Hurricanes can occur at anytime of the year. The World Weather Travelers Guide has a good article about hurricanes in the Caribbean. Should a hurricane threaten St. John, you would have plenty of warning these days so even if you are on St. John, you would have time to leave should that be necessary. What you do need to be concerned about is the cost should your vacation be delayed or interrupted! We highly recommend to all our guests the purchase of trip interruption/cancellation insurance; in the winter it may be a snow storm at home creating havoc in vacation plans, in the summer it could be the threat of an approaching hurricane, or, heaven forbid, a medical emergency to anyone at anytime!
While hurricane season stretches from June through November, September is usually the most active month around St John