The best thing to do if you are in Rome in July is to go shopping. First of all there is air conditioning everywhere. Especially if you go to Zara and H&M in via del Corso, you can spend hours there in excellent climate conditions without spending too much money. July is a great month because you also start to see the new autumn collections. One good example is Max Mara in via Condotti where you can search for jackets and pants. The colours of the next season are quite easy: blue navy and black.