January Weather in Swansea, United States

Last updated: June 24, 2025

In January, the average temperature in Swansea, United States hovers around 0°C (33°F). Expect chilly days, where the minimum can plunge to -20°C (-4°F), while the maximum might reach a mild 20°C (69°F). With 74 mm (2.9 in) of precipitation spread over 8 days, one can expect a fair bit of moisture in the air, complemented by an average humidity of 84%.

January Temperature in Swansea

In January in Swansea, the average temperature is 0°C (33°F). The maximum can reach 20°C (69°F), while the minimum can drop as low as -20°C (-4°F). Travelers should be prepared for a wide range of temperatures, so layering clothing is essential.

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 0°C (33°F), with highs reaching up to 20°C (69°F) and lows dropping to around -20°C (-4°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 precipitation amount is 74 mm (2.9 in) over a period 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 74 mm (2.9 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 Swansea

In Swansea in January humidity is 84%. With average temperature 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making outdoor adventures less enjoyable and travel plans challenging.

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 84%, 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	0°C (33°F)	74 mm (2.9 inches)	84%	moderate
February Weather	1°C (35°F)	92 mm (3.6 inches)	84%	moderate
March Weather	4°C (39°F)	102 mm (4.0 inches)	82%	high
April Weather	9°C (49°F)	123 mm (4.9 inches)	79%	very high
May Weather	15°C (58°F)	101 mm (4.0 inches)	75%	very high
June Weather	20°C (68°F)	97 mm (3.8 inches)	78%	very high
July Weather	23°C (74°F)	122 mm (4.8 inches)	76%	very high
August Weather	23°C (74°F)	92 mm (3.6 inches)	76%	very high
September Weather	19°C (67°F)	97 mm (3.8 inches)	75%	very high
October Weather	14°C (57°F)	135 mm (5.3 inches)	75%	high
November Weather	7°C (45°F)	101 mm (4.0 inches)	80%	moderate
December Weather	2°C (36°F)	120 mm (4.7 inches)	80%	low