Alton Weather Forecast

    • 71
    • 92

    Chance Thunderstorms

    • 71
    • 91

    Mostly Sunny

    • 67
    • 90

    Mostly Sunny

    • 67
    • 88

    Chance Rain Showers

    • 70
    • 87

    Chance Thunderstorms

    • 70
    • 88

    Chance Thunderstorms

Today 21 Aug Jefferson

Mostly sunny. A slight chance of Showers and Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the lower 90s. West Winds around 5 Mph. Chance of rain 30 percent.

Tonight 21 Aug Jefferson

Partly cloudy in the Evening, then clearing. Lows in the lower 70s. North Winds around 5 Mph in the Evening, becoming light and variable.

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Alton Temperature Statistics

August Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 4 August, 2026

    70.6 °F

  • Average August

    83.7 °F

  • Highest 17 August, 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

    76.2 °F
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