This warm weather coincided with the spring equinox, marking the first day of astronomical spring.

The warm conditions are attributed to a high-pressure system located to the east of the UK, which has been drawing warmer air into the region.

On March 19, 2025, most regions in the UK experienced pleasant temperatures ranging from 12C to 15C, coinciding with the arrival of spring.

The warm weather also signaled the start of birch pollen season, which is expected to be particularly high this year, affecting allergy sufferers.

Despite the pleasant conditions, forecasters warn that unsettled weather is on the horizon, with rain and strong winds expected to begin around March 23.

A major storm front is anticipated to sweep across the UK on March 28, bringing heavy rain and potential snowfall in southern Scotland.

On this day, the highest recorded temperature reached 18C in St James' Park, central London.

Many took advantage of the warm weather, with beachgoers in Brighton playing volleyball and others enjoying activities like swimming and punting.

However, the warm spell has raised air pollution levels, prompting London Mayor Sadiq Khan to issue a high air pollution alert and advise residents, especially those with asthma, to take precautions.

Following the warm period, a return to colder temperatures and possible snow is predicted around March 25.

While a cold night was recorded with temperatures dropping to -8.3C in Braemar, Aberdeenshire, warmer air is expected to flow in from the south.

Meteorologists caution that the warm weather will be temporary, with a significant drop in temperatures forecasted shortly after.