Central Illinois Regional Airport at Bloomington-Normal Weather Forecast

    • 67
    • 91

    Chance Thunderstorms

    • 67
    • 81

    Slight Chance Thunderstorms

    • 68
    • 87

    Rain Showers Likely

    • 61
    • 79

    Rain Showers Likely

    • 56
    • 69

    Chance Thunderstorms

    • 53
    • 67

    Partly Sunny

    • 55
    • 70

    Partly Sunny

Today 17 Sep McLean

Sunny. Near steady temperature in the upper 80s. West Winds 5 to 10 Mph. Heat index Values up to 104.

Tonight 17 Sep McLean

Partly cloudy this Evening, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms. Lows in the upper 60s. Northeast Winds 5 to 10 Mph. Chance of rain 20 percent.

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Central Illinois Regional Airport at Bloomington-Normal Temperature Statistics

September Temperature

Bloomington/Normal, Central Illinois Regional Airport at Bloomington-Normal (0 miles)

  • Lowest 14 September, 2026

    52 °F

  • Average September

    75.4 °F

  • Highest 1 September, 2026

    95 °F

Climate (2021–2026)

Bloomington/Normal, Central Illinois Regional Airport at Bloomington-Normal (0 miles)

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  • Average Low 2021–2026

    43.8 °F

  • Average 2021–2026

    53.2 °F

  • Average High 2021–2026

    62.7 °F
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