Feeling the heat? Steer clear of the decidedly sweaty tube and head to one of these brilliantly cool places to chill out instead.
Fling yourself in a fountain
Not the Trafalgar Square ones: that kind of behaviour is frowned upon these days.
Instead, take a tip from London's cool kids and head to More London by the Scoop, Granary Square near King's Cross, or Appearing Rooms on the South Bank, and fling yourself through the water to cool off.
Dip into London's lidos
Live near one of London's awesome lidos? You're in luck. There's never been a better time to call in sick and take a dip in that unheated water.
Just mind the bloke who swims outdoors religiously, whatever the weather; yes, he's unimpressed with your very literal and obvious fair-weather attitude.
Here are London's best lidos.
Ice and a slice
Just thinking about hitting the chilled -5°C temperatures inside London's Icebar in Mayfair will soothe your sweaty head.
The walls, tables, bar and even the glasses are made of crystal clear Torne River ice from northern Sweden. Sit back and chill out.
If that change in temperature feels like it might be too much of a jolt, why not try the cooling, classy atmosphere of the Parlour Restaurant at Fortnum & Mason: create your own ice cream sundae from their range of innovative and traditional flavour ice creams.
Or go on a nostalgia trip back to childhood summer holidays with a knickerbocker glory.
Take to the ice
You might think swooshing about on ice skates is only really available at Christmas in London, but it's not. Queens Ice & Bowl in Bayswater and Alexandra Palace Ice Rink are both there all year round.
Try ice skating in summer; guaranteed to cool you down.
Take to the river
So you've already taken a Thames Clipper and been on a speedboat on the Thames.
This summer it's time to try kayaking on the Thames: a brilliant way to cool down, and get a fresh perspective on the steaming city.
Find out where else you can go boating in London
Take in some cooling culture
London's museums and galleries have to maintain strict temperatures to preserve the artefacts on display, so there's never been a better time to take in some of London's amazing free culture.
The National Gallery's mercury rests at 23°C for example, while the temperature inside the British Library will always hover between 18°C and 21°C. Blissful.
St Paul's Cathedral has another suggestion: