Port Lavaca, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Lavaca, a city in Calhoun County, Texas.
Today
93°F
Sunny
Sunny, with a high near 93. Heat index values as high as 109. South wind 5 to 14 mph, with gusts as high as 18 mph.
7-day forecast for Port Lavaca
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 93°F | Sunny | 5 to 14 mph S | 3% |
| Tonight | 78°F | Mostly Clear | 6 to 14 mph SSE | 1% |
| Wednesday | 93°F | Sunny | 6 to 13 mph SSE | 1% |
| Wednesday Night | 78°F | Mostly Clear | 6 to 13 mph SSE | 0% |
| Thursday | 93°F | Sunny | 5 to 13 mph SSE | 7% |
| Thursday Night | 78°F | Mostly Clear | 3 to 13 mph SSE | 7% |
| Friday | 93°F | Slight Chance Showers And Thunderstorms | 2 to 12 mph SSE | 20% |
| Friday Night | 78°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 2 to 13 mph SSE | 19% |
| Saturday | 91°F | Slight Chance Showers And Thunderstorms | 2 to 13 mph SE | 19% |
| Saturday Night | 79°F | Mostly Clear | 3 to 13 mph SSE | 14% |
| Sunday | 90°F | Slight Chance Showers And Thunderstorms | 2 to 13 mph SE | 21% |
| Sunday Night | 79°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 13 mph SSE | 15% |
| Monday | 91°F | Slight Chance Showers And Thunderstorms | 5 to 14 mph SSE | 17% |
| Monday Night | 80°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 8 to 14 mph SSE | 16% |
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 Aug 4, 2026.