Lake Bloomington Weather Forecast

    • 56
    • 66

    Rain Showers

    • 54
    • 67

    Mostly Cloudy

    • 54
    • 70

    Mostly Cloudy

    • 50
    • 70

    Mostly Cloudy

    • 53
    • 67

    Mostly Cloudy

    • 53
    • 70

    Partly Sunny

    • 57
    • 74

    Partly Sunny

Today 22 Sep McLean

Partly sunny. A chance of Showers in the afternoon. Highs in the upper 70s. Chance of rain 30 percent.

Tonight 22 Sep McLean

Mostly cloudy. Isolated Showers this Evening, then scattered Sprinkles after midnight. Lows in the mid 50s. Northeast Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Bloomington Temperature Statistics

September Temperature

Bloomington/Normal, Central Illinois Regional Airport at Bloomington-Normal (11.2 miles)

  • Lowest 14 September, 2026

    52 °F

  • Average September

    75 °F

  • Highest 1 September, 2026

    95 °F

Climate (2021–2026)

Bloomington/Normal, Central Illinois Regional Airport at Bloomington-Normal (11.2 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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