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Current weather in Port Isabel is clear sky.

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This page shows hourly weather forecast for Port Isabel, including temperature, wind, precipitation, humidity and cloud cover.

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Weather data for Port Isabel is updated regularly with the latest available observations and forecasts.

Now · 7:58 AM

Port Isabel Weather & Hourly Forecast

United States · Texas · 78578

85°F

Sunny

Feels like: 91°F

💧 Humidity 67% 🌡 Pressure 29.94 inHg 💨 Wind 5 mph 👁 Visibility 13.4 mi ☁ Clouds 12% ☀️ UV index 0.0 · Low 🌅 Sunrise 7:17 AM 🌇 Sunset 7:25 PM

Hourly Forecast for Port Isabel

Today

8:00 AM

Sunny

85° 💧 0.004 in 💨 5 mph H 67%29.94 inHg

11:00 AM

Mostly cloudy

90° 💧 0.005 in 💨 11 mph H 56%29.97 inHg

2:00 PM

Mostly cloudy

91° 💧 0.009 in 💨 13 mph H 54%29.97 inHg

5:00 PM

Mostly sunny

89° 💧 0.001 in 💨 13 mph H 60%29.91 inHg

8:00 PM

Clear night

86° 💧 None 💨 11 mph H 68%29.94 inHg

11:00 PM

Mostly cloudy night

85° 💧 0.002 in 💨 9 mph H 70%30.00 inHg

Tomorrow

2:00 AM

Partly cloudy night

84° 💧 0.003 in 💨 8 mph H 71%29.97 inHg

5:00 AM

Partly cloudy night

83° 💧 0.016 in 💨 7 mph H 75%29.94 inHg

8:00 AM

Light rain

81° 💧 0.008 in 💨 3 mph H 84%29.97 inHg

11:00 AM

Light rain

89° 💧 0.010 in 💨 9 mph H 61%30.00 inHg

2:00 PM

Mostly sunny

91° 💧 0.013 in 💨 10 mph H 57%29.97 inHg

5:00 PM

Sunny

88° 💧 0.008 in 💨 13 mph H 66%29.91 inHg

8:00 PM

Clear night

84° 💧 0.004 in 💨 11 mph H 76%29.94 inHg

11:00 PM

Light rain

82° 💧 0.038 in 💨 9 mph H 86%30.00 inHg

Friday

2:00 AM

Overcast night

80° 💧 0.054 in 💨 4 mph H 88%29.97 inHg

5:00 AM

Mostly clear night

79° 💧 0.004 in 💨 5 mph H 91%29.97 inHg

Today

8:00 AM

Sunny

85° 💧 None 💨 5 mph H 67%29.94 inHg

9:00 AM

Partly cloudy

88° 💧 0.001 in 💨 8 mph H 59%29.97 inHg

10:00 AM

Mostly sunny

89° 💧 0.003 in 💨 10 mph H 58%29.97 inHg

11:00 AM

Mostly cloudy

90° 💧 0.001 in 💨 11 mph H 56%29.97 inHg

12:00 PM

Mostly cloudy

91° 💧 0.001 in 💨 12 mph H 55%30.00 inHg

1:00 PM

Overcast

91° 💧 0.003 in 💨 13 mph H 55%29.97 inHg

2:00 PM

Mostly cloudy

91° 💧 0.002 in 💨 13 mph H 54%29.97 inHg

3:00 PM

Mostly cloudy

91° 💧 0.004 in 💨 14 mph H 56%29.94 inHg

4:00 PM

Mostly cloudy

