San Juan, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Juan, a community in Starr County, Texas.
Today
85°F
Sunny
Sunny, with a high near 85. Northeast wind around 3 mph.
7-day forecast for San Juan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 3 mph NE | 0% |
| Tonight | 65°F | Mostly Clear | 0 to 3 mph E | 2% |
| Thursday | 89°F | Mostly Sunny | 1 to 5 mph SSE | 7% |
| Thursday Night | 69°F | Mostly Cloudy then Showers And Thunderstorms Likely | 1 to 6 mph N | 66% |
| Friday | 82°F | Chance Rain Showers then Partly Sunny | 5 to 9 mph NNW | 26% |
| Friday Night | 64°F | Mostly Cloudy | 0 to 3 mph N | 3% |
| Saturday | 78°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph N | 19% |
| Saturday Night | 60°F | Chance Rain Showers | 3 to 9 mph N | 41% |
| Sunday | 73°F | Chance Rain Showers | 6 to 9 mph N | 35% |
| Sunday Night | 56°F | Slight Chance Rain Showers then Mostly Cloudy | 0 to 3 mph N | 16% |
| Monday | 76°F | Mostly Sunny | 1 to 5 mph N | 6% |
| Monday Night | 56°F | Partly Cloudy | 0 mph | 4% |
| Tuesday | 80°F | Partly Sunny | 0 to 3 mph ESE | 3% |
| Tuesday Night | 60°F | Mostly Cloudy | 1 mph E | 1% |
Forecast source: National Weather Service (api.weather.gov) for San Juan (26.415, -98.944). Updated through the day.
Growing snapshot for San Juan
Last spring frost
Jan 9
First fall frost
Jan 1
Growing season
363 days
Hardiness zone
9b
More local growing data for San Juan: nearby ZIP 78585 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, Falcon Dam, Tx (6.2 mi from San Juan). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.