San Fernando, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Fernando, a community in Starr County, Texas.
Today
102°F
Sunny
Sunny, with a high near 102. Heat index values as high as 111. Southeast wind around 12 mph, with gusts as high as 24 mph.
7-day forecast for San Fernando
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 102°F | Sunny | 12 mph SE | 2% |
| Tonight | 79°F | Partly Cloudy | 8 to 13 mph SE | 3% |
| Wednesday | 102°F | Mostly Sunny | 7 to 10 mph SE | 1% |
| Wednesday Night | 79°F | Mostly Clear | 7 to 12 mph SE | 0% |
| Thursday | 102°F | Sunny | 6 to 10 mph SE | 5% |
| Thursday Night | 78°F | Mostly Clear | 6 to 12 mph SE | 5% |
| Friday | 102°F | Sunny | 5 to 9 mph SE | 3% |
| Friday Night | 78°F | Mostly Clear | 3 to 10 mph SE | 3% |
| Saturday | 101°F | Sunny | 3 to 8 mph ESE | 2% |
| Saturday Night | 78°F | Mostly Clear | 3 to 10 mph SE | 2% |
| Sunday | 101°F | Sunny | 2 to 9 mph SE | 4% |
| Sunday Night | 79°F | Mostly Clear | 7 to 10 mph SE | 4% |
| Monday | 103°F | Sunny | 6 to 12 mph SE | 2% |
| Monday Night | 79°F | Mostly Clear | 13 mph SE | 2% |
Forecast source: National Weather Service (api.weather.gov) for San Fernando (26.403, -98.835). Updated through the day.
Growing snapshot for San Fernando
Last spring frost
Jan 31
First fall frost
Dec 17
Growing season
321 days
Hardiness zone
9b
More local growing data for San Fernando: nearby ZIP 78582 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Airport Heights
Alto Bonito Heights
Amada Acres
Anacua
B and E
Barrera
Benjamin Perez
Buena Vista
Camargito
Campo Verde
Casa Blanca
Casas
Chaparrito
Chapeno
Delmita
E. Lopez
East Alto Bonito
El Brazil
El Castillo
El Cenizo
El Chaparral
El Mesquite
El Quiote
El Rancho Vela
El Refugio
El Socio
Escobares
Eugenio Saenz
Evergreen
Falcon Heights
Climate data from the nearest NOAA station, Rio Grande City, Tx (11.5 mi from San Fernando). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.