November is Paris between seasons. The leaves come down in the Tuileries and the Luxembourg, the days shorten fast, and the autumn tour groups thin out before the Christmas crowds arrive. Expect cool, gray, often damp weather, with highs around 11°C (52°F) and rain on about ten days of the month.
What you get in exchange is a calendar worth planning around: free museum days on Sunday, November 1, Armistice Day on the 11th, Beaujolais Nouveau on the 19th, and the first Christmas lights, windows and markets in the second half of the month. Here is what to pack, what is happening when, and how to spend the gray days. If you are staying into the holidays, carry on with Paris in December.