90° 💧 0.003 in 💨 14 mph H 59%29.94 inHg

5:00 PM

Mostly sunny

89° 💧 0.001 in 💨 13 mph H 60%29.91 inHg

6:00 PM

Sunny

88° 💧 None 💨 13 mph H 63%29.91 inHg

7:00 PM

Sunny

86° 💧 None 💨 12 mph H 66%29.91 inHg

8:00 PM

Clear night

86° 💧 None 💨 11 mph H 68%29.94 inHg

9:00 PM

Mostly clear night

85° 💧 None 💨 10 mph H 69%29.94 inHg

10:00 PM

Mostly cloudy night

85° 💧 None 💨 10 mph H 70%29.97 inHg

11:00 PM

Mostly cloudy night

85° 💧 0.001 in 💨 9 mph H 70%30.00 inHg

Tomorrow

12:00 AM

Mostly cloudy night

85° 💧 0.001 in 💨 9 mph H 71%30.00 inHg

1:00 AM

Mostly cloudy night

84° 💧 0.001 in 💨 8 mph H 71%29.97 inHg

2:00 AM

Partly cloudy night

84° 💧 0.002 in 💨 8 mph H 71%29.97 inHg

3:00 AM

Mostly cloudy night

84° 💧 None 💨 6 mph H 71%29.94 inHg

4:00 AM

Mostly cloudy night

84° 💧 0.001 in 💨 6 mph H 72%29.94 inHg

5:00 AM

Partly cloudy night

83° 💧 0.004 in 💨 7 mph H 75%29.94 inHg

6:00 AM

Mostly clear night

83° 💧 0.002 in 💨 6 mph H 77%29.94 inHg

7:00 AM

Light rain

80° 💧 0.010 in 💨 8 mph H 84%29.97 inHg

8:00 AM

Light rain

81° 💧 0.005 in 💨 3 mph H 84%29.97 inHg

9:00 AM

Sunny

84° 💧 0.001 in 💨 3 mph H 74%30.00 inHg

10:00 AM

Mostly sunny

87° 💧 0.002 in 💨 6 mph H 66%30.00 inHg

11:00 AM

Light rain

89° 💧 0.004 in 💨 9 mph H 61%30.00 inHg

12:00 PM

Mostly sunny

90° 💧 0.004 in 💨 10 mph H 59%30.00 inHg

1:00 PM

Mostly sunny

91° 💧 0.002 in 💨 9 mph H 58%30.00 inHg

2:00 PM

Mostly sunny

91° 💧 0.004 in 💨 10 mph H 57%29.97 inHg

3:00 PM

Sunny

91° 💧 0.001 in 💨 11 mph H 58%29.94 inHg

4:00 PM

Light rain

89° 💧 0.009 in 💨 13 mph H 64%29.91 inHg

5:00 PM

Sunny

88° 💧 0.003 in 💨 13 mph H 66%29.91 inHg

6:00 PM

Sunny

87° 💧 0.002 in 💨 13 mph H 69%29.91 inHg

7:00 PM

Sunny

85° 💧 0.002 in 💨 12 mph H 73%29.94 inHg

8:00 PM

Clear night

84° 💧 None 💨 11 mph H 76%29.94 inHg

9:00 PM

Clear night

84° 💧 0.001 in 💨 10 mph H 78%29.94 inHg

10:00 PM

Mostly cloudy night

83° 💧 0.004 in 💨 9 mph H 80%29.97 inHg

11:00 PM

Light rain

82° 💧 0.024 in 💨 9 mph H 86%30.00 inHg

Friday

12:00 AM

Light rain

81° 💧 0.008 in 💨 9 mph H 87%30.00 inHg

1:00 AM

Light rain

80° 💧 0.006 in 💨 8 mph H 87%30.00 inHg

2:00 AM

Overcast night

80° 💧 None 💨 4 mph H 88%29.97 inHg

3:00 AM

Light rain

78° 💧 0.031 in 💨 6 mph H 91%29.97 inHg

4:00 AM

Light rain

79° 💧 0.023 in 💨 3 mph H 91%29.97 inHg

