Parts of Wales could to be hit by two heatwaves this week, with the third heatwave of the year underway and a fourth possible at the weekend.
A high of 33C is forecast for Tuesday, with some of the hotspots likely to be in Monmouthshire.
Thursday is likely to be somewhat cooler and will end the current heatwave, but temperatures will rise again into the weekend, Wales weather presenter Sabrina Lee said.
“To experience 33C in August in Wales is actually pretty unusual. We have some data that goes back to 1930, and since then we’ve only had highs of 33C during five August months,” she said.
Those highs were recorded in 1990, 1995, 2003, 2020 and 2022, she added.
“With climate change we expect hotter and drier summers, and for heatwaves to become more frequent.”
The hot weather has also prompted the RNLI to warn coastal visitors to keep safe.
“With the large tides and sunny weather forecast this week, we are reminding people to always check the tide times and take a means of calling for help – such as a fully-charged mobile phone,” the lifesaving charity said.
“If you are planning on entering the water, we’d always recommend choosing a lifeguarded beach and swimming between the red and yellow flags.”
The warning came after a recent rescue by the Porthcawl RNLI volunteer lifeboat crew in Bridgend who saved two teenagers stranded on a rock with a rapidly rising tide.
“We have one of the biggest tidal ranges in the world and it’s easy to get caught out, especially if you are not familiar with the area.
“Check the tide times on a trusted source like the Met Office and remember there may be local differences depending on where you are and what tide table you are reading,” Porthcawl lifeboat crew member Chris Page said.
