Alton Weather Forecast

    • 24
    • 40

    Mostly Sunny

    • 30
    • 50

    Sunny

    • 37
    • 56

    Partly Sunny

    • 50
    • 57

    Rain Showers

    • 40
    • 61

    Partly Sunny

    • 41
    • 58

    Partly Sunny

Today 30 Dec Jefferson

Sunny. Highs in the lower 40s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 30 Dec Jefferson

Mostly clear. Cold with Lows in the mid 20s. West Winds around 5 Mph.

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Alton Temperature Statistics

December Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 15 December, 2025

    15.1 °F

  • Average December

    47.9 °F

  • Highest 24 December, 2025

    78.1 °F

Climate (2020–Present)

Birmingham, Birmingham International Airport (6.2 miles)

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  • Average Low 2020–2025

    55.4 °F

  • Average 2020–2025

    65.2 °F

  • Average High 2020–2025

    75.7 °F
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