Hi,
Its very good idea to visit Sikkim in June coz weather is quite nice at that time.
For accomodation or booking hotels in Sikkim visit http://www.sikkimhotravel.com
It is an authorised travel management company providing online booking for hotels, flights, car rental and tour packages to Sikkim and its various destinations. Also info about the weather conditions and other popular destinations that you can visit while visiting Sikkim.
Enjoy your trip......