it did go over 30° the last time i was there. but tbf also that’s the hottest it gets

40C in London in 2022, 37.7C last month (June 2026)

…gov.uk/…/june-2026-heatwave-a-recap-of-the-tempe…

Anything over 28C is currently classified as a heatwave, but I think they’re going to have to revisit that, or just say “all summer is a heatwave try not to die” given 32-35C has been consistently hit pretty much every summer this decade.