Climate and monthly weather forecast
Port Isabel, TX

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Weather in January

January, like December, in Port Isabel, Texas, is another refreshing winter month, with an average temperature fluctuating between 59.5°F (15.3°C) and 67.1°F (19.5°C). In Port Isabel, January is the coldest month, with temperatures averaging a high of 67.1°F (19.5°C) and a low of 59.5°F (15.3°C). Weather in January »

Weather in February

The last month of the winter, February, is a pleasant month in Port Isabel, Texas, with an average temperature fluctuating between 69.4°F (20.8°C) and 62.2°F (16.8°C). The transition from January to February brings an average high-temperature of an agreeable 69.4°F (20.8°C), barely different from January's 67.1°F (19.5°C). Weather in February »

Weather in March

March, the first month of the spring in Port Isabel, is also an agreeable month, with an average temperature varying between 66°F (18.9°C) and 73°F (22.8°C). In March, the average high-temperature registers at a still pleasant 73°F (22.8°C), nearly identical to February's 69.4°F (20.8°C). Weather in March »

Weather in April

April is a warm spring month in Port Isabel, Texas, with an average temperature ranging between min 71.2°F (21.8°C) and max 77.7°F (25.4°C). The ushering in of April brings an average high-temperature of a moderately hot 77.7°F (25.4°C), closely mirroring the 73°F (22.8°C) of March. Weather in April »

Weather in May

May, the last month of the spring in Port Isabel, is another warm month, with an average temperature fluctuating between 75.7°F (24.3°C) and 81.9°F (27.7°C). A minimal variation is noted in Port Isabel's average high-temperature at the onset of May, reaching a still warm 81.9°F (27.7°C) from April's 77.7°F (25.4°C). Weather in May »

Weather in June

June, the first month of the summer in Port Isabel, is also a moderately hot month, with temperature in the range of an average low of 80.1°F (26.7°C) and an average high of 85.8°F (29.9°C). With the onset of June, the average high-temperature registers at a still warm 85.8°F (29.9°C), subtly different from May's 81.9°F (27.7°C). Weather in June »

Weather in July

July is a hot summer month in Port Isabel, Texas, with temperature in the range of an average high of 86.9°F (30.5°C) and an average low of 81.1°F (27.3°C). The onset of July notes an average high-temperature of a hot 86.9°F (30.5°C), subtly shifted from June's 85.8°F (29.9°C). Weather in July »

Weather in August

August, the last month of the summer in Port Isabel, is another hot month, with an average temperature fluctuating between 82°F (27.8°C) and 88°F (31.1°C). Port Isabel, Texas, experiences its highest average temperatures in August, reaching a peak of 88°F (31.1°C) and a minimum of 82°F (27.8°C). In August, the heat index is evaluated at a sweltering 102.2°F (39°C). Weather in August »

Weather in September

The first month of the autumn, September, is also a hot month in Port Isabel, Texas, with an average temperature fluctuating between 86.2°F (30.1°C) and 80.4°F (26.9°C). The beginning of September records an average high-temperature of a still hot 86.2°F (30.1°C), almost echoing the conditions of the previous month. Weather in September »

Weather in October

October, the same as September, is another warm autumn month in Port Isabel, Texas, with an average temperature varying between 81.9°F (27.7°C) and 76.1°F (24.5°C). The shift from September to October is characterized by an average high-temperature of a moderately hot 81.9°F (27.7°C), not significantly different from the 86.2°F (30.1°C) of September. Weather in October »

Weather in November

November, the last month of the autumn in Port Isabel, is also a moderately hot month, with an average temperature ranging between max 74.7°F (23.7°C) and min 68.4°F (20.2°C). With the beginning of November, the average high-temperature shows a small decrease, transitioning from a moderately hot 81.9°F (27.7°C) in October to a still warm 74.7°F (23.7°C). Weather in November »

Weather in December

The first month of the winter, December, is still a pleasant month in Port Isabel, Texas, with an average temperature fluctuating between 63°F (17.2°C) and 69.6°F (20.9°C). The average high-temperature for December is an agreeable 69.6°F (20.9°C), closely aligning with the temperature of the preceding month. Weather in December »
Updated: Feb 14, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What time of the year is the coldest in Port Isabel?

January proves to be the coldest month, recording an average maximum temperature of 67.1°F (19.5°C) and a minimum temperature of 59.5°F (15.3°C).

