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
5:53 AM CDT AUG 18, 2025
Clear
Mist
79°F
Feels Like: 84°F
Dewpoint: 79°F
Rel. Hum.: 100%
Visibility: 5 miles
Wind: Calm
Pressure: 29.92 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
2025 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  8/17/2025
Monday
18 AUG 2025		 PORT ISABEL, TX 78578 weather forecast Day 1, 0 hours 1 AM 81° 89° Clear 1%

 0% Thunder
( 7% severe)		 SE   5 91% 78°
Low 77° PORT ISABEL, TX 78578 weather forecast Day 1, 3 hours 4 AM 79° 84° Clear SSE   2 97% 78°
High 92° PORT ISABEL, TX 78578 weather forecast Day 1, 6 hours 7 AM 78° 81° Partly Cloudy 3%

 0% Thunder
( 15% severe)		 SE   1 97% 77°

Partly Cloudy



 PORT ISABEL, TX 78578 weather forecast Day 1, 9 hours 10 AM 86° 98° Partly Cloudy ESE   3 77% 78°
PORT ISABEL, TX 78578 weather forecast Day 1, 12 hours 1 PM 90° 103° Clear 4%

 0% Thunder
( 21% severe)		 E   10 66% 77°
PORT ISABEL, TX 78578 weather forecast Day 1, 15 hours 4 PM 90° 103° Clear E   13 66% 77°
PORT ISABEL, TX 78578 weather forecast Day 1, 18 hours 7 PM 87° 99° Clear 1%

 0% Thunder
( 7% severe)		 E   10 72% 77°
PORT ISABEL, TX 78578 weather forecast Day 1, 21 hours 10 PM 83° 93° Clear ESE   5 85% 78°
Tuesday
19 AUG 2025		 PORT ISABEL, TX 78578 weather forecast Day 2, 0 hours 1 AM 81° 89° Clear 2%

 0% Thunder
( 13% severe)		 SE   1 91% 78°
Low 76° PORT ISABEL, TX 78578 weather forecast Day 2, 3 hours 4 AM 79° 83° Clear   CALM 94% 77°
High 92° PORT ISABEL, TX 78578 weather forecast Day 2, 6 hours 7 AM 77° 78° Partly Cloudy 10%
RAIN
<.01 in		 0% Thunder
( 17% severe)		   CALM 97% 76°

Partly Cloudy



 PORT ISABEL, TX 78578 weather forecast Day 2, 9 hours 10 AM 85° 96° Partly Cloudy NE   2 77% 77°
PORT ISABEL, TX 78578 weather forecast Day 2, 12 hours 1 PM 89° 101° Partly Cloudy 10%
RAIN
<.01 in		 0% Thunder
( 22% severe)		 ENE   8 66% 76°
PORT ISABEL, TX 78578 weather forecast Day 2, 15 hours 4 PM 90° 102° Partly Cloudy ENE   12 64% 76°
PORT ISABEL, TX 78578 weather forecast Day 2, 18 hours 7 PM 86° 96° Clear 3%

 0% Thunder
( 7% severe)		 E   9 72% 76°
PORT ISABEL, TX 78578 weather forecast Day 2, 21 hours 10 PM 83° 92° Clear ESE   3 82% 77°

PORT ISABEL, TX extended weather forecast
Wednesday
20 AUG 2025		 Thursday
21 AUG 2025		 Friday
22 AUG 2025		 Saturday
23 AUG 2025		 Sunday
24 AUG 2025
Low 77° Low 75° Low 76° Low 77° Low 77°
High 93° High 92° High 93° High 92° High 92°
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
19% Rain		 Partly Cloudy
22% Rain		 Partly Cloudy
25% Rain		 Partly Cloudy
29% Rain		 Partly Cloudy
28% Rain
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