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
3:53 AM CDT JUL 20, 2026
Clear
Mist
81°F
Feels Like: 87°F
Dewpoint: 75°F
Rel. Hum.: 82%
Visibility: 1 miles
Wind: SSE at 7 mph
Pressure: 29.95 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  7/19/2026
Monday
20 JUL 2026		 PORT ISABEL, TX 78578 weather forecast Day 1, 0 hours 1 AM 81° 87° Clear 0%

 0% Thunder
( 1% severe)		 SSE   13 85% 76°
Low 77° PORT ISABEL, TX 78578 weather forecast Day 1, 3 hours 4 AM 80° 85° Clear SSE   12 88% 76°
High 97° PORT ISABEL, TX 78578 weather forecast Day 1, 6 hours 7 AM 78° 81° Partly Cloudy 0%

 0% Thunder
( 4% severe)		 S   12 94% 76°

Clear



 PORT ISABEL, TX 78578 weather forecast Day 1, 9 hours 10 AM 88° 98° Clear S   13 66% 75°
PORT ISABEL, TX 78578 weather forecast Day 1, 12 hours 1 PM 97° 106° Clear 0%

 0% Thunder
( 6% severe)		 SSE   17 45% 72°
PORT ISABEL, TX 78578 weather forecast Day 1, 15 hours 4 PM 95° 105° Clear SE   20 49% 73°
PORT ISABEL, TX 78578 weather forecast Day 1, 18 hours 7 PM 88° 97° Clear 0%

 0% Thunder
( 3% severe)		 SE   17 63% 74°
PORT ISABEL, TX 78578 weather forecast Day 1, 21 hours 10 PM 82° 89° Partly Cloudy SSE   13 82% 76°
Tuesday
21 JUL 2026		 PORT ISABEL, TX 78578 weather forecast Day 2, 0 hours 1 AM 80° 85° Partly Cloudy 0%

 0% Thunder
( 3% severe)		 SSE   10 88% 76°
Low 77° PORT ISABEL, TX 78578 weather forecast Day 2, 3 hours 4 AM 79° 83° Partly Cloudy S   9 91% 76°
High 96° PORT ISABEL, TX 78578 weather forecast Day 2, 6 hours 7 AM 77° 78° Partly Cloudy 0%

 0% Thunder
( 5% severe)		 S   8 94% 75°

Partly Cloudy



 PORT ISABEL, TX 78578 weather forecast Day 2, 9 hours 10 AM 88° 98° Partly Cloudy SSE   10 66% 75°
PORT ISABEL, TX 78578 weather forecast Day 2, 12 hours 1 PM 95° 105° Clear 0%

 0% Thunder
( 8% severe)		 SE   15 49% 73°
PORT ISABEL, TX 78578 weather forecast Day 2, 15 hours 4 PM 95° 105° Partly Cloudy SE   17 49% 73°
PORT ISABEL, TX 78578 weather forecast Day 2, 18 hours 7 PM 89° 97° Partly Cloudy 0%

 0% Thunder
( 3% severe)		 SE   15 59% 73°
PORT ISABEL, TX 78578 weather forecast Day 2, 21 hours 10 PM 82° 89° Clear SSE   12 79% 75°

PORT ISABEL, TX extended weather forecast
Wednesday
22 JUL 2026		 Thursday
23 JUL 2026		 Friday
24 JUL 2026		 Saturday
25 JUL 2026		 Sunday
26 JUL 2026
Low 77° Low 72° Low 79° Low 80° Low 79°
High 95° High 88° High 93° High 94° High 91°
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
10% Rain		 Overcast
42% Rain		 Clear
17% Rain		 Clear
11% Rain		 Clear
16% Rain
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