This is the dry season. Rainfall is low and sunshine is plentiful
Temperature is also very nice at 27-29 degrees celsius during the day and 23-24 degrees overnight
However, this is also during peak tourism season (December-May), with lots of foreign and domestic tourists visiting the island to enjoy the dry weather, driving up the prices everywhere. But if you want to party hard, this is the best time to visit
June-November is considered the off season because it's the rainy months. But the benefit is that there are far fewer tourists here during this time.
You may also consider visiting during the shoulder times: early December and May. You'll get a good balance of sunny days and smaller crowds compared to the peak season