5:00 AM

Mostly clear night

79° 💧 0.002 in 💨 5 mph H 91%29.97 inHg

6:00 AM

Mostly clear night

79° 💧 0.002 in 💨 5 mph H 91%29.97 inHg

7:00 AM

Clear night

79° 💧 0.001 in 💨 3 mph H 92%29.97 inHg

8:00 AM

Sunny

80° 💧 0.001 in 💨 3 mph H 89%29.97 inHg

9:00 AM

Sunny

83° 💧 None 💨 3 mph H 81%30.00 inHg

10:00 AM

Mostly sunny

87° 💧 None 💨 4 mph H 70%30.00 inHg

11:00 AM

Mostly sunny

89° 💧 0.001 in 💨 7 mph H 65%30.00 inHg

12:00 PM

Sunny

90° 💧 0.002 in 💨 9 mph H 63%30.00 inHg

1:00 PM

Sunny

89° 💧 0.002 in 💨 9 mph H 63%29.97 inHg

2:00 PM

Light rain

89° 💧 0.010 in 💨 10 mph H 63%29.97 inHg

3:00 PM

Light rain

89° 💧 0.005 in 💨 12 mph H 63%29.94 inHg

4:00 PM

Mostly sunny

89° 💧 0.001 in 💨 12 mph H 63%29.91 inHg

5:00 PM

Mostly sunny

88° 💧 0.002 in 💨 12 mph H 66%29.91 inHg

6:00 PM

Mostly sunny

87° 💧 0.002 in 💨 12 mph H 68%29.91 inHg

7:00 PM

Sunny

85° 💧 0.002 in 💨 11 mph H 75%29.91 inHg

Saturday

4:00 AM

Mostly clear night

79° 💧 None 💨 8 mph H 90%29.91 inHg

7:00 AM

Partly cloudy night

81° 💧 None 💨 5 mph H 88%29.91 inHg

10:00 AM

Overcast

86° 💧 None 💨 10 mph H 74%29.97 inHg

1:00 PM

Overcast

88° 💧 None 💨 11 mph H 68%29.94 inHg

4:00 PM

Partly cloudy

87° 💧 None 💨 13 mph H 70%29.88 inHg

7:00 PM

Partly cloudy

84° 💧 None 💨 13 mph H 77%29.88 inHg

10:00 PM

Overcast night

84° 💧 None 💨 10 mph H 79%29.91 inHg

Sunday

1:00 AM

Overcast night

84° 💧 None 💨 9 mph H 79%29.94 inHg

4:00 AM

Mostly clear night

82° 💧 None 💨 7 mph H 85%29.88 inHg

7:00 AM

Overcast night

80° 💧 None 💨 4 mph H 91%29.91 inHg

10:00 AM

Mostly cloudy

86° 💧 None 💨 6 mph H 72%29.91 inHg

1:00 PM

Light rain

89° 💧 None 💨 10 mph H 66%29.91 inHg

4:00 PM

Light rain

88° 💧 None 💨 11 mph H 68%29.83 inHg

7:00 PM

Mostly cloudy

85° 💧 None 💨 11 mph H 75%29.83 inHg

10:00 PM

Mostly cloudy night

84° 💧 None 💨 9 mph H 79%29.85 inHg

Monday

1:00 AM

Overcast night

83° 💧 None 💨 8 mph H 82%29.85 inHg

4:00 AM

Mostly clear night

82° 💧 None 💨 5 mph H 87%29.83 inHg

7:00 AM

Clear night

81° 💧 None 💨 4 mph H 87%29.83 inHg

10:00 AM

Light rain

87° 💧 None 💨 5 mph H 70%29.85 inHg

1:00 PM

Mostly sunny

90° 💧 None 💨 9 mph H 64%29.83 inHg

4:00 PM

Light rain

88° 💧 None 💨 9 mph H 70%29.77 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 10 mph H 76%29.74 inHg

