We have been in September and weather still great.
Just got back from a week in St Remy (closer to Aix), stunning town if you get the chance to visit. The weekly market on Wednesday is amazing (go early) got some great stuff, aside from just the usual fruit, veg etc. Lots of gorgeous little shops and had some great cafes/restaurants.
Les Baux is a town in the mountains (think windy roads with stunning views) about 15 mins away who have an amazing art show in an underground quarry called "Carriers de Lumieres" (spelling ?). It was all about the artist "Marc Chegal" so basically they project his artwork onto the ceiling, walls and floor and it's set to music. Then they did Alice in Wonderland as well for about 5 mins not too sure of the connection. It was fab and took about 45 mins, you can just wander round. It gets busy so go early or late as we did, went at 6.30pm and not crowded at all.
There is also a park of sorts with sculptures as well for free you can wander around or you can walk up to the town (easy 5 min walk), see all the shops etc (bit touristy this part) but there is a castle ruin great views.
Sorry can't help with much else we were really lazy as kids wanted to stay by the pool as it was so hot..
Have been to Avignon and Arles both worth a visit but that was 20 years ago.
I would go back tomorrow. 🐨