Temperatures have climbed above 21C in parts of England meaning Thursday is the UK’s warmest day of the year so far.
According to the Met Office, Northolt in London and Chertsey in Surrey reached 21.3C (70.3F), exceeding the previous high of 19.7C (67.5F) set earlier in March.
Wales has also had its highest temperature of 2025 so far with 20.4C (68.7F) recorded at Gogerddan in Ceredigion – provisionally Wales’ warmest spring equinox on record.
The equinox marks the first day of astronomical spring – although weather forecasters tend to refer to meteorological spring which began on 1 March.
Moderate UV levels and high or very high concentrations of tree pollen are also forecast across many parts of the UK.