Port Isabel, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Isabel, a city in Cameron County, Texas.
Tonight
72°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Northwest wind 3 to 14 mph. Chance of precipitation is 40%.
7-day forecast for Port Isabel
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Chance Showers And Thunderstorms | 3 to 14 mph NW | 43% |
| Wednesday | 79°F | Mostly Sunny | 12 to 15 mph NNE | 11% |
| Wednesday Night | 71°F | Mostly Clear | 3 to 9 mph E | 2% |
| Thursday | 85°F | Mostly Sunny | 6 to 13 mph SSE | 7% |
| Thursday Night | 72°F | Showers And Thunderstorms Likely | 3 to 9 mph SSW | 65% |
| Friday | 80°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 6 to 20 mph N | 75% |
| Friday Night | 70°F | Chance Rain Showers | 9 to 15 mph N | 41% |
| Saturday | 77°F | Showers And Thunderstorms Likely | 12 to 17 mph N | 55% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 14 to 17 mph N | 47% |
| Sunday | 74°F | Chance Showers And Thunderstorms | 21 mph N | 39% |
| Sunday Night | 65°F | Slight Chance Rain Showers | 10 to 17 mph N | 24% |
| Monday | 74°F | Mostly Sunny | 10 to 14 mph NNE | 7% |
| Monday Night | 65°F | Partly Cloudy | 5 to 9 mph ENE | 1% |
| Tuesday | 76°F | Mostly Sunny | 5 to 13 mph E | 1% |
Forecast source: National Weather Service (api.weather.gov) for Port Isabel (26.063, -97.247). Updated through the day.
Growing snapshot for Port Isabel
Last spring frost
Jan 3
First fall frost
Jan 1
Growing season
365 days
Hardiness zone
10a
More local growing data for Port Isabel: nearby ZIP 78578 weather · frost dates · planting calendar · Texas frost dates
Nearby towns & communities
Arroyo Colorado Estates
Arroyo Gardens
Bayview
Bixby
Bluetown
Brownsville
Cameron Park
Chula Vista
Combes
Del Mar Heights
El Camino Angosto
Encantada-Ranchito-El Calaboz
Green Valley Farms
Harlingen
Iglesia Antigua
Indian Lake
Juarez
La Feria
La Feria North
La Paloma
La Tina Ranch
Lago
Laguna Heights
Laguna Vista
Las Palmas II
Lasana
Laureles
Los Fresnos
Los Indios
Lozano
Climate data from the nearest NOAA station, Port Isabel, Tx (3.5 mi from Port Isabel). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.