I'm considering taking Best of Eastern France 14 days Tour in June with a few days' pre-tour in Paris. How is the crowd and temperature in June? Is it rainy in May?
I can't answer your questions authoritatively, but I do want to urge you to take this tour. It's a dandy! We visited so many places we would never have found or even thought of on our own.
Stan and I have taken over 20 Rick Steves tours, and this is one of our top 2 or 3.
You can see historical weather on the site https://www.timeanddate.com/weather/france/reims/historic Change the city to those you want to check and select the dates of interes
Count us as 2 more people who loved this tour and may do it again in the future. It’s hard to know with weather these days. It’s not usually hot in early June, but you could hit a heat wave. You could also get rain, but not usually multiple days. Our tour was in August and it was hot and and experiencing a drought, but we were never uncomfortable in the hotels.