Southern Illinois Airport Weather Forecast

    • 50
    • 69

    Sunny

    • 54
    • 78

    Mostly Sunny

    • 56
    • 78

    Mostly Sunny

    • 63
    • 81

    Rain Showers Likely

    • 55
    • 77

    Rain Showers

    • 53
    • 75

    Chance Rain Showers

Today 20 Apr Jackson

Sunny. Highs in the upper 60s. Northeast Winds around 5 Mph, becoming southeast this afternoon.

Tonight 20 Apr Jackson

Clear. Lows around 50. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Southern Illinois Airport Temperature Statistics

April Temperature

Southern Illinois Airport (0 miles)

  • Lowest 6 April, 2026

    36.6 °F

  • Average April

    66 °F

  • Highest 14 April, 2026

    86.6 °F

Climate (2021–Present)

Southern Illinois Airport (0 miles)

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  • Average Low 2021–2026

    48.1 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.2 °F
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