McKinney Weather Forecast
- 79
- 100
Hot
- 79
- 101
Hot
- 79
- 101
Hot
- 78
- 102
Hot
- 78
- 100
Hot
- 78
- 100
Hot
Today 5 Sep Collin
Sunny, hot with Highs in the upper 90s. South Winds around 5 Mph, becoming southeast this afternoon. Heat index Values up to 106.
Tonight 5 Sep Collin
Clear. Lows in the upper 70s. South Winds 5 to 10 Mph.
McKinney Temperature Statistics
September Temperature
McKinney - McKinney National Airport (3.1 miles)
Lowest 1 September, 2026
75.7 °FAverage September
87.7 °FHighest 1 September, 2026
100.7 °F
Climate (2021–2026)
McKinney - McKinney National Airport (3.1 miles)
Average Low 2021–2026
56.6 °FAverage 2021–2026
67.5 °FAverage High 2021–2026
78.5 °F