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
98°F
Mostly Sunny
Mostly sunny, with a high near 98. Heat index values as high as 104. East southeast wind around 5 mph.
7-day forecast for Karnes City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Mostly Sunny | 5 mph ESE | 1% |
| Tonight | 72°F | Mostly Clear | 0 to 10 mph SE | 0% |
| Sunday | 99°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Sunday Night | 74°F | Partly Cloudy | 0 to 10 mph SE | 2% |
| Monday | 100°F | Sunny | 0 to 5 mph ESE | 14% |
| Monday Night | 74°F | Mostly Clear | 0 to 10 mph ESE | 14% |
| Tuesday | 99°F | Sunny then Slight Chance Showers And Thunderstorms | 0 to 10 mph ENE | 15% |
| Tuesday Night | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 10 mph E | 15% |
| Wednesday | 100°F | Sunny | 0 to 10 mph ENE | 12% |
| Wednesday Night | 74°F | Partly Cloudy | 0 to 10 mph E | 8% |
| Thursday | 99°F | Mostly Sunny | 0 to 10 mph ENE | 7% |
| Thursday Night | 73°F | Partly Cloudy | 0 to 10 mph E | 7% |
| Friday | 98°F | Mostly Sunny | 5 to 10 mph ENE | 7% |
| Friday Night | 71°F | Partly Cloudy | 0 to 10 mph E | 7% |
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 Sep 19, 2026.