My co-worker from St. John's says the best time of year there is late August, early September. I've been in late June (wet and chilly) and late August (awesome sunny warm weather).
Maybe you should see if you can come for the Soiree? I don't know what the date for that is but its a heck of a shindig....
'01 Suzuki DR650 (Patsy Q), '11 VW Golf TDI Wagon
"It's a jet-pack, Michael. What could possibly go wrong?" Gob Bluth in Arrested Development, season 3, episode 7.