San Isidro, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for San Isidro, a community in Starr County, Texas.
This Afternoon
101°F
Sunny
Sunny, with a high near 101. Heat index values as high as 106. East wind 5 to 8 mph.
7-day forecast for San Isidro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 101°F | Sunny | 5 to 8 mph E | 4% |
| Tonight | 73°F | Mostly Clear | 0 to 12 mph ESE | 2% |
| Sunday | 102°F | Mostly Sunny | 0 to 7 mph E | 0% |
| Sunday Night | 75°F | Partly Cloudy | 0 to 10 mph E | 0% |
| Monday | 102°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph ENE | 17% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph NE | 17% |
| Tuesday | 100°F | Sunny then Chance Showers And Thunderstorms | 0 to 12 mph ENE | 33% |
| Tuesday Night | 74°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph ENE | 33% |
| Wednesday | 99°F | Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 12 mph ENE | 42% |
| Wednesday Night | 75°F | Chance Showers And Thunderstorms | 0 to 12 mph NE | 42% |
| Thursday | 98°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 12 mph NE | 49% |
| Thursday Night | 74°F | Chance Showers And Thunderstorms | 0 to 10 mph NE | 49% |
| Friday | 98°F | Chance Rain Showers | 1 to 10 mph ENE | 39% |
| Friday Night | 74°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph NE | 39% |
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 Sep 19, 2026.