Bonaire, Saint Eustatius and Saba (The Netherlands)
- Hurricane MARIA continued moving west-northwest over the Caribbean Sea, strengthening. Its center passed south of St. Croix island (US Virgin islands) early in the morning of 20 September. It then continued moving towards Puerto Rico as a category 5 hurricane, with maximum sustained winds of 270 km/h.
Hurricane MARIA-17 continued moving west-northwest, strengthening. It made landfall over Dominica island on 19 September at 1.15 UTC with maximum sustained winds of 260 km/h (category 5 hurricane).