Sun Valley, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sun Valley, a city in Lamar County, Texas.
Today
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 99. South southwest wind 5 to 10 mph.
7-day forecast for Sun Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 5 to 10 mph SSW | 0% |
| Tonight | 72°F | Mostly Clear | 5 to 10 mph S | 0% |
| Sunday | 98°F | Mostly Sunny | 5 to 10 mph SSW | 2% |
| Sunday Night | 73°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 mph SSW | 35% |
| Monday | 95°F | Chance Showers And Thunderstorms | 5 mph W | 35% |
| Monday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph NNE | 21% |
| Tuesday | 92°F | Mostly Sunny | 5 to 10 mph NNE | 11% |
| Tuesday Night | 66°F | Partly Cloudy | 5 to 10 mph NNE | 10% |
| Wednesday | 90°F | Mostly Sunny | 5 to 10 mph ENE | 9% |
| Wednesday Night | 65°F | Mostly Clear | 5 mph ENE | 2% |
| Thursday | 90°F | Mostly Sunny | 5 mph E | 1% |
| Thursday Night | 65°F | Partly Cloudy | 5 mph E | 1% |
| Friday | 90°F | Mostly Sunny | 5 mph ENE | 2% |
| Friday Night | 66°F | Partly Cloudy | 5 mph E | 1% |
Forecast source: National Weather Service (api.weather.gov) for Sun Valley (33.671, -95.429). Updated through the day.
Growing snapshot for Sun Valley
Last spring frost
Mar 14
First fall frost
Nov 16
Growing season
247 days
Hardiness zone
8b
More local growing data for Sun Valley: nearby ZIP 75462 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Paris, Tx (5.2 mi from Sun Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.