April Weather in London, United States

Last updated: June 24, 2025

In April, the average temperature in London, United States hovers around 18°C (65°F). However, expect fluctuations with a minimum of 4°C (40°F) and a soaring maximum of 35°C (95°F). During this month, you'll encounter an average precipitation of 44 mm (1.7 in) spread over about 4 days, accompanied by a comfortable average humidity of 72%.

April Temperature in London

In April, in London, the average temperature is 18°C (65°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (40°F). This range makes London an ideal destination for travelers seeking a pleasant climate for outdoor activities and exploration.

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

The chart illustrates April temperature patterns in London, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In London, April typically has an average temperature of 18°C (65°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (40°F).

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

April Precipitation in London

In London in April, the precipitation amount is 44 mm (1.7 in) over the course of 4 days.

April Precipitation Trends in London

The chart displays monthly precipitation patterns in London, 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 London, April typically receives around 44 mm (1.7 inches) of precipitation spread over approximately 4 days.

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

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Millimeters (mm) Inches (in)

April Humidity in London

In London in April humidity is 72%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace, making traveling somewhat uncomfortable as the air clings to your skin and the heat can be stifling, yet it's perfect for enjoying leisurely strolls under the shade.

April Average Humidity in London

This chart illustrates the average monthly humidity levels in London, 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 London is approximately 72%, 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 London

In London in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in London.

Maximum UV Index Levels in London for April

The chart shows the monthly maximum UV Index (UVI) for London 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 London typically reaches 9, which falls under the very high exposure category.

Data source: London 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 London Compares to Other Months

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

This table compares monthly weather conditions in London, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (51°F)	92 mm (3.6 inches)	82%	moderate
February Weather	11°C (53°F)	85 mm (3.3 inches)	85%	moderate
March Weather	14°C (57°F)	112 mm (4.4 inches)	80%	very high
April Weather	18°C (65°F)	44 mm (1.7 inches)	72%	very high
May Weather	22°C (72°F)	25 mm (1.0 inches)	58%	very high
June Weather	27°C (82°F)	1 mm (0.0 inches)	49%	extreme
July Weather	31°C (88°F)	0 mm (0.0 inches)	36%	extreme
August Weather	31°C (87°F)	0 mm (0.0 inches)	30%	very high
September Weather	27°C (80°F)	2 mm (0.1 inches)	42%	very high
October Weather	20°C (68°F)	16 mm (0.6 inches)	59%	high
November Weather	14°C (58°F)	45 mm (1.8 inches)	78%	moderate
December Weather	10°C (50°F)	76 mm (3.0 inches)	79%	moderate