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
71°F
Mostly Sunny
Mostly sunny. High near 71, with temperatures falling to around 68 in the afternoon. Northwest wind 0 to 5 mph.
7-day forecast for Sun Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 71°F | Mostly Sunny | 0 to 5 mph NW | 0% |
| Tonight | 47°F | Partly Cloudy then Patchy Fog | 0 mph | 0% |
| Thursday | 73°F | Patchy Fog then Sunny | 0 to 5 mph SSE | 0% |
| Thursday Night | 52°F | Partly Cloudy | 0 to 10 mph NE | 7% |
| Friday | 69°F | Sunny | 10 mph N | 0% |
| Friday Night | 44°F | Partly Cloudy | 5 to 10 mph NNE | 0% |
| Saturday | 66°F | Mostly Sunny | 5 mph NE | 1% |
| Saturday Night | 42°F | Slight Chance Rain Showers | 5 mph N | 15% |
| Sunday | 67°F | Mostly Sunny | 5 mph N | 3% |
| Sunday Night | 41°F | Mostly Clear | 0 mph | 0% |
| Monday | 69°F | Sunny | 0 to 5 mph SW | 3% |
| Monday Night | 42°F | Clear | 0 mph | 1% |
| Tuesday | 72°F | Sunny | 0 to 5 mph S | 1% |
| Tuesday Night | 46°F | Partly Cloudy | 0 to 5 mph SSE | 2% |
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 Nov 4, 2026.