Port Lavaca, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Lavaca, a city in Calhoun County, Texas.
Overnight
76°F
Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly clear, with a low around 76. Heat index values as high as 85. East wind around 3 mph. Chance of precipitation is 20%.
7-day forecast for Port Lavaca
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 76°F | Slight Chance Rain Showers | 3 mph E | 15% |
| Saturday | 93°F | Sunny | 2 to 13 mph ENE | 12% |
| Saturday Night | 77°F | Mostly Clear | 1 to 13 mph SE | 1% |
| Sunday | 93°F | Sunny | 1 to 12 mph E | 11% |
| Sunday Night | 77°F | Partly Cloudy | 2 to 12 mph SE | 2% |
| Monday | 94°F | Slight Chance Showers And Thunderstorms | 1 to 10 mph ESE | 20% |
| Monday Night | 77°F | Slight Chance Showers And Thunderstorms then Clear | 1 to 10 mph SE | 20% |
| Tuesday | 95°F | Sunny | 1 to 10 mph ENE | 13% |
| Tuesday Night | 78°F | Mostly Clear | 0 to 12 mph E | 13% |
| Wednesday | 93°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 14 mph ENE | 21% |
| Wednesday Night | 78°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 to 14 mph E | 21% |
| Thursday | 92°F | Sunny then Slight Chance Showers And Thunderstorms | 7 to 15 mph ENE | 18% |
| Thursday Night | 77°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 to 15 mph E | 18% |
| Friday | 92°F | Sunny | 8 to 14 mph ENE | 14% |
Forecast source: National Weather Service (api.weather.gov) for Port Lavaca (28.618, -96.628). Updated through the day.
Growing snapshot for Port Lavaca
Last spring frost
Feb 1
First fall frost
Dec 21
Growing season
321 days
Hardiness zone
9b
More local growing data for Port Lavaca: nearby ZIP 77979 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Pt Comfort, Tx (5.1 mi from Port Lavaca). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.