San Juan, TX Weather & Growing Conditions
Today
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 108. Southeast wind 12 to 17 mph, with gusts as high as 28 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 12 to 17 mph SE | 1% |
| Tonight | 80°F | Mostly Clear | 9 to 17 mph SE | 2% |
| Wednesday | 100°F | Mostly Sunny | 9 to 15 mph SE | 2% |
| Wednesday Night | 80°F | Mostly Clear | 7 to 15 mph SE | 0% |
| Thursday | 100°F | Sunny | 7 to 15 mph SE | 6% |
| Thursday Night | 79°F | Mostly Clear | 7 to 16 mph SE | 6% |
| Friday | 99°F | Sunny then Slight Chance Showers And Thunderstorms | 6 to 14 mph SE | 16% |
| Friday Night | 78°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 to 14 mph SE | 16% |
| Saturday | 99°F | Sunny | 3 to 13 mph ESE | 8% |
| Saturday Night | 78°F | Mostly Clear | 3 to 14 mph SE | 8% |
| Sunday | 99°F | Sunny | 3 to 13 mph SE | 8% |
| Sunday Night | 79°F | Mostly Clear | 8 to 14 mph SE | 8% |
| Monday | 99°F | Sunny | 7 to 17 mph SE | 2% |
| Monday Night | 80°F | Mostly Clear | 10 to 17 mph SE | 2% |
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 Aug 4, 2026.