San Juan, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Juan, a city in Hidalgo County, Texas.
Overnight
68°F
Partly Cloudy
Partly cloudy, with a low around 68. North wind around 9 mph.
7-day forecast for San Juan
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Partly Cloudy | 9 mph N | 7% |
| Wednesday | 85°F | Sunny | 6 to 9 mph NNE | 2% |
| Wednesday Night | 68°F | Mostly Clear | 3 to 8 mph E | 1% |
| Thursday | 91°F | Mostly Sunny | 3 to 8 mph SE | 6% |
| Thursday Night | 71°F | Showers And Thunderstorms | 2 to 8 mph E | 77% |
| Friday | 83°F | Chance Rain Showers | 7 to 13 mph N | 43% |
| Friday Night | 66°F | Mostly Cloudy | 3 to 8 mph NNE | 7% |
| Saturday | 80°F | Partly Sunny then Slight Chance Rain Showers | 9 mph NNE | 23% |
| Saturday Night | 63°F | Chance Rain Showers | 7 to 14 mph NNE | 35% |
| Sunday | 74°F | Chance Rain Showers | 10 to 14 mph N | 41% |
| Sunday Night | 58°F | Mostly Cloudy | 6 to 9 mph N | 13% |
| Monday | 75°F | Mostly Sunny | 2 to 8 mph NNE | 4% |
| Monday Night | 58°F | Partly Cloudy | 3 mph ENE | 3% |
| Tuesday | 80°F | Partly Sunny | 6 mph ENE | 5% |
Forecast source: National Weather Service (api.weather.gov) for San Juan (26.190, -98.152). Updated through the day.
Growing snapshot for San Juan
Last spring frost
Jan 9
First fall frost
Jan 3
Growing season
365 days
Hardiness zone
10a
More local growing data for San Juan: nearby ZIP 78589 weather · frost dates · planting calendar · Texas frost dates
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Hidalgo
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Climate data from the nearest NOAA station, Mcallen Miller Intl Ap, Tx (6.3 mi from San Juan). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.