Alton Weather Forecast

    • 56
    • 83

    Mostly Sunny

    • 56
    • 84

    Mostly Sunny

    • 61
    • 89

    Sunny

    • 67
    • 90

    Partly Sunny

    • 69
    • 89

    Partly Sunny

    • 68
    • 86

    Chance Rain Showers

Today 27 Sep Jefferson

Mostly sunny. Highs in the mid 80s. North Winds 5 to 10 Mph.

Tonight 27 Sep Jefferson

Partly cloudy in the Evening, then becoming mostly clear. Lows in the upper 50s. North Winds around 5 Mph.

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Alton Temperature Statistics

September Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 24 September, 2026

    66 °F

  • Average September

    84.8 °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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