Alton Weather Forecast

    • 65
    • 88

    Chance Thunderstorms

    • 60
    • 81

    Becoming Sunny

    • 58
    • 82

    Mostly Sunny

    • 59
    • 83

    Partly Sunny

    • 59
    • 85

    Partly Sunny

    • 61
    • 86

    Slight Chance Rain Showers

    • 65
    • 88

    Partly Sunny

Today 23 Sep Jefferson

Partly sunny with a chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 40 percent.

Tonight 23 Sep Jefferson

Partly cloudy this Evening, then becoming mostly cloudy. A 20 percent chance of Showers. Lows in the upper 60s. Northeast Winds 5 to 10 Mph, becoming east after midnight.

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Alton Temperature Statistics

September Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 13 September, 2026

    71.7 °F

  • Average September

    85.5 °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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