Alton Weather Forecast

    • 70
    • 79

    Rain Showers

    • 67
    • 84

    Chance Thunderstorms

    • 69
    • 85

    Rain Showers Likely

    • 73
    • 85

    Rain Showers

    • 70
    • 86

    Thunderstorms Likely

    • 68
    • 85

    Chance Thunderstorms

Today 18 Jun Jefferson

Showers with a slight chance of Thunderstorms this Morning, then Showers with a chance of Thunderstorms this afternoon. Some Thunderstorms may produce heavy rainfall. Locally heavy rainfall possible this afternoon. Near steady temperature in the mid 70s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain near 100 percent.

Tonight 18 Jun Jefferson

A slight chance of Thunderstorms. Showers, mainly in the evening. Some Thunderstorms may produce heavy rainfall. Lows in the lower 70s. Southwest Winds 5 to 10 Mph. Gusts up to 25 Mph in the evening. Chance of rain near 100 percent.

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Alton Temperature Statistics

June Temperature

Birmingham, Birmingham International Airport (6.2 miles)

  • Lowest 4 June, 2026

    59.6 °F

  • Average June

    79 °F

  • Highest 11 June, 2026

    93.7 °F

Climate (2021–2026)

Birmingham, Birmingham International Airport (6.2 miles)

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  • Average Low 2021–2026

    55.5 °F

  • Average 2021–2026

    65.5 °F

  • Average High 2021–2026

    76.1 °F
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