McKinney Weather Forecast

    • 81
    • 104

    Hot

    • 84
    • 105

    Hot

    • 84
    • 106

    Hot

    • 83
    • 107

    Hot

    • 80
    • 104

    Hot

    • 79
    • 103

    Hot

Today 22 Aug Collin

Mostly sunny. A 20 percent chance of Showers and Thunderstorms in the afternoon. Hot with Highs around 105. South Winds 5 to 10 Mph. Heat index Values up to 108 in the afternoon.

Tonight 22 Aug Collin

Mostly clear. Lows around 80. South Winds around 5 Mph.

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McKinney Temperature Statistics

August Temperature

McKinney - McKinney National Airport (3.1 miles)

  • Lowest 2 August, 2026

    67.6 °F

  • Average August

    88.3 °F

  • Highest 18 August, 2026

    104.6 °F

Climate (2021–2026)

McKinney - McKinney National Airport (3.1 miles)

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  • Average Low 2021–2026

    56.5 °F

  • Average 2021–2026

    67.4 °F

  • Average High 2021–2026

    78.5 °F
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