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
102°F
Sunny
Sunny, with a high near 102. Heat index values as high as 109. East southeast wind around 5 mph.
7-day forecast for Rio Grande City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 102°F | Sunny | 5 mph ESE | 0% |
| Tonight | 78°F | Mostly Clear | 2 to 8 mph ESE | 0% |
| Sunday | 102°F | Mostly Sunny | 5 mph ESE | 0% |
| Sunday Night | 78°F | Partly Cloudy | 2 to 7 mph ESE | 0% |
| Monday | 102°F | Sunny | 1 to 6 mph ESE | 12% |
| Monday Night | 78°F | Mostly Clear | 1 to 9 mph ESE | 12% |
| Tuesday | 100°F | Sunny then Chance Showers And Thunderstorms | 1 to 8 mph E | 29% |
| Tuesday Night | 78°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 8 mph E | 29% |
| Wednesday | 99°F | Chance Showers And Thunderstorms | 0 to 7 mph ENE | 44% |
| Wednesday Night | 78°F | Chance Showers And Thunderstorms | 0 to 7 mph NE | 44% |
| Thursday | 98°F | Chance Rain Showers | 1 to 6 mph ENE | 48% |
| Thursday Night | 77°F | Chance Showers And Thunderstorms | 0 to 6 mph ENE | 48% |
| Friday | 99°F | Chance Rain Showers | 1 to 7 mph ENE | 31% |
| Friday Night | 76°F | Chance Showers And Thunderstorms | 0 to 7 mph ENE | 31% |
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
Nearby towns & communities
Airport Heights
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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 Sep 19, 2026.