In August, most of the businesses in Paris shut down while a vast number of people take their annual holiday vacations. And in case you think that’s a grammatical error, in French one says les vacances, in the plural. So if you have a problem with that, I would tell you to take it up with them yourself, but right now most of them are unavailable at the moment.
It sounds odd, but I know several business in America that follow the same model of shutting down for a few weeks so everyone can go on holiday at the same time, negating the need for constantly changing schedules the rest of the year to adapt to everyone’s particular vacations. (Although I am awaiting the results of a medical test and it would have been nice of the doctor to let me know that he was leaving for three weeks.)
Bread bakeries, which are an integral part of French life, also close up shop for two- to four weeks. But each shop plans their vacation(s?) in conjunction with the neighboring bakeries, by law, and posts those locations on their door so you can always be assured of fresh bread no matter what neighborhood you live in.