Alton Weather Forecast

    • 69
    • 90

    Chance Thunderstorms

    • 67
    • 86

    Mostly Sunny

    • 69
    • 89

    Mostly Sunny

    • 73
    • 92

    Mostly Sunny

    • 75
    • 94

    Partly Sunny

    • 76
    • 95

    Partly Sunny

Today 30 Jun Madison

Partly sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the upper 80s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 30 Jun Madison

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Lows in the upper 60s. Northwest Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Alton Temperature Statistics

June Temperature

St. Louis Regional Airport (8.1 miles)

  • Lowest 2 June, 2025

    55.6 °F

  • Average June

    73 °F

  • Highest 25 June, 2025

    95 °F

Climate (2020–Present)

St. Louis Regional Airport (8.1 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    53.8 °F

  • Average High 2020–2025

    65.9 °F
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