The rainy season on Nicaragua's Caribbean coast is from May to September, and rains are often heavy enough to produce enough freshwater runoff to adversely effect mangrove swamps and even farmland as well. This area of Nicaragua receives the most rainfall in all of Central America. From October to April, it's relatively dry but a little cooler. September, October and November, although relatively dry, do occasionally see a good drenching from a passing hurricane. People on the Mosquito Coast still vividly remember Hurrican Felix, a category five monster that ripped the area apart in 2007. Fear of hurricanes should not cause you to reschedule your trip, but if you're there and hear that one is coming, you may want to head for higher ground.