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
12:53 AM CDT AUG 19, 2026
Clear
81°F
Feels Like: 87°F
Dewpoint: 75°F
Rel. Hum.: 82%
Visibility: 10 miles
Wind: S at 6 mph
Pressure: 30.03 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  8/18/2026
Wednesday
19 AUG 2026		 PORT ISABEL, TX 78578 weather forecast Day 1, 0 hours 1 AM 82° 89° Partly Cloudy 1%

 0% Thunder
( 4% severe)		 SSE   8 82% 76°
Low 79° PORT ISABEL, TX 78578 weather forecast Day 1, 3 hours 4 AM 81° 88° Partly Cloudy SSE   7 88% 77°
High 96° PORT ISABEL, TX 78578 weather forecast Day 1, 6 hours 7 AM 80° 85° Mostly Cloudy 1%

 0% Thunder
( 8% severe)		 SE   7 88% 76°

Mostly Cloudy



 PORT ISABEL, TX 78578 weather forecast Day 1, 9 hours 10 AM 89° 101° Mostly Cloudy SSE   12 66% 76°
PORT ISABEL, TX 78578 weather forecast Day 1, 12 hours 1 PM 94° 106° Partly Cloudy 1%

 0% Thunder
( 9% severe)		 SSE   15 54% 75°
PORT ISABEL, TX 78578 weather forecast Day 1, 15 hours 4 PM 95° 107° Partly Cloudy SE   17 53% 75°
PORT ISABEL, TX 78578 weather forecast Day 1, 18 hours 7 PM 90° 102° Partly Cloudy 0%

 0% Thunder
( 2% severe)		 SE   16 64% 76°
PORT ISABEL, TX 78578 weather forecast Day 1, 21 hours 10 PM 85° 97° Partly Cloudy SSE   13 80% 78°
Thursday
20 AUG 2026		 PORT ISABEL, TX 78578 weather forecast Day 2, 0 hours 1 AM 83° 93° Partly Cloudy 4%

 0% Thunder
( 5% severe)		 SSE   10 85% 78°
Low 81° PORT ISABEL, TX 78578 weather forecast Day 2, 3 hours 4 AM 82° 91° Partly Cloudy SSE   9 88% 78°
High 97° PORT ISABEL, TX 78578 weather forecast Day 2, 6 hours 7 AM 81° 88° Partly Cloudy 3%

 0% Thunder
( 11% severe)		 SSE   9 88% 77°

Partly Cloudy



 PORT ISABEL, TX 78578 weather forecast Day 2, 9 hours 10 AM 89° 102° Mostly Cloudy SSE   13 68% 77°
PORT ISABEL, TX 78578 weather forecast Day 2, 12 hours 1 PM 95° 108° Partly Cloudy 0%

 0% Thunder
( 14% severe)		 SSE   17 54% 76°
PORT ISABEL, TX 78578 weather forecast Day 2, 15 hours 4 PM 95° 108° Clear SE   18 54% 76°
PORT ISABEL, TX 78578 weather forecast Day 2, 18 hours 7 PM 90° 103° Clear 0%

 0% Thunder
( 5% severe)		 SE   16 66% 77°
PORT ISABEL, TX 78578 weather forecast Day 2, 21 hours 10 PM 85° 97° Partly Cloudy SSE   13 80% 78°

PORT ISABEL, TX extended weather forecast
Friday
21 AUG 2026		 Saturday
22 AUG 2026		 Sunday
23 AUG 2026		 Monday
24 AUG 2026		 Tuesday
25 AUG 2026
Low 80° Low 78° Low 77° Low 78° Low 77°
High 96° High 94° High 93° High 94° High 94°
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
11% Rain		 Clear
12% Rain		 Clear
16% Rain		 Clear
17% Rain		 Clear
12% Rain
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