Sullivan City, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sullivan City, a city in Hidalgo County, Texas.
This Afternoon
98°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms. Partly sunny, with a high near 98. Heat index values as high as 109. East wind around 9 mph. Chance of precipitation is 20%.
7-day forecast for Sullivan City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Slight Chance Showers And Thunderstorms | 9 mph E | 23% |
| Tonight | 78°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 1 to 10 mph ESE | 17% |
| Saturday | 100°F | Sunny | 1 to 6 mph E | 2% |
| Saturday Night | 78°F | Mostly Clear | 2 to 10 mph ESE | 3% |
| Sunday | 101°F | Sunny | 2 to 6 mph ESE | 4% |
| Sunday Night | 78°F | Partly Cloudy | 3 to 9 mph SE | 4% |
| Monday | 101°F | Sunny | 2 to 8 mph ESE | 12% |
| Monday Night | 78°F | Mostly Clear | 1 to 12 mph ESE | 12% |
| Tuesday | 100°F | Sunny then Chance Showers And Thunderstorms | 1 to 10 mph E | 36% |
| Tuesday Night | 78°F | Chance Showers And Thunderstorms then Mostly Clear | 0 to 12 mph ENE | 36% |
| Wednesday | 98°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 1 to 10 mph ENE | 42% |
| Wednesday Night | 78°F | Chance Showers And Thunderstorms | 0 to 10 mph ENE | 42% |
| Thursday | 98°F | Chance Showers And Thunderstorms | 1 to 9 mph ENE | 45% |
| Thursday Night | 78°F | Chance Showers And Thunderstorms | 0 to 9 mph ENE | 45% |
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 Sep 19, 2026.