Rio Grande City, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rio Grande City, a city in Starr County, Texas.
Today
103°F
Sunny
Sunny, with a high near 103. Heat index values as high as 112. Southeast wind 7 to 12 mph, with gusts as high as 24 mph.
7-day forecast for Rio Grande City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 103°F | Sunny | 7 to 12 mph SE | 2% |
| Tonight | 80°F | Partly Cloudy | 8 to 13 mph SE | 3% |
| Wednesday | 103°F | Mostly Sunny | 8 to 12 mph SE | 1% |
| Wednesday Night | 79°F | Mostly Clear | 7 to 12 mph SE | 0% |
| Thursday | 103°F | Sunny | 6 to 10 mph SE | 5% |
| Thursday Night | 79°F | Mostly Clear | 6 to 12 mph SE | 5% |
| Friday | 102°F | Sunny | 5 to 9 mph SE | 3% |
| Friday Night | 78°F | Mostly Clear | 5 to 10 mph SE | 3% |
| Saturday | 101°F | Sunny | 3 to 8 mph ESE | 2% |
| Saturday Night | 78°F | Mostly Clear | 3 to 10 mph SE | 2% |
| Sunday | 102°F | Sunny | 2 to 9 mph SE | 4% |
| Sunday Night | 79°F | Mostly Clear | 7 to 10 mph SE | 4% |
| Monday | 103°F | Sunny | 6 to 12 mph SE | 2% |
| Monday Night | 80°F | Mostly Clear | 13 mph SE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Rio Grande City (26.381, -98.821). Updated through the day.
Growing snapshot for Rio Grande City
Last spring frost
Jan 31
First fall frost
Dec 17
Growing season
321 days
Hardiness zone
9b
More local growing data for Rio Grande City: nearby ZIP 78547 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, Rio Grande City, Tx (8.7 mi from Rio Grande City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.