The second heatwave of Summer 2026 is upon us, and this time Londoners are a little more prepared. The boiling hot days in May solidified one thing; somewhere to cool off is key. Thankfully, London is blessed with numerous lidos, alfresco pools and even a reservoir or two. Most offer more than just a spot to splash about, with cafes, saunas (although we advise caution in this weather, sun beds and more. Grab your cossie and take heed of the best of them.