Port Lavaca, TX Weather & Growing Conditions
Overnight
79°F
Slight Chance Rain Showers
A slight chance of rain showers after 5am. Mostly clear, with a low around 79. Heat index values as high as 89. East wind around 7 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 79°F | Slight Chance Rain Showers | 7 mph E | 16% |
| Saturday | 89°F | Sunny | 3 to 14 mph ENE | 12% |
| Saturday Night | 79°F | Mostly Clear | 3 to 14 mph SSE | 1% |
| Sunday | 89°F | Sunny | 2 to 13 mph E | 10% |
| Sunday Night | 80°F | Partly Cloudy | 3 to 13 mph SE | 2% |
| Monday | 90°F | Slight Chance Showers And Thunderstorms | 2 to 12 mph SE | 19% |
| Monday Night | 80°F | Slight Chance Showers And Thunderstorms then Clear | 2 to 12 mph SE | 19% |
| Tuesday | 91°F | Sunny | 2 to 12 mph ENE | 13% |
| Tuesday Night | 80°F | Mostly Clear | 2 to 12 mph ESE | 13% |
| Wednesday | 91°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 14 mph ENE | 21% |
| Wednesday Night | 80°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 to 14 mph E | 21% |
| Thursday | 90°F | Sunny then Slight Chance Showers And Thunderstorms | 8 to 15 mph ENE | 18% |
| Thursday Night | 79°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 6 to 15 mph E | 18% |
| Friday | 90°F | Sunny then Slight Chance Showers And Thunderstorms | 9 to 14 mph ENE | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Port Lavaca, TX
Last spring frost
Feb 1
First fall frost
Dec 21
Growing season
321 days
Hardiness zone
9b
Explore more for Port Lavaca, TX: full frost dates · planting calendar · Texas frost dates
Climate data from the nearest NOAA station, Pt Comfort, Tx (5.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.