The best time to visit Cannes is during the early fall when temperatures are still warm and weather is still dry but hotels are a lot cheaper. During this time, expect to pay around $165/night for an accommodation for 2. That's half of the normal price in August. Temperatures are in the mid 70s, just a bit colder than the average 80°F you could experience during peak season.
Tourism peaks in Cannes in the summer, which comes with higher hotel and rental rates. If you're on a budget, try avoiding the FIF week (May 9th - 21st), the MIPIM week (March 12th - 17th) as well as the MIPCOM week (October 15th - 21st) since accommodation rates peak the most during these times.
Be prepared for the rain if you travel to Cannes in October and November, since there are 12 days with precipitation each month on average.
Avoid the crowd
The best time to avoid the crowd in Cannes, France is January.
The cheapest time to travel to Cannes, France is November.
Approximate nightly cost for a one bedroom vacation rental.
09/11 - 09/18
10/02 - 10/07
Tax Free World
10/15 - 10/21
11/15 - 11/18
11/28 - 12/02
12/03 - 12/09
12/23 - 01/06
03/12 - 03/17
04/08 - 04/14
05/09 - 05/21
06/16 - 06/24
In Cannes, France, July is the sunniest month and July the warmest.