Thornton Lake Weather Forecast

    • 80
    • 102

    Hot

    • 76
    • 99

    Hot

    • 77
    • 96

    Hot

    • 80
    • 99

    Hot

    • 80
    • 99

    Hot

    • 80
    • 100

    Hot

Today 21 Jul Fannin

Sunny, hot with Highs around 102. North Winds around 5 Mph. Heat index Values up to 112.

Tonight 21 Jul Fannin

Clear with Lows around 80. East Winds around 5 Mph, becoming northwest after midnight.

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  • Temperature Real-Time

Thornton Lake Temperature Statistics

July Temperature

McKinney - McKinney National Airport (21.7 miles)

  • Lowest 5 July, 2026

    71.7 °F

  • Average July

    84.9 °F

  • Highest 9 July, 2026

    99.6 °F

Climate (2021–2026)

McKinney - McKinney National Airport (21.7 miles)

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  • Average Low 2021–2026

    56.5 °F

  • Average 2021–2026

    67.4 °F

  • Average High 2021–2026

    78.4 °F
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