Southern Illinois Airport Weather Forecast

    • 69
    • 96

    Chance Thunderstorms

    • 62
    • 83

    Partly Sunny

    • 61
    • 81

    Partly Sunny

    • 64
    • 81

    Slight Chance Thunderstorms

    • 68
    • 87

    Mostly Sunny

    • 73
    • 93

    Mostly Sunny

Today 21 Jul Jackson

Mostly sunny. A chance of Showers in the Morning, then a slight chance of Showers and Thunderstorms in the afternoon. Hot with Highs in the mid 90s. Southwest Winds 5 to 10 Mph, becoming northwest in the afternoon. Chance of rain 40 percent. Highest heat index Readings heat index Readings up to 106 in the afternoon.

Tonight 21 Jul Jackson

Mostly clear. Lows in the upper 60s. North Winds 5 to 10 Mph.

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Southern Illinois Airport Temperature Statistics

July Temperature

Southern Illinois Airport (0 miles)

  • Lowest 14 July, 2026

    68 °F

  • Average July

    80.7 °F

  • Highest 2 July, 2026

    95.6 °F

Climate (2021–2026)

Southern Illinois Airport (0 miles)

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  • Average Low 2021–2026

    48.2 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    69.4 °F
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