Alton Weather Forecast

    • 71
    • 93

    Chance Thunderstorms

    • 70
    • 93

    Chance Thunderstorms

    • 69
    • 92

    Chance Thunderstorms

    • 65
    • 87

    Slight Chance Thunderstorms

    • 61
    • 82

    Mostly Sunny

    • 61
    • 82

    Partly Sunny

    • 60
    • 82

    Partly Sunny

Today 20 Sep Jefferson

Mostly sunny with a chance of Showers and Thunderstorms. Near steady temperature in the lower 90s. Northeast Winds around 5 Mph. Chance of rain 30 percent.

Tonight 20 Sep Jefferson

Partly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the lower 70s. Southeast Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 30 percent.

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Alton Temperature Statistics

September Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 18 September, 2026

    71.1 °F

  • Average September

    85.7 °F

  • Highest 4 September, 2026

    102.7 °F

Climate (2021–2026)

Birmingham, Birmingham International Airport (6.2 miles)

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  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    65.8 °F

  • Average High 2021–2026

    76.4 °F
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