January Weather in Port Isabel, United States

Last updated: June 24, 2025

In January, the average temperature in Port Isabel, United States is a pleasant 18°C (64°F), with minimums dropping to 4°C (40°F) and maximums reaching up to 26°C (79°F). Expect a moderate precipitation of 47 mm (1.9 in) over the course of about 8 days, contributing to an average humidity level of 78%.

January Temperature in Port Isabel

In January in Port Isabel, the average temperature is 18°C (64°F). Maximum temperatures can reach 26°C (79°F), while minimums can drop to as low as 4°C (40°F). This mild climate makes Port Isabel an ideal destination for travelers seeking a comfortable escape during this time of year.

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

The chart illustrates January 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, January typically has an average temperature of 18°C (64°F), with highs reaching up to 26°C (79°F) and lows dropping to around 4°C (40°F).

Data source: Temperature data for Port Isabel generated using information from the Copernicus Climate Change Service.

January Precipitation in Port Isabel

In Port Isabel in January, the precipitation amount is 47 mm (1.9 in) over a span of 8 days.

January Precipitation Trends in Port Isabel

The chart displays monthly precipitation patterns in Port Isabel, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Port Isabel, January typically receives around 47 mm (1.9 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

January Humidity in Port Isabel

In Port Isabel in January, humidity is 78%. With an average temperature of 18°C (64°F), this humidity feels like a warm, thick blanket wrapping around you, making traveling feel a bit sticky and sluggish, yet the coolness of the air tempers the intensity, inviting you to explore at a leisurely pace.

January Average Humidity in Port Isabel

This chart illustrates the average monthly humidity levels in Port Isabel, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Port Isabel is approximately 78%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Port Isabel

In Port Isabel in January, 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 January

The chart shows the monthly maximum UV Index (UVI) for Port Isabel in January, 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 January, the maximum UV index in Port Isabel typically reaches 6, which falls under the high exposure category.

Data source: Port Isabel January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (64°F)	47 mm (1.9 inches)	78%	high
February Weather	18°C (65°F)	36 mm (1.4 inches)	81%	very high
March Weather	20°C (69°F)	42 mm (1.6 inches)	81%	very high
April Weather	23°C (74°F)	26 mm (1.0 inches)	85%	extreme
May Weather	26°C (79°F)	68 mm (2.7 inches)	83%	extreme
June Weather	28°C (82°F)	87 mm (3.4 inches)	79%	extreme
July Weather	28°C (83°F)	125 mm (4.9 inches)	79%	extreme
August Weather	29°C (84°F)	32 mm (1.2 inches)	77%	extreme
September Weather	28°C (82°F)	136 mm (5.3 inches)	77%	extreme
October Weather	26°C (79°F)	94 mm (3.7 inches)	76%	very high
November Weather	22°C (72°F)	71 mm (2.8 inches)	79%	high
December Weather	19°C (67°F)	43 mm (1.7 inches)	79%	high