Denison, TX Weather & Growing Conditions
Today
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 99. South southeast wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 5 to 10 mph SSE | 2% |
| Tonight | 77°F | Mostly Clear | 5 to 10 mph SSE | 2% |
| Wednesday | 102°F | Sunny | 5 to 10 mph SSW | 0% |
| Wednesday Night | 79°F | Mostly Clear | 5 to 10 mph SSE | 0% |
| Thursday | 101°F | Sunny | 5 to 10 mph SSW | 3% |
| Thursday Night | 78°F | Mostly Clear | 5 to 10 mph SSE | 3% |
| Friday | 98°F | Mostly Sunny | 5 to 10 mph S | 11% |
| Friday Night | 77°F | Mostly Clear | 5 to 10 mph SSE | 11% |
| Saturday | 98°F | Sunny | 5 mph S | 8% |
| Saturday Night | 77°F | Mostly Clear | 5 mph SSE | 8% |
| Sunday | 98°F | Sunny | 5 to 10 mph S | 4% |
| Sunday Night | 77°F | Mostly Clear | 5 to 10 mph SSE | 4% |
| Monday | 98°F | Sunny | 5 to 10 mph S | 2% |
| Monday Night | 78°F | Mostly Clear | 10 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Denison, TX
Last spring frost
Mar 14
First fall frost
Nov 19
Growing season
250 days
Hardiness zone
8a
Explore more for Denison, TX: full frost dates · planting calendar · Texas frost dates
Climate data from the nearest NOAA station, Sherman, Tx (9.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.