April weather - Spring 2025 - London, United Kingdom

April brings a definitive arrival of spring, characterized by increased temperatures and considerable daylight hours. It's a marked departure from March's lingering aspects of winter. In contrast to the anticipated warmth of May, April holds a balanced climate, not too cold nor too warm. The chances of rainfall increase, adding to the fresh feeling synonymous with spring. The longstanding winter conditions dissipate completely in April, with the year’s lowest snowfall average of 1mm (0.04").

Temperature

The beginning of April in London signals a minor rise in the average high-temperature, moving from a cool 10.6°C (51.1°F) in March to a moderate 14.3°C (57.7°F). During the month of April, an average temperature of 5.5°C (41.9°F) is noted during the nights.

Humidity

In London, the average relative humidity in April is 76%.

Rainfall

The month with the least rainfall is April, when the rain falls for 13.1 days and typically collects 22mm (0.87") of precipitation.

Snowfall

Months with snowfall are January through April, November and December. April is the last month it regularly snows. During 0.3 snowfall days, in April, London aggregates 1mm (0.04") of snow. Throughout the year, there are 7.7 snowfall days, and 50mm (1.97") of snow is accumulated.

Daylight

In London, the average length of the day in April is 13h and 54min.
On the first day of April, sunrise is at 6:34 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:22 pm BST.

Sunshine

In April, the average sunshine is 7.6h.

UV index

In April, the average daily maximum UV index in London, United Kingdom, is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In April, a regular UV index of 3 translates into these guidelines:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. To avoid the Sun's strongest rays, limit exposure around the mid-day period. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.