Britain could roast on the record hottest May day for 176 years this week, forecasters say. The mercury is set to hit the “low 30s” as a tropical blast moves in on Friday and Saturday leaving a “chance” of smashing the 32.8C May temperature record.

That was set on on May 22, 1922 at Camden Square, London, and May 29, 1944, at Horsham, West Sussex, Tunbridge Wells, Kent, and Regent’s Park, London. Met Office forecaster Emma Sharples said: “There is a chance of a 32.8C May record temperature, with the low 30s possible on Friday and, most likely, Saturday. Tropical maritime air and a southerly feed will be across the country from late Thursday, with sunshine boosting temperatures.”

Northern England and Scotland are both due 28C while Britain will be hotter than 29C Phuket, Thailand, and 27C Mexico City. But the Met Office said showers will hit parts of the the West on Saturday and, after a dry 28C Sunday, thunderstorms threaten much of England into a 25C Bank Holiday Monday.