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You'll find Rennes to be at its warmest and driest in June, July and August. This is the perfect time for ambling around the medieval quarter and admiring its colourful half-timbered houses. It's also when you'll find music and dance shows in Thabor Park every Sunday evening, as well as the marvelous Les Tombées de la Nuit art festival in July.
September is a fantastic time to fly into Rennes as the weather will still be fairly warm and dry but you'll be more likely to get good deals on hotels and flights as the majority of tourists will have departed the city. You won't have to worry about it being too quiet either. As a university city, Rennes has a lively buzz throughout the academic year.