Peoria Weather Forecast

    • 54
    • 62

    Slight Chance Rain Showers

    • 55
    • 67

    Chance Rain Showers

    • 52
    • 64

    Rain Showers Likely

    • 47
    • 67

    Partly Sunny

    • 44
    • 66

    Mostly Sunny

    • 47
    • 68

    Partly Sunny

    • 50
    • 69

    Partly Sunny

Today 21 Sep Union

Partly cloudy. Highs in the lower 70s.

Tonight 21 Sep Union

Cloudy. A chance of Showers this evening. Lows in the mid 50s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

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Peoria Temperature Statistics

September Temperature

Marysville Union County Airport (7.5 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    73.6 °F

  • Highest 1 September, 2026

    93.2 °F

Climate (2021–2026)

Marysville Union County Airport (7.5 miles)

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  • Average Low 2021–2026

    43.1 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    62.6 °F
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