Clear Lake Weather Forecast

    • 64
    • 94

    Increasing Clouds

    • 63
    • 86

    Chance Thunderstorms

    • 63
    • 86

    Chance Thunderstorms

    • 64
    • 83

    Rain Showers Likely

    • 64
    • 83

    Chance Thunderstorms

    • 61
    • 79

    Chance Rain Showers

    • 59
    • 77

    Chance Rain Showers

Today 18 Sep Sangamon

Sunny. Near steady temperature in the lower 90s. Southeast Winds around 5 Mph.

Tonight 18 Sep Sangamon

Partly cloudy late this Evening, then mostly cloudy with a slight chance of Showers and Thunderstorms. Lows in the mid 60s. Southeast Winds around 5 Mph, becoming northwest. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

September Temperature

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

  • Lowest 7 September, 2025

    39.9 °F

  • Average September

    67.5 °F

  • Highest 13 September, 2025

    97 °F

Climate (2020–Present)

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

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  • Average Low 2020–2025

    44.8 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    65 °F
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