May to October is Sanya's rainy season, but don't let the word scare you. Tropical thunderstorms typically roll in around 3-4pm, last 30 minutes to an hour, then vanish. All-day rain is rare. Mornings from 8am to 2pm are usually clear — schedule outdoor activities before lunch and keep the afternoon flexible for indoor options or rainy strolls.
The big perk of rainy season is price. Five-star hotels drop 50-70% off peak rates, and flights often run 30-50% discounts. June through September you can find ocean-view rooms for under 400 RMB/night. Caveat: September-October is peak typhoon season. Check 7-day forecasts before booking, and choose refundable or changeable fares.
Gear for rainy season: a lightweight raincoat beats an umbrella (winds are too strong), a waterproof phone pouch, quick-dry clothing, slip-resistant sandals. If a typhoon hits, boat trips to Wuzhizhou and West Island will suspend — pivot to indoor or sheltered spots like Nanshan Temple, Atlantis Sanya Water Park, or the Sanya International Duty-Free City.