Clear Lake Weather Forecast

    • 69
    • 94

    Rain Showers Likely

    • 72
    • 91

    Chance Rain Showers

    • 70
    • 94

    Partly Sunny

    • 70
    • 92

    Mostly Sunny

    • 69
    • 92

    Slight Chance Rain Showers

    • 64
    • 86

    Chance Rain Showers

Today 15 Sep Sangamon

Mostly sunny. A chance of Showers and Thunderstorms in the afternoon. More humid with Highs in the mid 90s. South Winds 10 to 15 Mph, becoming west 5 to 10 Mph in the afternoon. Chance of rain 40 percent.

Tonight 15 Sep Sangamon

A chance of Thunderstorms. Showers likely. Humid with Lows in the upper 60s. Northwest Winds around 5 Mph, becoming northeast after midnight. Chance of rain 70 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, 2026

    58.6 °F

  • Average September

    80.4 °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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