Alton Weather Forecast

    • 57
    • 78

    Partly Sunny

    • 56
    • 81

    Rain

    • 37
    • 68

    Partly Sunny

    • 36
    • 51

    Mostly Sunny

    • 53
    • 70

    Mostly Sunny

    • 55
    • 76

    Mostly Cloudy

Today 13 Mar Madison

Mostly sunny. Highs in the upper 70s. East Winds 5 to 10 Mph.

Tonight 13 Mar Madison

Mostly clear. Not as cool with Lows around 50. East Winds around 5 Mph.

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Alton Temperature Statistics

March Temperature

St. Louis Regional Airport (8.1 miles)

  • Lowest 2 March, 2025

    19 °F

  • Average March

    40.7 °F

  • Highest 10 March, 2025

    71.6 °F

Climate (2020–Present)

St. Louis Regional Airport (8.1 miles)

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    65.7 °F
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