Nice enjoys a deliciously mild climate. The Cote d'Azur has a reputation for year-round sunshine and balmy temperatures, and this is frequently proven to be true. In terms of weather we have found that any month from March through to October is usually good. July and August are usually the hottest months (and busiest), but you are pretty much guaranteed sunshine in May, June and September, without the crowds.
NICE
Month - Ave temp (C/F)
January - 11 / 52
February - 12 / 54
March - 14 / 56
April - 17 / 62
May - 20 / 69
June - 22 / 72
July - 24 / 75
August - 26 / 79
September - 25 / 77
October - 20 / 69
November - 16 / 61
December - 13 / 55