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.
Here are the most central ones:
Novotel Milan Linate organizes outdoor brunch every Sunday until September 1st from 12-2.30 pm with free access to the hotel swimming pool afterwards, It costs €20 for adults and €10 for kids.You must reserve at least 24 hours in advance at either email address firstname.lastname@example.org or phone number +3902507261. The hotel is located at 121, Via Mecenate (find on map).
You can also go to the outdoor swimming pool in Como by the lake, read more here.