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December Weather in Port Isabel, United States

Last updated: June 24, 2025

In December, the average temperature in Port Isabel, United States hovers around 19°C (67°F), fluctuating between a comfortable 6°C (44°F) and a pleasant 25°C (78°F). Visitors should prepare for 43 mm (1.7 in) of precipitation spread across 7 days, contributing to a notable average humidity of 79%. Enjoy the diverse climate while exploring!

December Temperature in Port Isabel

In December in Port Isabel, the average temperature is 19°C (67°F). Maximums can reach 25°C (78°F), while minimums can drop as low as 6°C (44°F). This pleasant climate makes Port Isabel an ideal destination for travelers seeking comfortable weather.

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

The chart illustrates December 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, December typically has an average temperature of 19°C (67°F), with highs reaching up to 25°C (78°F) and lows dropping to around 6°C (44°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.

December Precipitation in Port Isabel

In Port Isabel in December, the total precipitation amount is 43 mm (1.7 in) spread over a period of 7 days.

December Precipitation Trends in Port Isabel

The chart displays monthly precipitation patterns in Port Isabel, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Port Isabel, December typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec47364226688712532136947143
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Port Isabel

In Port Isabel in December, humidity is 79%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit more challenging, as the air is thick and can leave you feeling sluggish during outdoor adventures.

December Average Humidity in Port Isabel

This chart illustrates the average monthly humidity levels in Port Isabel, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Port Isabel is approximately 79%, 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 December generated using information from the Copernicus Climate Change Service.

December UV Index in Port Isabel

In Port Isabel in December, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Port Isabel, you can refer to this Hourly UV Index in Port Isabel.

Maximum UV Index Levels in Port Isabel for December

The chart shows the monthly maximum UV Index (UVI) for Port Isabel in December, 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 December, the maximum UV index in Port Isabel typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69101112121212111076
Data source: Port Isabel December 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 December 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 December’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 December’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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