We just sailed from the USVI to Genada in 3 days on the rhumb line, arriving on April 28th, on an Island Packet 380.

Winds this time of year are E - ENE, 15-17 knots with seas 5-7 feet. It was a close reach for us and pretty uncomfortable most of the way.

In the summer, winds are typically E-ESE so you will be beating a lot more, as a rule of thumb, heading south. Tropical waves stream across every 3-4 days during that time so just allow for those nasty things.

Grenada is a good place to be on your boat, safe from hurricanes. You can base either in a marina or anchored in one of the SE Bays.

I would definitely prefer to be in Grenada for hurricane season, rather than risk losing my vessel or damaging my vessel in the BVI during hurricane season.