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
4:53 PM CDT MAY 20, 2026
Clear 86°F
Feels Like:	93°F
Dewpoint:	73°F
Rel. Hum.:	65%
Visibility:	10 miles
Wind:	SSE at 16 mph
Pressure:	29.86 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 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 AM MDT 5/20/2026

DAY/DATE &
WEATHER FORECAST SUMMARY

Wednesday
20 MAY 2026

1 PM

87°

97°

Mostly Cloudy

15%
RAIN
<.01 in

0% Thunder
( 14% severe)

ESE 17

68%

75°

High 89°

4 PM

88°

98°

Mostly Cloudy

ESE 17

66%

75°

Mostly Cloudy

7 PM

83°

91°

Mostly Cloudy

8%

0% Thunder
( 8% severe)

ESE 15

80%

76°

10 PM

81°

88°

Mostly Cloudy

E 13

88%

77°

Thursday
21 MAY 2026

1 AM

81°

88°

Mostly Cloudy

21%
RAIN
.25–.5 in

0% Thunder
( 28% severe)

ESE 12

88%

77°

Low 78°

4 AM

80°

86°

Mostly Cloudy

SE 10

91%

77°

High 88°

7 AM

79°

83°

Mostly Cloudy

31%
RAIN
***

0% Thunder
( 34% severe)

SSE 7

91%

76°

Mostly Cloudy

Chance of Rain

10 AM

82°

89°

Mostly Cloudy

S 12

79%

75°

1 PM

84°

91°

Partly Cloudy

33%
RAIN
1–2 in

0% Thunder
( 35% severe)

SE 16

72%

74°

4 PM

86°

95°

Partly Cloudy

SE 16

70%

75°

7 PM

82°

89°

Mostly Cloudy

13%
RAIN
<.01 in

0% Thunder
( 16% severe)

SSE 15

79%

75°

10 PM

81°

87°

Mostly Cloudy

SE 10

82%

75°

Friday
22 MAY 2026

1 AM

80°

85°

Mostly Cloudy

14%
RAIN
<.01 in

0% Thunder
( 29% severe)

SSE 8

88%

76°

Low 78°

4 AM

79°

83°

Mostly Cloudy

SSE 9

88%

75°

High 90°

7 AM

79°

83°

Mostly Cloudy

13%
RAIN
<.01 in

0% Thunder
( 23% severe)

SSE 8

88%

75°

Mostly Cloudy

10 AM

85°

95°

Mostly Cloudy

SSE 10

75%

76°

1 PM

88°

98°

Partly Cloudy

9%

0% Thunder
( 24% severe)

SSE 17

66%

75°

4 PM

89°

101°

Partly Cloudy

SSE 18

66%

76°

7 PM

84°

94°

Partly Cloudy

SE 15

80%

77°


PORT ISABEL, TX extended weather forecast
Saturday 23 MAY 2026	Sunday 24 MAY 2026	Monday 25 MAY 2026	Tuesday 26 MAY 2026	Wednesday 27 MAY 2026
Low 77°	Low 70°	Low 75°	Low 75°	Low 74°
High 88°	High 87°	High 90°	High 90°	High 87°

Overcast 43% Rain	Overcast 72% Rain	Partly Cloudy 34% Rain	Partly Cloudy 24% Rain	Overcast 37% Rain

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