San Isidro, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Isidro, a community in Starr County, Texas.
Today
102°F
Sunny
Sunny, with a high near 102. Heat index values as high as 107. Southeast wind 7 to 15 mph, with gusts as high as 24 mph.
7-day forecast for San Isidro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 102°F | Sunny | 7 to 15 mph SE | 2% |
| Tonight | 78°F | Mostly Clear | 8 to 15 mph SE | 2% |
| Wednesday | 102°F | Mostly Sunny | 8 to 14 mph SE | 2% |
| Wednesday Night | 78°F | Mostly Clear | 6 to 14 mph SE | 0% |
| Thursday | 102°F | Sunny | 6 to 12 mph SE | 7% |
| Thursday Night | 77°F | Mostly Clear | 5 to 13 mph SE | 7% |
| Friday | 101°F | Sunny | 3 to 13 mph SE | 11% |
| Friday Night | 76°F | Mostly Clear | 1 to 13 mph SE | 11% |
| Saturday | 100°F | Sunny | 1 to 10 mph ESE | 4% |
| Saturday Night | 76°F | Mostly Clear | 2 to 12 mph SE | 4% |
| Sunday | 100°F | Sunny | 1 to 10 mph SE | 5% |
| Sunday Night | 77°F | Mostly Clear | 5 to 13 mph SE | 5% |
| Monday | 102°F | Sunny | 5 to 15 mph SE | 2% |
| Monday Night | 78°F | Mostly Clear | 9 to 15 mph SE | 2% |
Forecast source: National Weather Service (api.weather.gov) for San Isidro (26.714, -98.448). Updated through the day.
Growing snapshot for San Isidro
Last spring frost
Jan 22
First fall frost
Dec 19
Growing season
333 days
Hardiness zone
9b
More local growing data for San Isidro: nearby ZIP 78588 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, Mccook, Tx (20.8 mi from San Isidro). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.