Should it get too hot to wander the streets of Milan you can spend a day in of the city’s outdoor swimming pools. Know that enter the water if you’re wearing a swim cap (and obviously swim suit) but you can buy one for a relatively modest price at the entrance. If you haven’t brought a swim suit at e.g. Calzedonia,Yamamay, H&M which you can find everywhernin the city. Admissions fees are around €7-10. The outdoor swimming pools are open from the beginning of June till the end of August.
All the outdoor swimming pools on the list closed on August 27th with the exception of Caimi (Bagni Misteriosi) which will remain open till September 17th.
Here are the most central ones: