Clear Lake Weather Forecast

    • 57
    • 81

    Mostly Sunny

    • 63
    • 83

    Rain Showers Likely

    • 63
    • 81

    Rain Showers Likely

    • 63
    • 85

    Chance Thunderstorms

    • 60
    • 79

    Chance Rain Showers

    • 58
    • 77

    Slight Chance Thunderstorms

Today 25 May Sangamon

Sunny. Highs in the lower 80s. Southeast Winds 5 to 10 Mph.

Tonight 25 May Sangamon

Partly cloudy. Lows in the mid 50s. Southeast Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

May Temperature

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    62 °F

  • Highest 17 May, 2026

    85.6 °F

Climate (2021–Present)

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

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  • Average Low 2021–2026

    45 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    65.6 °F
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