Sebastian, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sebastian, a community in Willacy County, Texas.
This Afternoon
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 107. East wind 3 to 13 mph.
7-day forecast for Sebastian
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Sunny | 3 to 13 mph E | 10% |
| Tonight | 75°F | Mostly Clear | 0 to 13 mph SE | 0% |
| Sunday | 99°F | Mostly Sunny | 0 to 12 mph ENE | 8% |
| Sunday Night | 76°F | Partly Cloudy | 1 to 13 mph ESE | 2% |
| Monday | 98°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 13 mph ESE | 30% |
| Monday Night | 76°F | Chance Showers And Thunderstorms then Clear | 0 to 13 mph E | 30% |
| Tuesday | 97°F | Sunny then Chance Showers And Thunderstorms | 1 to 13 mph ENE | 34% |
| Tuesday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 13 mph NE | 34% |
| Wednesday | 97°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 14 mph NE | 41% |
| Wednesday Night | 77°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 13 mph ENE | 41% |
| Thursday | 96°F | Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 13 mph NE | 44% |
| Thursday Night | 76°F | Chance Showers And Thunderstorms | 2 to 13 mph ENE | 44% |
| Friday | 96°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 13 mph NE | 30% |
| Friday Night | 75°F | Chance Showers And Thunderstorms then Mostly Clear | 2 to 12 mph ENE | 30% |
Forecast source: National Weather Service (api.weather.gov) for Sebastian (26.345, -97.796). Updated through the day.
Growing snapshot for Sebastian
Last spring frost
Jan 10
First fall frost
Dec 27
Growing season
355 days
Hardiness zone
10a
More local growing data for Sebastian: nearby ZIP 78594 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Lasara
Los Angeles
Lyford
Port Mansfield
Ranchette Estates
Raymondville
San Perlita
Yznaga
Zapata Ranch
Climate data from the nearest NOAA station, Santa Rosa 3 Wnw, Tx (6.9 mi from Sebastian). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.