McKinney, TX Weather & Growing Conditions
Today
100°F
Sunny
Sunny, with a high near 100. Heat index values as high as 101. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Sunny | 5 to 10 mph S | 2% |
| Tonight | 79°F | Mostly Clear | 5 to 10 mph SSE | 1% |
| Wednesday | 101°F | Sunny | 5 to 10 mph SSW | 2% |
| Wednesday Night | 80°F | Mostly Clear | 10 mph S | 0% |
| Thursday | 100°F | Sunny | 10 mph SSW | 1% |
| Thursday Night | 79°F | Mostly Clear | 10 mph SSE | 1% |
| Friday | 99°F | Sunny | 5 to 10 mph S | 9% |
| Friday Night | 78°F | Mostly Clear | 5 to 10 mph SSE | 9% |
| Saturday | 97°F | Sunny | 5 to 10 mph S | 8% |
| Saturday Night | 78°F | Mostly Clear | 10 mph SSE | 8% |
| Sunday | 98°F | Sunny | 5 to 10 mph S | 4% |
| Sunday Night | 78°F | Mostly Clear | 10 mph SSE | 4% |
| Monday | 98°F | Sunny | 10 to 15 mph S | 4% |
| Monday Night | 79°F | Mostly Clear | 10 to 15 mph S | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for McKinney, TX
Last spring frost
Mar 17
First fall frost
Nov 15
Growing season
241 days
Hardiness zone
8b
Explore more for McKinney, TX: full frost dates · planting calendar · Texas frost dates
Climate data from the nearest NOAA station, Mckinney Municipal Airport, Tx (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.