Alto Pass Weather Forecast

    • 26
    • 33

    Slight Chance Snow Showers

    • 24
    • 45

    Mostly Cloudy

    • 12
    • 30

    Partly Sunny

    • 17
    • 26

    Mostly Sunny

    • 10
    • 25

    Partly Sunny

    • 23
    • 32

    Mostly Sunny

    • 24
    • 43

    Partly Sunny

Today 15 Jan Union

Sunny. Highs in the mid 30s. West Winds around 5 Mph.

Tonight 15 Jan Union

Mostly cloudy. A slight chance of snow Showers in the evening. Lows in the mid 20s. South Winds 5 to 10 Mph. Chance of snow 20 percent.

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  • Temperature Real-Time

Alto Pass Temperature Statistics

January Temperature

Southern Illinois Airport (14.9 miles)

  • Lowest 4 January, 2026

    21 °F

  • Average January

    42.6 °F

  • Highest 8 January, 2026

    68 °F

Climate (2021–Present)

Southern Illinois Airport (14.9 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    58.3 °F

  • Average High 2021–2026

    68.9 °F
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