Port Isabel, TX Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Isabel, a city in Cameron County, Texas.
This Afternoon
93°F
Mostly Sunny
Mostly sunny. High near 93, with temperatures falling to around 89 in the afternoon. East wind around 13 mph.
7-day forecast for Port Isabel
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 93°F | Mostly Sunny | 13 mph E | 7% |
| Tonight | 79°F | Mostly Clear | 1 to 12 mph E | 12% |
| Saturday | 93°F | Slight Chance Rain Showers then Sunny | 1 to 12 mph NE | 16% |
| Saturday Night | 79°F | Mostly Clear | 2 to 10 mph ESE | 0% |
| Sunday | 94°F | Sunny | 2 to 12 mph SE | 4% |
| Sunday Night | 80°F | Partly Cloudy | 3 to 12 mph SE | 4% |
| Monday | 94°F | Sunny | 1 to 12 mph SE | 11% |
| Monday Night | 80°F | Mostly Clear | 3 to 12 mph ESE | 11% |
| Tuesday | 90°F | Chance Showers And Thunderstorms | 2 to 14 mph ESE | 27% |
| Tuesday Night | 81°F | Chance Showers And Thunderstorms then Mostly Clear | 3 to 14 mph E | 27% |
| Wednesday | 90°F | Chance Showers And Thunderstorms | 3 to 15 mph E | 30% |
| Wednesday Night | 81°F | Chance Showers And Thunderstorms then Mostly Clear | 6 to 14 mph E | 30% |
| Thursday | 89°F | Chance Showers And Thunderstorms | 6 to 16 mph ENE | 37% |
| Thursday Night | 81°F | Chance Showers And Thunderstorms | 7 to 16 mph ENE | 37% |
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 Sep 19, 2026.