Clear Lake Weather Forecast

    • 75
    • 92

    Decreasing Clouds

    • 75
    • 95

    Mostly Sunny

    • 77
    • 95

    Sunny

    • 76
    • 94

    Chance Thunderstorms

    • 75
    • 92

    Chance Thunderstorms

    • 73
    • 92

    Chance Thunderstorms

Today 29 Jun Sangamon

Mostly sunny. Humid with Highs in the lower 90s. South Winds 10 to 15 Mph with Gusts up to 25 Mph. Heat index Values up to 107 in the afternoon.

Tonight 29 Jun Sangamon

Partly cloudy. Near steady temperature in the mid 70s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

June Temperature

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

  • Lowest 3 June, 2026

    50.6 °F

  • Average June

    72 °F

  • Highest 10 June, 2026

    90.6 °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

    55.4 °F

  • Average High 2021–2026

    65.6 °F
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