Alton Weather Forecast

    • 75
    • 93

    Chance Thunderstorms

    • 74
    • 93

    Chance Thunderstorms

    • 73
    • 92

    Chance Thunderstorms

    • 73
    • 90

    Chance Thunderstorms

    • 73
    • 89

    Thunderstorms Likely

    • 73
    • 89

    Chance Thunderstorms

Today 3 Jul Jefferson

Mostly sunny. A slight chance of Showers and Thunderstorms this Morning, then a chance of Showers and Thunderstorms this afternoon. Highs in the mid 90s. Light and variable Winds, becoming southeast around 5 Mph this afternoon. Chance of rain 40 percent. Heat index Values up to 105.

Tonight 3 Jul Jefferson

Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the mid 70s. Northeast Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 40 percent.

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Alton Temperature Statistics

July Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 1 July, 2026

    75 °F

  • Average July

    81.8 °F

  • Highest 1 July, 2026

    93 °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

    65.5 °F

  • Average High 2021–2026

    76.1 °F
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