Clear Lake Weather Forecast

    • 63
    • 83

    Increasing Clouds

    • 70
    • 84

    Chance Rain Showers

    • 60
    • 84

    Rain Showers Likely

    • 55
    • 69

    Chance Rain Showers

    • 55
    • 70

    Chance Rain Showers

    • 51
    • 69

    Partly Sunny

Today 29 Sep Sangamon

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

Tonight 29 Sep Sangamon

Partly cloudy in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Not as cool with Lows in the lower 60s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • 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

    76.3 °F

  • Highest 2 September, 2026

    100.7 °F

Climate (2021–2026)

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    45.1 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.7 °F
Get WillyWeather+ to remove ads