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 PM CDT OCT 18, 2026
Clear
75°F
Feels Like: 75°F
Dewpoint: 57°F
Rel. Hum.: 54%
Visibility: 10 miles
Wind: N at 17 mph, gusts to 28
Pressure: 30.27 inches
Last 72 hours

Local Area Snow Depth

Texas Current Weather

Texas MOS Forecast Weather


Regional Weather Maps

(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 AM MDT 10/18/2026
Sunday
18 OCT 2026		 PORT ISABEL, TX 78578 weather forecast Day 1, 12 hours 1 PM 77° 79° Mostly Cloudy 40%
RAIN
.5–1 in		 0% Thunder
( 3% severe)		 N   17 60% 62°
High 78° PORT ISABEL, TX 78578 weather forecast Day 1, 15 hours 4 PM 77° 79° Mostly Cloudy N   17 69% 66°
Mostly Cloudy

Chance of Rain

 PORT ISABEL, TX 78578 weather forecast Day 1, 18 hours 7 PM 73° 73° Mostly Cloudy 44%
RAIN
***		 0% Thunder
( 2% severe)		 N   12 73% 64°
PORT ISABEL, TX 78578 weather forecast Day 1, 21 hours 10 PM 72° 72° Mostly Cloudy N   8 81% 66°
Monday
19 OCT 2026		 PORT ISABEL, TX 78578 weather forecast Day 2, 0 hours 1 AM 72° 72° Mostly Cloudy 4%

 0% Thunder
( 0% severe)		 NNW   6 87% 68°
Low 69° PORT ISABEL, TX 78578 weather forecast Day 2, 3 hours 4 AM 71° 71° Mostly Cloudy NNW   8 90% 68°
High 83° PORT ISABEL, TX 78578 weather forecast Day 2, 6 hours 7 AM 71° 71° Mostly Cloudy 10%
RAIN
<.01 in		 0% Thunder
( 3% severe)		 N   8 90% 68°

Mostly Cloudy

Chance of Rain

 PORT ISABEL, TX 78578 weather forecast Day 2, 9 hours 10 AM 78° 80° Mostly Cloudy N   10 79% 71°
PORT ISABEL, TX 78578 weather forecast Day 2, 12 hours 1 PM 82° 87° Mostly Cloudy 44%
RAIN
***		 0% Thunder
( 4% severe)		 NNE   15 72% 72°
PORT ISABEL, TX 78578 weather forecast Day 2, 15 hours 4 PM 82° 87° Mostly Cloudy NNE   15 74% 73°
PORT ISABEL, TX 78578 weather forecast Day 2, 18 hours 7 PM 77° 79° Mostly Cloudy 16%
RAIN
<.01 in		 0% Thunder
( 5% severe)		 NNE   12 82% 71°
PORT ISABEL, TX 78578 weather forecast Day 2, 21 hours 10 PM 76° 77° Partly Cloudy ENE   8 85% 71°
Tuesday
20 OCT 2026		 PORT ISABEL, TX 78578 weather forecast Day 3, 0 hours 1 AM 76° 76° Partly Cloudy 6%

 0% Thunder
( 4% severe)		 ENE   7 87% 72°
Low 73° PORT ISABEL, TX 78578 weather forecast Day 3, 3 hours 4 AM 75° 75° Partly Cloudy NE   8 90% 72°
High 85° PORT ISABEL, TX 78578 weather forecast Day 3, 6 hours 7 AM 75° 75° Clear 21%
RAIN
.25–.5 in		 0% Thunder
( 9% severe)		 NE   8 87% 71°

Partly Cloudy

Chance of Rain

 PORT ISABEL, TX 78578 weather forecast Day 3, 9 hours 10 AM 81° 86° Partly Cloudy NE   13 77% 73°
PORT ISABEL, TX 78578 weather forecast Day 3, 15 hours 1 PM 84° 90° Partly Cloudy 29%
RAIN
***		 0% Thunder
( 12% severe)		 NE   17 67% 72°
PORT ISABEL, TX 78578 weather forecast Day 3, 18 hours 4 PM 85° 92° Partly Cloudy NE   17 67% 73°
PORT ISABEL, TX 78578 weather forecast Day 3, 21 hours 7 PM 79° 82° Partly Cloudy     NE   14 79% 72°

PORT ISABEL, TX extended weather forecast
Wednesday
21 OCT 2026		 Thursday
22 OCT 2026		 Friday
23 OCT 2026		 Saturday
24 OCT 2026		 Sunday
25 OCT 2026
Low 72° Low 70° Low 68° Low 69° Low 67°
High 85° High 87° High 86° High 88° High 81°
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 <!--SEARCHED_TOWN_NAME--> weather forecast Day 8
Partly Cloudy
66% Rain		 Clear
9% Rain		 Clear
5% Rain		 Clear
15% Rain		 Partly Cloudy
26% Rain
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