Castroville, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Castroville, a city in Medina County, Texas.
Today
98°F
Mostly Sunny
Mostly sunny, with a high near 98. Heat index values as high as 104. Southeast wind 5 to 10 mph.
7-day forecast for Castroville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Mostly Sunny | 5 to 10 mph SE | 7% |
| Tonight | 77°F | Mostly Clear | 5 to 10 mph SE | 7% |
| Wednesday | 98°F | Mostly Sunny | 5 to 10 mph SE | 1% |
| Wednesday Night | 76°F | Mostly Clear | 5 to 10 mph SE | 1% |
| Thursday | 98°F | Mostly Sunny | 5 to 10 mph SE | 3% |
| Thursday Night | 76°F | Mostly Clear | 5 to 10 mph SE | 3% |
| Friday | 97°F | Mostly Sunny | 5 to 10 mph SE | 2% |
| Friday Night | 75°F | Mostly Clear | 5 to 10 mph SE | 5% |
| Saturday | 96°F | Sunny | 0 to 10 mph SE | 5% |
| Saturday Night | 75°F | Mostly Clear | 5 to 10 mph SE | 4% |
| Sunday | 96°F | Sunny | 5 to 10 mph SE | 4% |
| Sunday Night | 75°F | Mostly Clear | 5 to 10 mph SE | 2% |
| Monday | 97°F | Mostly Sunny | 5 to 10 mph SE | 4% |
| Monday Night | 76°F | Mostly Clear | 10 to 15 mph SE | 4% |
Forecast source: National Weather Service (api.weather.gov) for Castroville (29.360, -98.855). Updated through the day.
Growing snapshot for Castroville
Last spring frost
Feb 24
First fall frost
Dec 2
Growing season
283 days
Hardiness zone
9a
More local growing data for Castroville: nearby ZIP 78009 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lytle 3W, Tx (9.5 mi from Castroville). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.