Considering Jamaica's tropical climate, the best time to visit for a sunny vacation is during the dry season, which typically runs from December to April. These months offer pleasant temperatures ranging from 78-82 degrees Fahrenheit, making them ideal for outdoor activities like hiking and exploring the island's natural beauty.
However, if you're looking for a more relaxed atmosphere and smaller crowds, consider visiting during the shoulder season, which falls in May and June or November and December. These periods still enjoy plenty of sunshine but with slightly lower temperatures.
Avoid traveling to Jamaica during the hurricane season, which runs from June to October, as it can be quite unpredictable and disrupts your plans.
In terms of beach activities, the best time for swimming and water sports is during the summer months of July to September when the sea conditions are calmest.