PORT ISABEL, TX 78578 Weather Forecast & Current Conditions
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  78578 WEATHER WARNINGS (SEVERE T-STORM & TORNADO)
 CURRENT WEATHER

PORT ISABEL, TX
Current Weather
10:53 AM CDT SEP 18, 2026
Scattered Clouds
90°F
Feels Like: 106°F
Dewpoint: 79°F
Rel. Hum.: 70%
Visibility: 10 miles
Wind: NE at 6 mph
Pressure: 30.07 inches
Last 72 hours

Local Area Snow Depth

Texas Current Weather

Texas MOS Forecast Weather


Weather Map

(Automated weather data from NWS/FAA)
  78578 WEATHER FORECAST
10-Day model forecast maps
2026 Hurricanes

PORT ISABEL, TX 78578
Weather Forecast

 Snowfall Forecast pages
Snow Depth pages
TODAY
Cloudy this morning, then becoming partly sunny. Patchy fog this morning. Highs in the lower 80s. Southeast winds 5 to 10 mph.
TONIGHT
Mostly cloudy. Lows in the upper 60s. East winds 5 to 10 mph, becoming south after midnight.
WEDNESDAY
Partly sunny in the morning, then clearing. Breezy with highs around 90. Southwest winds 5 to 10 mph, increasing to southeast 20 to 25 mph with gusts up to 35 mph in the afternoon.
WEDNESDAY NIGHT
Mostly clear and breezy and less humid with lows in the mid 60s. Northeast winds 15 to 25 mph with gusts up to 40 mph.
THURSDAY
Sunny, breezy and much cooler with highs in the mid 70s. Northeast winds 15 to 25 mph with gusts up to 35 mph.
THURSDAY NIGHT
Partly cloudy. Lows in the upper 50s.
FRIDAY
Sunny. Highs in the mid 70s.
FRIDAY NIGHT AND SATURDAY
Partly cloudy and breezy. Lows around 60. Highs in the upper 70s.
SATURDAY NIGHT THROUGH SUNDAY NIGHT
Partly cloudy and windy. Lows in the upper 60s. Highs in the upper 70s.
MONDAY
Partly sunny and breezy. Highs in the lower 80s.

  78578 WEATHER SATELLITE LOOPS
Visible Weather Satellite
PORT ISABEL, TX 78578
Infrared Weather Satellite
PORT ISABEL, TX 78578
  78578 WEATHER RADAR LOOP
NEXRAD Weather Radar
PORT ISABEL, TX 78578
 MOS COMPUTER WEATHER FORECAST

PORT ISABEL, TX 3 hourly weather forecast
weather forecast created  6:00 PM MDT  9/17/2026
Friday
18 SEP 2026		 PORT ISABEL, TX 78578 weather forecast Day 1, 0 hours 1 AM 82° 91° Partly Cloudy 41%
RAIN
***		 0% Thunder
( 22% severe)		 E   3 88% 78°
Low 78° PORT ISABEL, TX 78578 weather forecast Day 1, 3 hours 4 AM 80° 86° Partly Cloudy   CALM 94% 78°
High 93° PORT ISABEL, TX 78578 weather forecast Day 1, 6 hours 7 AM 79° 83° Partly Cloudy 30%
RAIN
.1–.25 in		 0% Thunder
( 29% severe)		 NNE   2 94% 77°

Partly Cloudy

Chance of Rain

 PORT ISABEL, TX 78578 weather forecast Day 1, 9 hours 10 AM 88° 100° Partly Cloudy ENE   5 70% 77°
PORT ISABEL, TX 78578 weather forecast Day 1, 12 hours 1 PM 92° 105° Partly Cloudy 7%

 0% Thunder
( 32% severe)		 ENE   12 60% 76°
PORT ISABEL, TX 78578 weather forecast Day 1, 15 hours 4 PM 92° 106° Partly Cloudy ENE   14 62% 77°
PORT ISABEL, TX 78578 weather forecast Day 1, 18 hours 7 PM 87° 99° Partly Cloudy 1%

 0% Thunder
( 7% severe)		 E   10 72% 77°
PORT ISABEL, TX 78578 weather forecast Day 1, 21 hours 10 PM 84° 94° Clear E   6 80% 77°
Saturday
19 SEP 2026		 PORT ISABEL, TX 78578 weather forecast Day 2, 0 hours 1 AM 82° 89° Clear 5%

 0% Thunder
( 14% severe)		   CALM 82% 76°
Low 78° PORT ISABEL, TX 78578 weather forecast Day 2, 3 hours 4 AM 80° 85° Clear   CALM 88% 76°
High 94° PORT ISABEL, TX 78578 weather forecast Day 2, 6 hours 7 AM 78° 81° Partly Cloudy 4%

 0% Thunder
( 17% severe)		   CALM 94% 76°

Partly Cloudy



 PORT ISABEL, TX 78578 weather forecast Day 2, 9 hours 10 AM 88° 98° Clear   CALM 66% 75°
PORT ISABEL, TX 78578 weather forecast Day 2, 12 hours 1 PM 92° 102° Partly Cloudy 6%

 0% Thunder
( 24% severe)		 ENE   10 56% 74°
PORT ISABEL, TX 78578 weather forecast Day 2, 15 hours 4 PM 92° 103° Partly Cloudy E   13 58% 75°
PORT ISABEL, TX 78578 weather forecast Day 2, 18 hours 7 PM 87° 98° Partly Cloudy 0%

 0% Thunder
( 8% severe)		 E   10 70% 76°
PORT ISABEL, TX 78578 weather forecast Day 2, 21 hours 10 PM 84° 94° Clear ESE   7 80% 77°

PORT ISABEL, TX extended weather forecast
Sunday
20 SEP 2026		 Monday
21 SEP 2026		 Tuesday
22 SEP 2026		 Wednesday
23 SEP 2026		 Thursday
24 SEP 2026
Low 77° Low 77° Low 77° Low 77° Low 77°
High 93° High 93° High 92° High 92° High 90°
PORT ISABEL, TX 78578 weather forecast Day 3 PORT ISABEL, TX 78578 weather forecast Day 4 PORT ISABEL, TX 78578 weather forecast Day 5 PORT ISABEL, TX 78578 weather forecast Day 6 PORT ISABEL, TX 78578 weather forecast Day 7
Clear
17% Rain		 Clear
18% Rain		 Partly Cloudy
28% Rain		 Partly Cloudy
30% Rain		 Partly Cloudy
33% Rain
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