April Weather in Swansea, United States

Last updated: June 24, 2025

In April, the average temperature in Swansea, United States is a cool 9°C (49°F). Be prepared for a range of temperatures, as it can dip as low as -3°C (27°F) and rise to a warm 28°C (82°F). Expect 123 mm (4.9 in) of precipitation spread over 12 days, paired with a relatively high average humidity of 79%.

April Temperature in Swansea

In April in Swansea, the average temperature is 9°C (49°F). The maximum can reach up to 28°C (82°F), while the minimum can drop as low as -3°C (27°F). Pack accordingly to enjoy a range of weather conditions during your travels.

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

The chart illustrates April 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, April typically has an average temperature of 9°C (49°F), with highs reaching up to 28°C (82°F) and lows dropping to around -3°C (27°F).

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

April Precipitation in Swansea

In Swansea in April, the precipitation amount is 123 mm (4.9 in) over the course of 12 days.

April Precipitation Trends in Swansea

The chart displays monthly precipitation patterns in Swansea, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Swansea, April typically receives around 123 mm (4.9 inches) of precipitation spread over approximately 12 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Swansea

In Swansea in April humidity is 79%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making it essential to dress in layers and carrying a light raincoat for a comfortable travel experience.

April Average Humidity in Swansea

This chart illustrates the average monthly humidity levels in Swansea, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Swansea is approximately 79%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Swansea

In Swansea in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Swansea.

Maximum UV Index Levels in Swansea for April

The chart shows the monthly maximum UV Index (UVI) for Swansea in April, 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 April, the maximum UV index in Swansea typically reaches 8, which falls under the very high exposure category.

Data source: Swansea April 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 April 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 April’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 April’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