A mini-heatwave could start as soon as Thursday with temperatures expected to reach 27C in some parts of the nation.
Met Office says widespread sunshine will see Thursday become the hottest day of the year so far, trumping today's sizzler with 25C recorded in Porthmadog, Gwynedd.
It'll mean Thursday will mark the start of what some describe as a mini-heatwave, particularly in Wales and the Southwest of England.