Clarion Weather Forecast

    • 64
    • 88

    Partly Sunny

    • 60
    • 81

    Mostly Sunny

    • 62
    • 81

    Mostly Sunny

    • 71
    • 88

    Partly Sunny

    • 64
    • 88

    Partly Sunny

    • 59
    • 80

    Partly Sunny

    • 61
    • 81

    Slight Chance Rain Showers

Today 5 Sep Bureau

Sunny, hot with Highs around 90. North Winds 5 to 10 Mph.

Tonight 5 Sep Bureau

Partly cloudy. Cooler with Lows in the mid 60s. Northeast Winds 5 to 10 Mph.

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Clarion Temperature Statistics

September Temperature

Illinois Valley Regional Airport (10.6 miles)

  • Lowest 1 September, 2026

    71.6 °F

  • Average September

    82.7 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Illinois Valley Regional Airport (10.6 miles)

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  • Average Low 2021–2026

    43.3 °F

  • Average 2021–2026

    52.9 °F

  • Average High 2021–2026

    62.6 °F
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