Alton Weather Forecast

    • 70
    • 88

    Slight Chance Thunderstorms

    • 68
    • 88

    Slight Chance Thunderstorms

    • 69
    • 89

    Partly Sunny

    • 70
    • 89

    Partly Sunny

    • 71
    • 90

    Mostly Sunny

    • 72
    • 91

    Slight Chance Thunderstorms

Today 27 Aug Jefferson

Mostly cloudy with a slight chance of Thunderstorms. A chance of Showers, mainly this morning. Highs in the upper 80s. Light and variable Winds, becoming west around 5 Mph this afternoon. Chance of rain 30 percent.

Tonight 27 Aug Jefferson

A slight chance of Thunderstorms in the evening. Mostly cloudy with a slight chance of Showers. Patchy fog after midnight. Lows in the lower 70s. North Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 20 percent.

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Alton Temperature Statistics

August Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 25 August, 2026

    66.9 °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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