Clear Lake Weather Forecast

    • 55
    • 69

    Mostly Cloudy

    • 56
    • 70

    Mostly Cloudy

    • 55
    • 74

    Mostly Cloudy

    • 52
    • 74

    Mostly Cloudy

    • 55
    • 73

    Mostly Cloudy

    • 56
    • 77

    Partly Sunny

Today 22 Sep Sangamon

Mostly cloudy with a chance of Sprinkles in the Morning, then partly sunny in the afternoon. Highs around 70. Northeast Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 22 Sep Sangamon

Mostly cloudy. Lows in the mid 50s. Northeast Winds 5 to 10 Mph.

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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 14 September, 2026

    56.6 °F

  • Average September

    79.8 °F

  • Highest 2 September, 2026

    100.7 °F

Climate (2021–2026)

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

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  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.7 °F
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