My vote...(if you can handle the heat in August)...Grenada/Grenadines. For Grenada, until the wicked seasons of 2004/2005, they were considered outside of the Hurricane belt...then in 2 successive seaons, they were pounded by named storms hit (Ivan and Emily). Basically, after Ivan the whole island was leveled.
So, now insurance considers Grenada in the belt, and cruisers have to scurry to Trinidad to keep their storm coverage. But, before 2004/2005....it had been FORTY YEARS since the last named storm hit them.
In any case, I'd use this little statistical quirk to my advantage...as its still a cheap flight from San Juan (or if you're lucky - Miami) to go to Grenada in the off-season (now through November).
Good luck finding a charter equipped with a Gen-Set to power that A/C though. PHEW, it was 99 today in Fort Lauderdale...I cant imagine that equatorial sun right now.