McKinney Weather Forecast

    • 71
    • 95

    Chance Thunderstorms

    • 71
    • 91

    Chance Thunderstorms

    • 72
    • 93

    Slight Chance Thunderstorms

    • 72
    • 92

    Chance Thunderstorms

    • 69
    • 90

    Chance Thunderstorms

    • 66
    • 86

    Chance Rain Showers

Today 18 Sep Collin

Sunny. A slight chance of Showers and perhaps an isolated thunderstorm this afternoon. Highs in the mid 90s. Southwest Winds around 5 Mph. Chance of rain 20 percent.

Tonight 18 Sep Collin

Partly cloudy. A slight chance of Showers and Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the lower 70s. Southeast Winds around 5 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

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McKinney Temperature Statistics

September Temperature

McKinney - McKinney National Airport (3.1 miles)

  • Lowest 9 September, 2025

    57.9 °F

  • Average September

    77.6 °F

  • Highest 4 September, 2025

    100 °F

Climate (2020–Present)

McKinney - McKinney National Airport (3.1 miles)

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  • Average Low 2020–2025

    55.7 °F

  • Average 2020–2025

    66.4 °F

  • Average High 2020–2025

    77.3 °F
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