Chamarel and the southwest highlands have a slightly different climate to the coastal resorts. The altitude — Chamarel sits at around 300 metres — means temperatures are noticeably cooler, which is a relief in the hot months of November to April. The highlands also catch more rain than the coast: the Black River Gorges receives some of the highest rainfall on the island, and Chamarel can be overcast or misty even on days when the beaches are sunny.
May to October is the dry season and the most comfortable time to visit. Days are clear, the air is fresh, and the highland scenery is at its best. The Seven Coloured Earths are most vividly coloured in direct sunlight, and this is the best season for hiking in the Black River Gorges. Temperatures in the highlands during this period are pleasant — warm in the day, genuinely cool in the evenings.
November to April is the cyclone season. Chamarel is not directly on the coast and is less exposed than beach areas, but heavy rain, mist, and strong winds can make visiting less enjoyable. On the other hand, the Chamarel Waterfall is most impressive after rain — a full torrent rather than the modest flow of the dry season. If you are visiting in the wet season, mornings tend to be clearer than afternoons.
The main sights — Seven Coloured Earth, the waterfall, the Rhumerie — can be visited year-round. There is no specific season when they close, but the experience is considerably better in dry, clear weather.