Clear Lake Weather Forecast

    • 72
    • 92

    Chance Rain Showers

    • 67
    • 94

    Rain Showers

    • 59
    • 83

    Chance Rain Showers

    • 65
    • 86

    Chance Rain Showers

    • 65
    • 89

    Slight Chance Rain Showers

    • 64
    • 88

    Slight Chance Thunderstorms

Today 8 Sep Sangamon

Mostly sunny. Highs in the lower 90s. South Winds 5 to 10 Mph.

Tonight 8 Sep Sangamon

Mostly clear. Not as cool with Lows in the lower 70s. South 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 5 September, 2026

    73.9 °F

  • Average September

    87.1 °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 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.7 °F
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