Paris is the most planned-around city in Europe and still the one most people plan badly. Everything is close, so it is tempting to improvise — and then you spend a morning crossing the city twice because two things you wanted were in opposite arrondissements.
Three days covers the obvious Paris and will feel rushed. Five is where the city stops being a list of monuments and starts being a place you walked around — which is the actual reason to come.
The constraint is rarely distance. It is that the major sites now run on timed entry, and a day built without checking those slots first will collapse around a single 14:00 ticket you cannot move.
The arrondissements spiral out from the centre, which sounds neat and is genuinely useful: low numbers are central, and neighbouring numbers are usually walkable from each other. Plan by number and you will rarely cross the city twice.
Paris does not have a bad season so much as a set of trade-offs. The useful question is not *when is the weather best* but *what am I willing to queue for*.
The best balance of the year
Long days, gardens at their best, and the city still working normally. Late June starts to fill up, but the terraces are open and you get light until late in the evening.
Quieter, and the city is back at work
The summer crowds are gone, everything that closed in August has reopened, and the light is good. October brings more rain but the queues drop noticeably.
Cheap and empty, with a weather gamble
Fewer people and better prices, but you are betting on the sky. These work well if your plan can move indoor days around — which is precisely what an itinerary that reorders itself is for.
Peak crowds, and half the city is away
The heat is manageable but the queues are not, and a genuine Parisian tradition is closing for August: independent restaurants, small shops and neighbourhood bakeries shut for weeks. Museums stay open; the places locals actually go often do not.
Short days, good atmosphere
Daylight is short enough to cut your sightseeing in half, but the city looks its best and the museums are calm. A good choice if the trip is about food and indoors rather than walking.
Three days in Paris is inside the free version: one destination, up to three days, no account. Longer trips and day trips out to Versailles or Giverny are Premium.
