Alton Weather Forecast

    • 44
    • 75

    Mostly Sunny

    • 49
    • 71

    Partly Sunny

    • 64
    • 85

    Chance Rain Showers

    • 48
    • 84

    Chance Thunderstorms

    • 41
    • 62

    Partly Sunny

    • 43
    • 64

    Partly Sunny

Today 17 May Southern Penobscot

Sunny. Highs in the mid 70s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 17 May Southern Penobscot

Clear in the Evening, then becoming partly cloudy. Lows in the mid 40s. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph, Diminishing to around 5 Mph with Gusts up to 15 Mph after midnight.

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Alton Temperature Statistics

May Temperature

Bangor, Bangor International Airport (16.8 miles)

  • Lowest 2 May, 2026

    30.7 °F

  • Average May

    49 °F

  • Highest 5 May, 2026

    68.6 °F

Climate (2021–Present)

Bangor, Bangor International Airport (16.8 miles)

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  • Average Low 2021–2026

    37.3 °F

  • Average 2021–2026

    47.1 °F

  • Average High 2021–2026

    56.7 °F
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