Alton Weather Forecast

    • 72
    • 92

    Slight Chance Rain Showers

    • 73
    • 94

    Mostly Sunny

    • 73
    • 94

    Chance Thunderstorms

    • 71
    • 90

    Chance Thunderstorms

    • 71
    • 91

    Mostly Sunny

    • 70
    • 91

    Mostly Sunny

Today 18 Aug Jefferson

Sunny with Highs in the mid 90s. Northwest Winds 5 to 10 Mph. Heat index Values up to 105.

Tonight 18 Aug Jefferson

Partly cloudy. Near steady temperature in the upper 70s. West Winds around 5 Mph.

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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

    83.2 °F

  • Highest 13 August, 2026

    96.7 °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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