When it gets too hot to wander the streets of Milan you can spend a day in of the city’s outdoor swimming pools:

Practical tips
The outdoor swimming pools are open from the beginning of June till the end of August.
Wearing a swim cap (and obviously a swim suit) is obligatory but you can buy one for a relatively modest price at the entrance. If you haven’t brought a swim suit you can buy one at e.g. Calzedonia, Yamamay, H&M which you can find everywhere in the city., check out our shopping guide here.
Buy your tickets online before going, that way you are sure not to go and find the whole place full or maybe have to stand in direct sunlight in a queue for a long time inorder to get in
In the city
Bagni Misteriosi, 18, Via Carlo Botta (find on map), Bagni Misteriosi is now also open for evening swims Friday-Sunday 7-10 pm.
Romano,20, Via Ampére (find on map)
Argelati, 6 Via Segantinin (find on map)
Solari, 20, Via Montevideo – located inside the small Solari Park (find on map)