As the Trade Winds Arrive, San Blas Enters Its Signature Season of Fresh Breezes and Crystal-Clear Waters Every year, a unique climatic rhythm transforms San Blas into one of the most pleasant—and privileged—sailing destinations in the Caribbean. This rhythm begins when the Trade Winds return. But what exactly are the Trade Winds? They are steady, gentle-to-moderate winds that blow across a narrow band of the planet known as the tropical trade-wind belt , stretching roughly