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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

WhenTempForecastWindPrecip
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

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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.