10:00 PM

Mostly clear night

84° 💧 None 💨 8 mph H 79%29.77 inHg

Tuesday

1:00 AM

Partly cloudy night

84° 💧 None 💨 10 mph H 82%29.77 inHg

7:00 AM

Overcast night

84° 💧 None 💨 11 mph H 80%29.80 inHg

1:00 PM

Mostly sunny

83° 💧 None 💨 9 mph H 83%29.77 inHg

7:00 PM

Mostly cloudy

91° 💧 None 💨 18 mph H 60%29.74 inHg

Wednesday

1:00 AM

Overcast night

87° 💧 None 💨 15 mph H 70%29.68 inHg

7:00 AM

Partly cloudy night

85° 💧 None 💨 15 mph H 78%29.74 inHg

1:00 PM

Light rain

81° 💧 None 💨 10 mph H 93%29.71 inHg

7:00 PM

Mostly cloudy

84° 💧 None 💨 15 mph H 76%29.83 inHg

Thursday

1:00 AM

Clear night

82° 💧 None 💨 12 mph H 69%29.80 inHg

7:00 AM

Clear night

78° 💧 None 💨 7 mph H 72%29.85 inHg

1:00 PM

Sunny

78° 💧 None 💨 7 mph H 66%29.88 inHg

7:00 PM

Sunny

85° 💧 None 💨 12 mph H 47%29.94 inHg

Friday

1:00 AM

Clear night

80° 💧 None 💨 11 mph H 46%29.88 inHg

7:00 AM

Clear night

75° 💧 None 💨 6 mph H 68%29.97 inHg

1:00 PM

Mostly sunny

76° 💧 None 💨 8 mph H 69%29.94 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 12 mph H 49%30.00 inHg

Saturday

1:00 AM

Partly cloudy night

83° 💧 None 💨 11 mph H 50%29.94 inHg

7:00 AM

Mostly clear night

81° 💧 None 💨 5 mph H 60%29.97 inHg

1:00 PM

Mostly sunny

78° 💧 None 💨 7 mph H 74%29.97 inHg

7:00 PM

Mostly sunny

84° 💧 None 💨 11 mph H 63%30.00 inHg

Sunday

1:00 AM

Mostly clear night

83° 💧 None 💨 13 mph H 58%29.94 inHg

7:00 AM

Mostly clear night

83° 💧 None 💨 11 mph H 63%29.97 inHg

1:00 PM

Mostly sunny

82° 💧 None 💨 8 mph H 65%29.97 inHg

7:00 PM

Partly cloudy

86° 💧 None 💨 16 mph H 57%30.00 inHg

Monday

1:00 AM

Mostly cloudy night

82° 💧 None 💨 17 mph H 63%29.97 inHg

7:00 AM

Overcast night

82° 💧 None 💨 11 mph H 59%30.00 inHg

1:00 PM

Overcast

79° 💧 None 💨 10 mph H 67%30.00 inHg

7:00 PM

Overcast

85° 💧 None 💨 14 mph H 54%30.06 inHg

Tuesday

1:00 AM

Overcast night

82° 💧 None 💨 14 mph H 60%30.00 inHg

7:00 AM

Overcast night

81° 💧 None 💨 10 mph H 61%30.03 inHg

1:00 PM

Overcast

80° 💧 None 💨 6 mph H 63%30.00 inHg

7:00 PM

Overcast

88° 💧 None 💨 14 mph H 47%30.03 inHg

Wednesday

1:00 AM

Mostly cloudy night

83° 💧 None 💨 13 mph H 62%29.97 inHg

7:00 AM

Overcast night

82° 💧 None 💨 9 mph H 69%30.00 inHg

1:00 PM

Light rain

78° 💧 None 💨 11 mph H 81%30.00 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 16 mph H 60%30.00 inHg

Thursday

1:00 AM

Mostly clear night

82° 💧 None 💨 15 mph H 64%29.94 inHg

In Port Isabel and, more broadly, across the state of Texas: Clear skies this morning give way to very hot conditions as the day progresses, with temperatures climbing between 73 and 99 degrees Fahrenheit. In the afternoon, the heat will intensify, and some brief showers may develop, bringing around 0.04 inches of rain. There is a moderate chance—up to 61%—for rain during the peak hours. Winds will remain light from the southwest, generally around 5 mph, with occasional gusts reaching up to 13 mph. Overall, expect a hot and mainly dry day with a brief window for rain in the late afternoon.

