Tri-County Airport Weather Forecast

    • 63
    • 79

    Chance Rain Showers

    • 68
    • 72

    Rain Showers Likely

    • 61
    • 76

    Rain Showers

    • 52
    • 66

    Chance Rain Showers

    • 53
    • 66

    Partly Sunny

    • 48
    • 67

    Mostly Sunny

Today 29 Sep Knox

Mostly sunny. Highs in the upper 70s. South Winds 5 to 10 Mph.

Tonight 29 Sep Knox

Mostly cloudy. A chance of Showers after midnight. Not as cool with Lows in the lower 60s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Tri-County Airport Temperature Statistics

September Temperature

Peoria - General Downing-Peoria International Airport (21.1 miles)

  • Lowest 27 September, 2026

    53.1 °F

  • Average September

    73.2 °F

  • Highest 3 September, 2026

    96.7 °F

Climate (2021–2026)

Peoria - General Downing-Peoria International Airport (21.1 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    54.9 °F

  • Average High 2021–2026

    64.7 °F
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