January Weather in Galveston, United States

Last updated: June 24, 2025

In January, the average temperature in Galveston, United States hovers around -2°C (29°F), with extreme minimums plummeting to -27°C (-16°F) and maximums reaching a surprising 18°C (65°F). Expect 76 mm (3.0 in) of precipitation spread over 8 days, alongside a notable average humidity of 85%.

January Temperature in Galveston

In January in Galveston, the average temperature is -2°C (29°F), with maximums reaching 18°C (65°F) and minimums dropping as low as -27°C (-16°F). Travelers should be prepared for a wide range of temperatures and dress in layers to ensure comfort during their visit.

January Weather in Galveston: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Galveston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Galveston, January typically has an average temperature of -2°C (29°F), with highs reaching up to 18°C (65°F) and lows dropping to around -27°C (-16°F).

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

January Precipitation in Galveston

In Galveston in January, the precipitation amount is 76 mm (3.0 in) spread over a duration of 8 days.

January Precipitation Trends in Galveston

The chart displays monthly precipitation patterns in Galveston, 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 Galveston, January typically receives around 76 mm (3.0 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 Galveston

In Galveston in January, humidity is 85%. With an average temperature of -2°C (29°F), this humidity feels like a chilling, damp blanket that clings to your skin, making travel uncomfortable and often prompting an urgent search for warmth and shelter.

January Average Humidity in Galveston

This chart illustrates the average monthly humidity levels in Galveston, 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 Galveston is approximately 85%, 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 Galveston

In Galveston in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Galveston, you can check the information here.

Maximum UV Index Levels in Galveston for January

The chart shows the monthly maximum UV Index (UVI) for Galveston 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 Galveston typically reaches 3, which falls under the moderate exposure category.

Data source: Galveston 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 Galveston Compares to Other Months

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

This table compares monthly weather conditions in Galveston, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	76 mm (3.0 inches)	85%	moderate
February Weather	0°C (32°F)	82 mm (3.2 inches)	85%	moderate
March Weather	5°C (42°F)	104 mm (4.1 inches)	86%	high
April Weather	11°C (51°F)	93 mm (3.7 inches)	87%	very high
May Weather	18°C (64°F)	152 mm (6.0 inches)	81%	very high
June Weather	23°C (73°F)	105 mm (4.2 inches)	82%	extreme
July Weather	24°C (76°F)	97 mm (3.8 inches)	81%	very high
August Weather	23°C (74°F)	101 mm (4.0 inches)	79%	very high
September Weather	21°C (69°F)	67 mm (2.6 inches)	78%	very high
October Weather	14°C (57°F)	105 mm (4.1 inches)	81%	high
November Weather	5°C (41°F)	79 mm (3.1 inches)	89%	moderate
December Weather	2°C (35°F)	66 mm (2.6 inches)	86%	low