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May Weather in Port Isabel, United States

Last updated: June 24, 2025

In Port Isabel, United States, the average temperature in May hovers around 26°C (79°F). Temperatures can range from a minimum of 22°C (71°F) to a maximum of 29°C (84°F). Expect 68 mm (2.7 in) of precipitation spread over 7 days, with an average humidity level of 83%.

May Temperature in Port Isabel

In May in Port Isabel, the average temperature is 26°C (79°F), with maximums reaching up to 29°C (84°F) and minimums dipping as low as 22°C (71°F). This pleasant climate makes Port Isabel an ideal destination for travelers seeking comfortable weather.

May Weather in Port Isabel: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Port Isabel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Isabel, May typically has an average temperature of 26°C (79°F), with highs reaching up to 29°C (84°F) and lows dropping to around 22°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec646469747982828382797267
Data source: Temperature data for Port Isabel generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Port Isabel

In Port Isabel in May, the precipitation amount is 68 mm (2.7 in) over the course of 7 days.

May Precipitation Trends in Port Isabel

The chart displays monthly precipitation patterns in Port Isabel, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Port Isabel, May typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec47364226688712532136947143
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Port Isabel

In Port Isabel in May, humidity is 83%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making travel an exercise in endurance as the air clings to your skin and saps your energy.

May Average Humidity in Port Isabel

This chart illustrates the average monthly humidity levels in Port Isabel, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Port Isabel is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%82%81%85%83%79%79%78%77%76%79%79%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Port Isabel

In Port Isabel in May, the maximum UV index is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. For detailed information, you can check the Hourly UV Index in Port Isabel.

Maximum UV Index Levels in Port Isabel for May

The chart shows the monthly maximum UV Index (UVI) for Port Isabel in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Port Isabel typically reaches 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69101112121212111076
Data source: Port Isabel May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Port Isabel Compares to Other Months

Weather in Port Isabel varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Port Isabel, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Port Isabel, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather18°C (64°F)47 mm (1.9 inches)78%high
February Weather18°C (65°F)36 mm (1.4 inches)81%very high
March Weather20°C (69°F)42 mm (1.6 inches)81%very high
April Weather23°C (74°F)26 mm (1.0 inches)85%extreme
May Weather26°C (79°F)68 mm (2.7 inches)83%extreme
June Weather28°C (82°F)87 mm (3.4 inches)79%extreme
July Weather28°C (83°F)125 mm (4.9 inches)79%extreme
August Weather29°C (84°F)32 mm (1.2 inches)77%extreme
September Weather28°C (82°F)136 mm (5.3 inches)77%extreme
October Weather26°C (79°F)94 mm (3.7 inches)76%very high
November Weather22°C (72°F)71 mm (2.8 inches)79%high
December Weather19°C (67°F)43 mm (1.7 inches)79%high

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