Temperatures are expected to hit 36C on Thursday, with the Met Office extending its current red extreme heat warning.Leading to the hottest June night. It is now set to end at 23:59 on Thursday night.
A yellow thunderstorm warning is also in place for a large part of Wales for the early hours of Friday.
The warning is in place between midnight and 10:00, and covers Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Powys, Rhondda Cynon Taf, Swansea, Torfaen, Vale of Glamorgan and Wrexham.
The thunderstorms may produce sudden, gusty winds of up to 60mph, with the chance of frequent lightning, hail and heavy rain.
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