly Sunny

    • 52
    • 75

    Partly Sunny

Today 17 Sep Southern Penobscot

Patchy fog this morning. Partly sunny. Highs in the mid 70s. South Winds 5 to 10 Mph.

Tonight 17 Sep Southern Penobscot

Partly cloudy this Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the lower 50s. South Winds 5 to 10 Mph.

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Alton Temperature Statistics

September Temperature

Bangor, Bangor International Airport (16.8 miles)

  • Lowest 11 September, 2025

    42.1 °F

  • Average September

    61.2 °F

  • Highest 1 September, 2025

    80.1 °F

Climate (2020–Present)

Bangor, Bangor International Airport (16.8 miles)

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  • Average Low 2020–2025

    38 °F

  • Average 2020–2025

    47.6 °F

  • Average High 2020–2025

    57.1 °F
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