How many days does it rain in Port Isabel?

In Port Isabel, Texas, during the entire year, the rain falls for 143.2 days and collects up to 21.38" (543mm) of precipitation.

What is the month with the lowest UV index in Port Isabel?

January, February and December, with an average maximum UV index of 5, are months with the lowest UV index.

What month is the ocean coldest in Port Isabel?

The month with the coldest seawater in Port Isabel, Texas, is February, with an average ocean temperature of 66.7°F (19.3°C).

When is Daylight Saving Time (DST) in Port Isabel?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Port Isabel, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

What is the driest month in Port Isabel?

The month with the least rainfall is April, when the rain falls for 8.8 days and typically collects 0.51" (13mm) of precipitation.

What are the months with the highest UV index in Port Isabel?

The months with the highest UV index in Port Isabel are April through September, with an average maximum UV index of 7.

What is the most humid month in Port Isabel?

With an average relative humidity of 80%, May is the most humid month in Port Isabel, Texas.

When are the longest days in Port Isabel?

June has the longest days of the year in Port Isabel, with an average of 13h and 42min of daylight.

What month has the most sunshine in Port Isabel?

July has the most sunshine of the year in Port Isabel, Texas, with an average of 11.3h of sunshine.

What time of the year is the hottest in Port Isabel?

In Port Isabel, August registers the highest temperatures, averaging 88°F (31.1°C) at the peak and 82°F (27.8°C) at the lowest.

What is the month with the warmest ocean in Port Isabel?

The month with the warmest seawater is August, with an average ocean temperature of 85.1°F (29.5°C).

What is the rainiest month in Port Isabel?

September is the month with the most rainfall in Port Isabel. Rain falls for 19.8 days and accumulates 4.13" (105mm) of precipitation.

What is the least humid month in Port Isabel?

October is the least humid month, with an average relative humidity of 72%.

What is the month with the shortest days in Port Isabel?

December has the shortest days of the year, with an average of 10h and 30min of daylight.

What is the month with the least sunshine in Port Isabel?

With an average of 4.8h of sunshine, December has the least sunshine of the year.

Average temperature
Port Isabel, TX

Average temperature - Port Isabel, TX

The warmest month (with the highest average high temperature) is August (88°F).
The month with the lowest average high temperature is January (67.1°F).

The month with the highest average low temperature is August (82°F).
The coldest month (with the lowest average low temperature) is January (59.5°F).

Average pressure
Port Isabel, TX

Average pressure - Port Isabel, TX

The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are May and June (29.88"Hg).

Average wind speed
Port Isabel, TX

Average wind speed - Port Isabel, TX

The windiest month (with the highest average wind speed) is April (14.2mph).
The calmest month (with the lowest average wind speed) is September (10.9mph).

Average humidity
Port Isabel, TX

Average humidity - Port Isabel, TX

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (72%).

Average rainfall
Port Isabel, TX

Average rainfall - Port Isabel, TX

The wettest month (with the highest rainfall) is September (4.13").
The driest month (with the least rainfall) is April (0.51").

Average rainfall days
Port Isabel, TX

Average rainfall days - Port Isabel, TX

The month with the highest number of rainy days is September (19.8 days).
The month with the least rainy days is March (8.2 days).

Average sea temperature
Port Isabel, TX

Average sea temperature - Port Isabel, TX

The best month for swimming (with the highest average sea temperature) is August (85.1°F).
The coldest month (with the lowest average sea temperature) is February (66.7°F).

Average daylight / Average sunshine
Port Isabel, TX

Average daylight / Average sunshine - Port Isabel, TX

The month with the longest days is June (Average daylight: 13h and 42min).
The month with the shortest days is December (Average daylight: 10h and 30min).

The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 48min).

Average sunshine days
Port Isabel, TX

Average sunshine days - Port Isabel, TX

The month with the most sunshine days is March (20.7 days).
The month with the least sunshine days is September (7.2 days).

Average UV index
Port Isabel, TX

Average UV index - Port Isabel, TX

The months with the highest UV index are April, May, June, July, August and September (UV index 7).
The months with the lowest UV index are January, February and December (UV index 5).

Average visibility
Port Isabel, TX

Average visibility - Port Isabel, TX

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

Port Isabel, Texas, USA

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