You must try Coorg but in 1st week of June because you can enjoy picturesque views of the hill station and the freshness of the nature. The crowd will also get less by end of May. May will be hot in daytime touching 34 degrees sometimes. So it is always better to travel in June. Perfect time for honeymooners, less crowd and fresh air. Temperature will be within 29 degrees, may rain or may not but it will be a pleasant weather no doubt. Though many says monsoon is not the time for Coorg but I feel it is the ideal time to get to see the nature's beauty at its best. Cheers..