Karnes City, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Karnes City, a city in Karnes County, Texas.
Today
99°F
Sunny
Sunny, with a high near 99. Heat index values as high as 107. South southeast wind 5 to 15 mph, with gusts as high as 25 mph.
7-day forecast for Karnes City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 5 to 15 mph SSE | 3% |
| Tonight | 76°F | Mostly Clear | 5 to 15 mph SE | 3% |
| Wednesday | 99°F | Mostly Sunny | 5 to 15 mph SSE | 1% |
| Wednesday Night | 75°F | Mostly Clear | 5 to 15 mph SE | 1% |
| Thursday | 99°F | Sunny | 5 to 15 mph SSE | 6% |
| Thursday Night | 76°F | Mostly Clear | 5 to 15 mph SSE | 6% |
| Friday | 98°F | Mostly Sunny | 0 to 10 mph SE | 12% |
| Friday Night | 75°F | Partly Cloudy then Slight Chance Rain Showers | 0 to 15 mph SE | 15% |
| Saturday | 97°F | Slight Chance Rain Showers then Sunny | 0 to 10 mph SE | 15% |
| Saturday Night | 75°F | Mostly Clear | 0 to 10 mph SE | 6% |
| Sunday | 96°F | Sunny | 0 to 10 mph SE | 10% |
| Sunday Night | 75°F | Mostly Clear | 5 to 15 mph SE | 10% |
| Monday | 97°F | Mostly Sunny | 5 to 15 mph SE | 8% |
| Monday Night | 75°F | Mostly Clear | 10 to 15 mph SSE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Karnes City (28.885, -97.901). Updated through the day.
Growing snapshot for Karnes City
Last spring frost
Feb 16
First fall frost
Dec 9
Growing season
300 days
Hardiness zone
9a
More local growing data for Karnes City: nearby ZIP 78118 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Karnes City 2N, Tx (4.3 mi from Karnes City). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.