San Juan, TX Weather & Growing Conditions
Overnight
78°F
Partly Cloudy
Partly cloudy, with a low around 78. East wind around 1 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 78°F | Partly Cloudy | 1 mph E | 2% |
| Saturday | 99°F | Mostly Sunny | 1 to 9 mph ENE | 10% |
| Saturday Night | 77°F | Mostly Clear | 2 to 13 mph ESE | 4% |
| Sunday | 99°F | Mostly Sunny | 2 to 9 mph E | 5% |
| Sunday Night | 78°F | Partly Cloudy | 3 to 13 mph ESE | 2% |
| Monday | 99°F | Sunny then Chance Showers And Thunderstorms | 2 to 12 mph ESE | 28% |
| Monday Night | 78°F | Chance Showers And Thunderstorms then Clear | 2 to 13 mph ESE | 28% |
| Tuesday | 97°F | Sunny then Chance Showers And Thunderstorms | 2 to 12 mph ENE | 42% |
| Tuesday Night | 78°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 13 mph NE | 42% |
| Wednesday | 96°F | Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 12 mph ENE | 46% |
| Wednesday Night | 78°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph ENE | 46% |
| Thursday | 96°F | Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 10 mph NE | 51% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms | 2 to 10 mph ENE | 51% |
| Friday | 95°F | Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 12 mph NE | 37% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for San Juan, TX
Last spring frost
Jan 9
First fall frost
Jan 3
Growing season
365 days
Hardiness zone
10a
Explore more for San Juan, TX: full frost dates · planting calendar · Texas frost dates
Climate data from the nearest NOAA station, Mcallen Miller Intl Ap, Tx (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.