UK experiences record temperatures surpassing 20C on spring equinox
- The UK experienced its warmest day of 2025 on March 20, with temperatures exceeding 20C in several locations.
- Numerous areas reported temperatures above 20C, enabling a stark contrast with much of Europe.
- The pleasant weather came with pollution warnings and a call for vigilance for those allergic to birch pollen.
On March 20, 2025, the United Kingdom marked its warmest day of the year to date, coinciding with the spring equinox. Temperatures soared to 20.6C in Northolt, west London, surpassing the previous high of 19.7C observed on March 9, 2025, in Crosby, Merseyside. The arrival of spring brought clear skies, sunny weather, and rising mercury levels, indicating a positive shift from winter's chill. As the country enjoyed this beautiful weather, certain regions experienced particularly high temperatures, with parts of the UK even warmer than popular Mediterranean cities. The Met Office reported that numerous locations including Cardiff, Heathrow Airport, and St James's Park in London documented temperatures above 20C. The weather phenomenon resulted from a high-pressure system drawing warm air into the region, providing ideal conditions for the seasonal change. Some places might even reach highs of 22C during the day, making it a standout moment for spring in the UK. While the warm weather provided a pleasant respite, it also brought along warnings regarding air quality. A high pollution alert was issued for London due to increased particulate pollutants from mainland Europe. This prompted officials, such as London mayor Sir Sadiq Khan, to advise residents, especially those with respiratory conditions, to take precautions. The pollen season's early arrival posed challenges for those allergic to birch pollen, given last year’s favorable conditions for its growth. Moving forward, the forecasts indicated that the splendid weather might not last. As the weekend approached, an anticipated weather shift suggested rain and cloud cover would increase, likely lowering temperatures. Despite this potential dip in temperature, the Met Office noted that the weekend could still bring relatively mild conditions compared to typical early spring temperatures. With varying weather conditions expected, the focus now shifts towards how this early surge of warmth influences everyday life, health considerations, and the environments across the UK.