Thornton Lake Weather Forecast

    • 77
    • 100

    Slight Chance Thunderstorms

    • 76
    • 99

    Hot

    • 75
    • 97

    Slight Chance Thunderstorms

    • 75
    • 97

    Hot

    • 75
    • 97

    Hot

    • 74
    • 97

    Hot

Today 8 Sep Fannin

Mostly sunny with a 20 percent chance of Showers and Thunderstorms. Hot with Highs around 102. South Winds 5 to 10 Mph. Heat index Values up to 106.

Tonight 8 Sep Fannin

Mostly clear. A slight chance of Showers and Thunderstorms in the evening. Lows in the upper 70s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Thornton Lake Temperature Statistics

September Temperature

McKinney - McKinney National Airport (21.7 miles)

  • Lowest 1 September, 2026

    75.7 °F

  • Average September

    87.1 °F

  • Highest 1 September, 2026

    100.7 °F

Climate (2021–2026)

McKinney - McKinney National Airport (21.7 miles)

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  • Average Low 2021–2026

    56.6 °F

  • Average 2021–2026

    67.5 °F

  • Average High 2021–2026

    78.5 °F
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