McKinney, TX Weather & Growing Conditions
Today
99°F
Mostly Sunny
Mostly sunny, with a high near 99. Heat index values as high as 102. South wind 10 to 15 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Mostly Sunny | 10 to 15 mph S | 0% |
| Tonight | 76°F | Mostly Clear | 10 to 15 mph SSE | 0% |
| Sunday | 99°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 10 mph S | 17% |
| Sunday Night | 74°F | Chance Showers And Thunderstorms | 5 to 10 mph SSE | 46% |
| Monday | 96°F | Chance Showers And Thunderstorms | 5 mph WSW | 46% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph NNE | 17% |
| Tuesday | 92°F | Mostly Sunny | 10 mph NNE | 12% |
| Tuesday Night | 68°F | Partly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 92°F | Mostly Sunny | 10 mph ENE | 9% |
| Wednesday Night | 69°F | Partly Cloudy | 5 to 10 mph ENE | 2% |
| Thursday | 92°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Thursday Night | 69°F | Partly Cloudy | 5 to 10 mph E | 1% |
| Friday | 92°F | Mostly Sunny | 5 to 10 mph E | 3% |
| Friday Night | 69°F | Partly Cloudy | 5 to 10 mph E | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for McKinney, TX
Last spring frost
Mar 18
First fall frost
Nov 11
Growing season
239 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 Muni Ap, Tx (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.