Alto Pass Weather Forecast

    • 64
    • 84

    Mostly Sunny

    • 63
    • 88

    Mostly Sunny

    • 60
    • 83

    Mostly Sunny

    • 55
    • 79

    Partly Sunny

    • 54
    • 75

    Partly Sunny

    • 55
    • 78

    Mostly Sunny

Today 22 Aug Union

Patchy fog in the morning. Sunny. Highs in the mid 80s. Northeast Winds around 5 Mph.

Tonight 22 Aug Union

Mostly clear. Lows in the mid 60s. Northeast Winds around 5 Mph in the Evening, becoming light and variable.

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Alto Pass Temperature Statistics

August Temperature

Southern Illinois Airport (14.9 miles)

  • Lowest 3 August, 2025

    55.7 °F

  • Average August

    79 °F

  • Highest 16 August, 2025

    96.7 °F

Climate (2020–Present)

Southern Illinois Airport (14.9 miles)

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  • Average Low 2020–2025

    47.9 °F

  • Average 2020–2025

    58.1 °F

  • Average High 2020–2025

    68.7 °F
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