15-Day Weather Outlook for Port Isabel

TomorrowTomorrow

Mostly cloudy 91°/80° 💧 None 💨 13 mph

Friday, Sep 25Fri Sep 25

Overcast 90°/78° 💧 None 💨 12 mph

Saturday, Sep 26Sat Sep 26

Overcast 88°/79° 💧 0.310 in 💨 13 mph

Sunday, Sep 27Sun Sep 27

Light rain 89°/80° 💧 0.081 in 💨 11 mph

Monday, Sep 28Mon Sep 28

Light rain 90°/81° 💧 0.153 in 💨 10 mph

Tuesday, Sep 29Tue Sep 29

Mostly cloudy 91°/83° 💧 0.065 in 💨 18 mph

Wednesday, Sep 30Wed Sep 30

Light rain 87°/81° 💧 0.372 in 💨 15 mph

Thursday, Oct 1Thu Oct 1

Sunny 85°/78° 💧 None 💨 12 mph

Friday, Oct 2Fri Oct 2

Mostly sunny 85°/75° 💧 None 💨 12 mph

Saturday, Oct 3Sat Oct 3

Mostly sunny 84°/78° 💧 0.044 in 💨 11 mph

Sunday, Oct 4Sun Oct 4

Partly cloudy 86°/82° 💧 0.017 in 💨 16 mph

Monday, Oct 5Mon Oct 5

Overcast 85°/79° 💧 0.005 in 💨 17 mph

Tuesday, Oct 6Tue Oct 6

Overcast 88°/80° 💧 None 💨 14 mph

Wednesday, Oct 7Wed Oct 7

Light rain 85°/78° 💧 0.074 in 💨 16 mph

Thursday, Oct 8Thu Oct 8

Mostly sunny 82°/82° 💧 0.001 in 💨 15 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Port Isabel

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Port Isabel

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 8:00 AM

PM2.5 Fine particles Good 1,9µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 4,8µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 48,3µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 1,9µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Port Isabel

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 9,4Very high 😊Good

Tomorrow UV 9,5Very high 🙂Fair

Friday UV 10,0Very high 🙂Fair

Saturday UV 8,8Very high 🙂Fair

Sunday UV 7,0High 🙂Fair

Monday UV 8,0Very high —Unavailable

Tuesday UV 7,0High —Unavailable

Hourly UV index today

8:00 AMUV 0,1 9:00 AMUV 0,9 10:00 AMUV 2,8 11:00 AMUV 5,4 12:00 PMUV 7,8 1:00 PMUV 9,4 2:00 PMUV 9,4 3:00 PMUV 7,9 4:00 PMUV 5,4 5:00 PMUV 2,8 6:00 PMUV 1,0 7:00 PMUV 0,1

Today's weather health advice Open today's recommendations.

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Port Isabel

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · PORT ISABEL, TEXAS

Tonight's Stargazing & Shooting Stars

Good observing conditions. Best local viewing window: 6:00 AM–7:00 AM.

79/100Best-hour score

BEST TIME TONIGHT 6:00 AM–7:00 AM Astronomical darkness: 8:41 PM–6:02 AM

☁ Cloud cover 28% Real hourly forecast for the best viewing hour.

☾ Moonlight 95% Waxing Gibbous · Moon below the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant 69° high at the best hour.

✦ Estimated visible meteors 1–3/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min66%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

ACTIVE NOW

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Port Isabel were last refreshed today at 7:58 AM. The current forecast period extends through 25/09/2026 at 5:00 AM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.