We're off to Charleville-Mezieres this Sat for 8 days. Last few weeks have been high 20's but not when we are going, some websites have a week of rain haha.
Five hours from Calais? Dryer weather?
Have thought about Auxerre, Epinal...Germany looks worse than France.
Cheers
Don't forget to leave a review of the French and other European campsites you have visited!
Auxerre and northern burgundy looks dry for next week according to Meteo France. Not overly hot (low/mid 20`s), but mainly sunny.
There are lots of decent sites in that area.