Sullivan City, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sullivan City, a city in Hidalgo County, Texas.
Today
100°F
Sunny
Sunny, with a high near 100. Heat index values as high as 111. Southeast wind 8 to 15 mph, with gusts as high as 26 mph.
7-day forecast for Sullivan City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 100°F | Sunny | 8 to 15 mph SE | 1% |
| Tonight | 80°F | Partly Cloudy | 9 to 16 mph SE | 2% |
| Wednesday | 101°F | Mostly Sunny | 9 to 14 mph SE | 1% |
| Wednesday Night | 79°F | Mostly Clear | 7 to 14 mph SE | 0% |
| Thursday | 101°F | Sunny | 7 to 13 mph SE | 6% |
| Thursday Night | 79°F | Mostly Clear | 7 to 14 mph SE | 6% |
| Friday | 100°F | Sunny | 6 to 12 mph SE | 7% |
| Friday Night | 78°F | Mostly Clear | 5 to 13 mph SE | 7% |
| Saturday | 100°F | Sunny | 3 to 10 mph ESE | 5% |
| Saturday Night | 78°F | Mostly Clear | 5 to 13 mph SE | 5% |
| Sunday | 100°F | Sunny | 3 to 10 mph SE | 5% |
| Sunday Night | 79°F | Mostly Clear | 8 to 13 mph SE | 5% |
| Monday | 101°F | Sunny | 7 to 15 mph SE | 2% |
| Monday Night | 80°F | Mostly Clear | 13 to 16 mph SE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Sullivan City (26.275, -98.564). Updated through the day.
Growing snapshot for Sullivan City
Last spring frost
Jan 23
First fall frost
Dec 28
Growing season
340 days
Hardiness zone
10a
More local growing data for Sullivan City: nearby ZIP 78565 weather · frost dates · planting calendar · Texas frost dates
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Climate data from the nearest NOAA station, La Joya, Tx (15.7 mi from Sullivan City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.