Alton Weather Forecast

    • 73
    • 96

    Slight Chance Thunderstorms

    • 72
    • 95

    Slight Chance Thunderstorms

    • 71
    • 91

    Slight Chance Thunderstorms

    • 70
    • 89

    Mostly Sunny

    • 70
    • 90

    Mostly Sunny

    • 71
    • 91

    Mostly Sunny

Today 5 Sep Jefferson

Sunny. A slight chance of Showers and Thunderstorms this afternoon. Hot with Highs in the upper 90s. North Winds around 5 Mph. Chance of rain 20 percent. Heat index Values up to 109.

Tonight 5 Sep Jefferson

Partly cloudy with a slight chance of Showers and Thunderstorms in the Evening, then mostly clear after midnight. Lows in the mid 70s. Southwest Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 20 percent.

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Alton Temperature Statistics

September Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 1 September, 2026

    73.7 °F

  • Average September

    86.8 °F

  • Highest 2 September, 2026

    99.6 °F

Climate (2021–2026)

Birmingham, Birmingham International Airport (6.2 miles)

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  • Average Low 2021–2026

    55.6 °F

  • Average 2021–2026

    65.7 °F

  • Average High 2021–2026

    76.3 °F
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