We couln't visit Vaison last year althogh we stayed in Seguret. It was 50C, so hot. This year it wasn't much cooler, but close to 40C probably. The rocks are getting really hot there, but we visited still. It is better to arrive early in the morning, but we got lost after avoiding Uzes rush hour, an arrived to Vaison at around 11AM. Foun parking then walked up the hill.
The old village is very pretty.
We then had a surprisingly good meal at the local cafe, and it wasn't expensive.