Lewisville, TX Weather & Growing Conditions
Today
100°F
Mostly Sunny
Mostly sunny, with a high near 100. Heat index values as high as 103. South wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Tonight | 79°F | Mostly Clear | 10 mph SSE | 0% |
| Sunday | 100°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 22% |
| Sunday Night | 77°F | Chance Showers And Thunderstorms | 5 mph S | 42% |
| Monday | 96°F | Chance Showers And Thunderstorms | 5 mph W | 42% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 10 mph NE | 18% |
| Tuesday | 92°F | Mostly Sunny | 10 mph NNE | 11% |
| Tuesday Night | 71°F | Partly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 92°F | Mostly Sunny | 5 to 10 mph ENE | 7% |
| Wednesday Night | 73°F | Partly Cloudy | 5 to 10 mph E | 2% |
| Thursday | 93°F | Mostly Sunny | 5 to 10 mph E | 4% |
| Thursday Night | 73°F | Partly Cloudy | 5 to 10 mph E | 2% |
| Friday | 93°F | Mostly Sunny | 5 to 10 mph ESE | 3% |
| Friday Night | 74°F | Mostly Cloudy | 5 to 10 mph E | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lewisville, TX
Last spring frost
Mar 14
First fall frost
Nov 17
Growing season
249 days
Hardiness zone
8b
Explore more for Lewisville, TX: full frost dates · planting calendar · Texas frost dates
Climate data from the nearest NOAA station, Grapevine Dam, Tx (5.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.