Port Isabel, TX Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Port Isabel, TX.

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Current Conditions — Port Isabel, TX

PORT ISABEL (KPIL)

Cloudy

78.8 F
Humidity:84%
Wind Speed: 16.1 mph
Barometer:29.74 in
Dewpoint:73.4 F
Visibility:10.00 mi
Precip:--
Heat Index:82.0 F
Wind Chill:NA
Apr 27 2026, 04:00 AM CDT
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5-Day Forecast — Port Isabel, TX

Monday

High 87 °F
Mostly Cloudy
Monday
Night
Low 75 °F
Mostly Cloudy
Tuesday

High 87 °F
Partly Sunny
Tuesday
Night
Low 75 °F
Partly Cloudy
Wednesday

High 87 °F
Partly Sunny
Wednesday
Night
Low 75 °F
Mostly Cloudy
Thursday

High 86 °F
Mostly Cloudy
Thursday
Night
Low 75 °F
Mostly Cloudy
Friday

High 86 °F
Partly Sunny

Detailed Forecast — Port Isabel, TX

Monday
Mostly Cloudy. High near 87°F. Wind 10 to 18 mph, with gusts as high as 23 mph.
Monday Night
Mostly Cloudy. Low around 75°F. Wind 10 to 13 mph, with gusts as high as 20 mph.
Tuesday
Partly Sunny. High near 87°F. Wind 13 to 20 mph, with gusts as high as 25 mph.
Tuesday Night
Partly Cloudy. Low around 75°F. Wind 12 to 15 mph, with gusts as high as 23 mph.
Wednesday
Partly Sunny. High near 87°F. Wind 14 to 18 mph, with gusts as high as 22 mph.
Wednesday Night
Mostly Cloudy. Low around 75°F. Wind around 8 mph, with gusts as high as 14 mph.
Thursday
Mostly Cloudy. High near 86°F. Wind around 17 mph, with gusts as high as 23 mph.
Thursday Night
Mostly Cloudy. Low around 75°F. Wind around 12 mph, with gusts as high as 18 mph.
Friday
Partly Sunny. High near 86°F. Wind 15 to 20 mph, with gusts as high as 25 mph.
Friday Night
Chance of Thunderstorms. Low around 71°F. Wind around 12 mph, with gusts as high as 18 mph.
Saturday
Chance of Thunderstorms. High near 82°F. Wind 17 to 21 mph, with gusts as high as 26 mph.
Saturday Night
Isolated T-storm. Low around 66°F. Wind around 13 mph, with gusts as high as 18 mph.
Sunday
Mostly Cloudy. High near 77°F. Wind 14 to 16 mph, with gusts as high as 20 mph.
TX Radar
Current Radar • TX
Day 1 Outlook • April 27, 2026

Observation History — Port Isabel, TX

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
04:00 AM CDT 16.1 10.00 Cloudy -- 78.8 73.4 84% NA 82.0 29.74 1007.1
03:50 AM CDT 16.1 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.74 1007.1
03:35 AM CDT 12.7 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.74 1007.1
03:25 AM CDT 12.7 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.74 1007.1
03:20 AM CDT 13.8 G 21.9 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.75 1007.5
03:15 AM CDT 12.7 G 18.4 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.74 1007.1
03:10 AM CDT 11.5 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.74 1007.1
03:05 AM CDT 10.4 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.75 1007.5
03:00 AM CDT 12.7 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.75 1007.5
02:35 AM CDT 11.5 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.75 1007.5
02:30 AM CDT SE 13.8 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.75 1007.5
02:20 AM CDT SE 12.7 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.75 1007.5
02:15 AM CDT 11.5 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.76 1007.8
02:10 AM CDT 13.8 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.76 1007.8
02:05 AM CDT 9.2 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.77 1008.1
02:00 AM CDT 9.2 9.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.77 1008.1
01:50 AM CDT 11.5 9.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.77 1008.1
01:45 AM CDT 13.8 9.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.77 1008.1
01:35 AM CDT SE 11.5 9.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.78 1008.5
01:30 AM CDT 10.4 9.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.78 1008.5
01:25 AM CDT 9.2 9.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.78 1008.5
01:20 AM CDT SE 9.2 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.78 1008.5
01:15 AM CDT SE 9.2 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.78 1008.5
01:10 AM CDT SE 10.4 10.00 Cloudy -- 78.8 75.2 89% NA 82.4 29.78 1008.5

Regional Weather Observation

PORT ISABEL (KPIL)

Cloudy
78.8 F

HARLINGEN (KHRL)

Mostly Cloudy
77.0 F

WESLACO MIDVALLY (KTXW)

Fog/Mist
77.4 F

BROWNSVILLE (KBRO)

Mostly Cloudy
78.8 F

EDINBURG INTL (KEBG)

Fog/Mist
75.2 F

MCALLEN (KMFE)

Mostly Cloudy
78.8 F
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