Though Paris in January is usually cold, with temperatures ranging from 2 to 5°C, and rainy, with half of the month having some precipitation or other, there are many things to do and see during this month.
If you are planning your trip, keep in mind that great sales start in Paris in January, this is when even well-known fashion houses lower their prices, offering brand apparel and shoes at discounts that cannot be missed.
January is also a great time to experience otherwise over-crowded museums like Louvre and Musee D’Orsay, as this is the low season and there are fewer tourists, marveling the masterpieces.