Grenada has a tropical climate moderated by trade winds, with temperatures hovering around 28–30°C year-round. The main variable is rain, not temperature.
Dry season (December to May) is the most popular time to visit. January through April offers the least rainfall, the most reliable sunshine, and the best conditions for hiking and diving. It is also peak season, which means higher prices and more cruise ship traffic. Book flights and accommodation in advance if you are travelling at Christmas or in February.
Shoulder season (November, May–June) brings some short tropical showers but often alternating with full sunshine. Crowds are thinner, prices are lower, and the island is noticeably more relaxed. This is an underrated time to visit.
Wet season (June to November) coincides with the Atlantic hurricane season. Grenada sits far enough south that it mostly escapes direct hurricane hits — though Hurricane Ivan caused severe damage in 2004 and Emily struck in 2005, both exceptions to the historical pattern. September and October see the heaviest rainfall. The upside: very few tourists, excellent deals on accommodation, and the island is at its greenest. Late July to mid-August is also when Spicemas Carnival takes place, which draws a good crowd despite the wet season timing.
The Grenada Chocolate Festival runs in late May and draws food enthusiasts from abroad; it is worth planning around if you have flexibility.