Glenn Weather Forecast

    • 46
    • 54

    Rain

    • 35
    • 57

    Mostly Cloudy

    • 41
    • 52

    Mostly Cloudy

    • 44
    • 63

    Partly Sunny

    • 36
    • 60

    Partly Sunny

    • 39
    • 51

    Partly Sunny

Today 30 Jan Jackson

Rain likely in the Morning, then rain with a slight chance of Thunderstorms in the afternoon. Highs in the mid 50s. Southeast Winds 5 to 10 Mph. Chance of rain near 100 percent.

Tonight 30 Jan Jackson

Rain, mainly in the evening. Lows in the upper 40s. Southeast Winds around 10 Mph, becoming southwest after midnight. Chance of rain near 100 percent.

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Glenn Temperature Statistics

January Temperature

Southern Illinois Airport (18 miles)

  • Lowest 15 January, 2025

    6.9 °F

  • Average January

    27.4 °F

  • Highest 17 January, 2025

    52.6 °F

Climate (2020–Present)

Southern Illinois Airport (18 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    57.7 °F

  • Average High 2020–2025

    68.3 °F
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