Clear Lake Weather Forecast

    • 25
    • 31

    Increasing Clouds

    • 23
    • 49

    Partly Sunny

    • 26
    • 37

    Partly Sunny

    • 37
    • 43

    Mostly Cloudy

    • 42
    • 55

    Mostly Cloudy

    • 53
    • 61

    Mostly Cloudy

Today 19 Dec Sangamon

Sunny. Much cooler with Highs in the lower 30s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 19 Dec Sangamon

Mostly clear in the Evening, then becoming mostly cloudy. Lows in the mid 20s. Temperature rising into the mid 30s after midnight. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

December Temperature

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

  • Lowest 14 December, 2025

    -6 °F

  • Average December

    24.2 °F

  • Highest 16 December, 2025

    44.1 °F

Climate (2020–Present)

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

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  • Average Low 2020–2025

    44.9 °F

  • Average 2020–2025

    55.1 °F

  • Average High 2020–2025

    65 °F
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