After warm week, today could break record set in 1945 By Christopher England, Sky News meteorologist It's been getting steadily warmer this week, with successive days each bringing the UK's highest temperature of the year to date - 24.5C at London's St James's Park on Monday, 24.9C at Ross-on-Wye and Trawsgoed on Tuesday, and 26.7C at Wisley yesterday. The constituent nations recorded their individual maximum yesterday as well, with 26.7C at Wisley in England, 25.8C at Trawsgoed in Wales, 24.4C at Aboyne in Scotland, and 24.1C at Castlederg and Derrylin in Northern Ireland. It looks like today will be warmer still, with 29C quite likely in the South East. There's a small chance that 30C could be reached somewhere in that region. This would be the earliest in the calendar year that temperatures have been that high on record (the previous earliest date was 12 May 1945). May temperatures have only exceeded 30C eight times since records began, mostly near the end of the month. Although very warm, it's unlikely that official heatwave criteria will be met, while temperatures will decline over the weekend, as an increasingly northerly flow sets in. That will likely lead to widely below average temperatures on Bank Holiday Monday.