Lake Bloomington Weather Forecast

    • 61
    • 92

    Mostly Sunny

    • 62
    • 87

    Chance Thunderstorms

    • 62
    • 84

    Chance Thunderstorms

    • 62
    • 81

    Rain Showers Likely

    • 61
    • 80

    Chance Thunderstorms

    • 59
    • 78

    Chance Rain Showers

    • 57
    • 77

    Slight Chance Thunderstorms

Today 18 Sep McLean

Sunny. Near steady temperature in the upper 80s. Southeast Winds around 5 Mph.

Tonight 18 Sep McLean

Mostly clear this Evening, then becoming partly cloudy. Lows in the lower 60s. East Winds around 5 Mph, becoming south after midnight.

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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 7 September, 2025

    45 °F

  • Average September

    67 °F

  • Highest 13 September, 2025

    93.9 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    43.5 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.1 °F
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