January Weather in Swansea, United States

Last updated: June 24, 2025

The average temperature in Swansea, United States during January hovers around 1°C (33°F). Yet, prepare for a wide range of conditions: temperatures can plunge to a chilling -20°C (-5°F) or rise to a pleasant 20°C (68°F). You can expect about 80 mm (3.2 in) of precipitation over roughly 8 days, with an average humidity of 82% creating a distinct atmosphere.

January Temperature in Swansea

In January in Swansea, the average temperature is 1°C (33°F). Maximums can reach 20°C (68°F), and minimums can be as low as -20°C (-5°F). Be prepared for a wide range of temperatures when traveling to Swansea during this time.

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

The chart illustrates January temperature patterns in Swansea, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Swansea, January typically has an average temperature of 1°C (33°F), with highs reaching up to 20°C (68°F) and lows dropping to around -20°C (-5°F).

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

January Precipitation in Swansea

In Swansea in January, the total precipitation amount is 80 mm (3.2 in), occurring over a span of 8 days.

January Precipitation Trends in Swansea

The chart displays monthly precipitation patterns in Swansea, 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 Swansea, January typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 8 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Swansea

In Swansea in January humidity is 82%. With an average temperature of 1°C (33°F), this humidity feels like a biting chill that dampens your clothes and makes each breath a bit heavier, making travel uncomfortable and necessitating extra layers for warmth and protection against the moisture.

January Average Humidity in Swansea

This chart illustrates the average monthly humidity levels in Swansea, 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 Swansea is approximately 82%, 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 Swansea

In Swansea 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 Swansea, you can check the information here.

Maximum UV Index Levels in Swansea for January

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

Data source: Swansea 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 Swansea Compares to Other Months

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

This table compares monthly weather conditions in Swansea, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	1°C (33°F)	80 mm (3.2 inches)	82%	moderate
February Weather	2°C (36°F)	83 mm (3.3 inches)	80%	moderate
March Weather	9°C (48°F)	139 mm (5.5 inches)	80%	high
April Weather	13°C (56°F)	148 mm (5.8 inches)	80%	very high
May Weather	20°C (68°F)	158 mm (6.2 inches)	82%	very high
June Weather	25°C (77°F)	100 mm (4.0 inches)	83%	extreme
July Weather	27°C (80°F)	91 mm (3.6 inches)	81%	very high
August Weather	25°C (77°F)	129 mm (5.1 inches)	80%	very high
September Weather	23°C (73°F)	59 mm (2.3 inches)	76%	very high
October Weather	15°C (60°F)	107 mm (4.2 inches)	76%	high
November Weather	7°C (45°F)	77 mm (3.0 inches)	85%	moderate
December Weather	4°C (40°F)	67 mm (2.7 inches)	86%	moderate