Well my answer is : There is no best time to come to Provence ! I love my Provence and am so happy to live here all year long I appreciate every month.
Pending on what you are looking for, here are some hints to choose YOUR best time
January & February are the quietest month of the years and when local are taking their vacations so very quiet.
March is the start of spring and the region is filled with fruits trees in blossom, iris and wil flowers popping
April correspond to the start of the season, all restaurants and hotels will be now reopened. Roses are in flowers...
May is gorgeous with longer days, wild flowers in the field (Poppies !!!), température are usually around the 80s. It is also one of the busiest month with its bank holidays week end (May 1st, May 8th, Thursday of Ascension) so loading with French and locals craving the sun.
JUNE is the month were you can see lavender blooming, start dining outside with no sweater. Temperature can be in the 90s.
JULY is lively with all kinds of festival, Lavender not harvested before the 20th, sun flower field in full bloom... Not to forget the Tour de France who is never far away.
AUGUST is the warmest month of the year and loading with families.....
SEPTEMBER Harvest time, cooler days but still in the high 80s
OCTOBER gets a bit quieter. Temperature can still be nice but uncertain. Olive harvest by mid to end of the month.
NOVEMBER & DECEMBER are obviously colder but reasonnably. A very nice time to visit as quieter and everything is still open. Christmas is a very big thing in Provence with a lot of tradition (plenty of market around).
|Poppies and Cissel early May near St Remy de Provence|
|Jasmin bush in Roussillon mid May|
|Roses bush early May in the Luberon|
|Olive tree flowers early May|
|Lavender and Iris in the background Mid May|
|Almond in St Paul de Mausole mid May|
|April in Provence Scottish broom|
|Poppies field in April|
|Wild Flowers in April|
|Busy Bee in Provence|
|Sun Flower field in Provence mid July|
|Lavender field in Roussillon early July|
|Walking in Alpilles in April|