It's been a while since I've been there. July through September is trades, might get something in June / October to, but maybe not.
If you go book a couple of days at Batiluva, Yanuca Island and kite frigates. If you're resorting, anywhere along the coast will work - outrigger, hideaway, Warwick. I've kited around Pac Harbour a bit to.
Get onto Cormac Walkden Brown at the Beachouse. His old man owns it and he kites. Legendary backpackers and massive party spot. Very good kiting all the way down from Pacific Harbour to the Yasawaswww.fijibeachouse.com