March Weather in Swansea, United States

Last updated: June 24, 2025

In March, the average temperature in Swansea, United States hovers around 4°C (39°F), with a minimum dip to -14°C (7°F) and a maximum rise to 20°C (69°F). Expect 102 mm (4.0 in) of precipitation over approximately 10 days, coupled with an average humidity of a notable 82%.

March Temperature in Swansea

In March in Swansea, the average temperature is 4°C (39°F). The maximum can reach 20°C (69°F), while the minimum can drop as low as -14°C (7°F). Be prepared for a wide range of temperatures if you're traveling to Swansea this month.

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

The chart illustrates March 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, March typically has an average temperature of 4°C (39°F), with highs reaching up to 20°C (69°F) and lows dropping to around -14°C (7°F).

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

March Precipitation in Swansea

In Swansea in March, the total precipitation amount is 102 mm (4.0 in) falling over the course of 10 days.

March Precipitation Trends in Swansea

The chart displays monthly precipitation patterns in Swansea, with values for each month alongside March’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how March’s conditions compare to those of other months. In Swansea, March typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 10 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

March Humidity in Swansea

In Swansea in March, humidity is 82%. With an average temperature of 4°C (39°F), this humidity feels like a chill that seeps into your bones, making it uncomfortable for traveling as you find yourself bundled up, yet still damp and cold.

March Average Humidity in Swansea

This chart illustrates the average monthly humidity levels in Swansea, with March’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In March, average humidity in Swansea is approximately 82%, offering insight into how humid the weather typically is during this month.

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

March UV Index in Swansea

In Swansea in March, 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 Swansea, you can refer to this Hourly UV Index in Swansea.

Maximum UV Index Levels in Swansea for March

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

Data source: Swansea March 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 March 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 March’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 March’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