Blairsville Weather Forecast

    • 63
    • 81

    Chance Rain Showers

    • 53
    • 73

    Rain Showers

    • 54
    • 77

    Mostly Sunny

    • 62
    • 77

    Rain Showers Likely

    • 55
    • 79

    Rain Showers

    • 50
    • 73

    Mostly Sunny

    • 54
    • 72

    Chance Rain Showers

Today 23 Apr Williamson

Mostly sunny. Near steady temperature in the lower 80s. South Winds around 15 Mph with Gusts up to 25 Mph.

Tonight 23 Apr Williamson

Mostly clear this Evening, then partly cloudy with a slight chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. South Winds 10 to 15 Mph. Chance of rain 20 percent.

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Blairsville Temperature Statistics

April Temperature

Southern Illinois Airport (6.8 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 (6.8 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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