Hartline Air Strip STOLport Weather Forecast

    • 62
    • 81

    Chance Rain Showers

    • 54
    • 73

    Rain Showers

    • 55
    • 77

    Partly Sunny

    • 62
    • 76

    Chance Thunderstorms

    • 54
    • 79

    Rain Showers

    • 51
    • 74

    Mostly Sunny

Today 23 Apr Union

Mostly sunny. Highs in the lower 80s. South Winds 5 to 10 Mph, increasing to around 15 Mph with Gusts up to 25 Mph this afternoon.

Tonight 23 Apr Union

Partly cloudy. A slight chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

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Hartline Air Strip STOLport Temperature Statistics

April Temperature

Southern Illinois Airport (21.7 miles)

  • Lowest 6 April, 2026

    36.6 °F

  • Average April

    65.7 °F

  • Highest 14 April, 2026

    86.6 °F

Climate (2021–Present)

Southern Illinois Airport (21.7 miles)

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  • Average Low 2021–2026

    48.1 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    69.2 °F
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