January Weather in Port Arthur, United States

Last updated: June 24, 2025

In January, the average temperature in Port Arthur, United States hovers around 12°C (54°F). However, temperatures can fluctuate significantly, with a minimum dipping as low as -7°C (20°F) and reaching a maximum of 27°C (80°F). This month also sees an average precipitation of 98 mm (3.8 in) spread over 8 days, contributing to a humidity level of 79%, making for a refreshing but potentially damp environment.

January Temperature in Port Arthur

In January in Port Arthur, the average temperature is 12°C (54°F). Maximums can reach 27°C (80°F), and minimums can dip as low as -7°C (20°F). Be sure to pack layers for your travels, as the temperature can vary significantly throughout the day.

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

The chart illustrates January temperature patterns in Port Arthur, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Port Arthur, January typically has an average temperature of 12°C (54°F), with highs reaching up to 27°C (80°F) and lows dropping to around -7°C (20°F).

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

January Precipitation in Port Arthur

In Port Arthur in January, the precipitation amount is 98 mm (3.8 in) during a span of 8 days.

January Precipitation Trends in Port Arthur

The chart displays monthly precipitation patterns in Port Arthur, 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 Arthur, January typically receives around 98 mm (3.8 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 Arthur

In Port Arthur in January, humidity is 79%. With an average temperature of 12°C (54°F), this humidity makes traveling feel quite muggy, leading to a sticky discomfort that can sap your energy and make outdoor activities less enjoyable.

January Average Humidity in Port Arthur

This chart illustrates the average monthly humidity levels in Port Arthur, 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 Arthur is approximately 79%, 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 Arthur

In Port Arthur in January, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Port Arthur.

Maximum UV Index Levels in Port Arthur for January

The chart shows the monthly maximum UV Index (UVI) for Port Arthur 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 Arthur typically reaches 5, which falls under the moderate exposure category.

Data source: Port Arthur 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 Arthur Compares to Other Months

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

This table compares monthly weather conditions in Port Arthur, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	12°C (54°F)	98 mm (3.8 inches)	79%	moderate
February Weather	14°C (58°F)	90 mm (3.5 inches)	80%	very high
March Weather	18°C (65°F)	76 mm (3.0 inches)	78%	very high
April Weather	21°C (69°F)	125 mm (4.9 inches)	81%	extreme
May Weather	25°C (77°F)	189 mm (7.4 inches)	79%	extreme
June Weather	27°C (82°F)	181 mm (7.1 inches)	75%	extreme
July Weather	28°C (83°F)	153 mm (6.0 inches)	74%	extreme
August Weather	28°C (83°F)	228 mm (9.0 inches)	73%	extreme
September Weather	27°C (80°F)	202 mm (8.0 inches)	75%	very high
October Weather	22°C (73°F)	143 mm (5.6 inches)	75%	very high
November Weather	16°C (62°F)	74 mm (2.9 inches)	79%	high
December Weather	14°C (58°F)	140 mm (5.5 inches)	83%	moderate