Sanya (Hainan) weather in October
October in Sanya: hot, soaked, with clean air — fine if you can take 18 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#10 of 12 months in Sanya · #1013 of 1413 destinations to visit in October · comfort 66/100 (tier C)
- Days
- 27°C
- Nights
- 21°C
- Wet days
- 18
- Sun
- 8.7 h
- Humidity
- 82%
- Daylight
- 12 h
Traveller notes on Sanya in October
Other months in Sanya
Forum posters describe the first half of September in Sanya as genuinely stuffy - high humidity, little wind unless a typhoon is nearby, and rain most nights - while mid-September onward is generally rated as fully fine, with sunnier days and just occasional rain or thunderstorms. Posters are consistent that September sits within Hainan's official wet season (June through October), with real typhoon risk that increases the later into the season a visit falls. Posters specifically recommend late September and October, alongside April and early May, as the best overall windows, given the improving weather and easing typhoon risk as the month progresses. Posters generally rate September as a mixed month for Sanya - genuinely humid and typhoon-prone early on, meaningfully better by the back half.
Forum posters call March genuinely nice - already warm but not yet properly hot, with temperatures generally in the 25-32C range and around 30C reported by month's end. Rain is possible on occasion but not a constant feature, so posters recommend packing rain gear as a precaution rather than an expectation. March sits within Sanya's October-to-March peak season, meaning good weather comes paired with higher hotel, flight and cruise prices than the shoulder months. Posters describe swimming as comfortable essentially year-round here (sea temperatures rarely drop far below 25C even in the cooler months), making March a strong pick for beach time without the year's hottest, most humid stretch.
Add your own note from Sanya's card on the map.
Sanya climate normals — October
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Sanya in October
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdsNational Day Golden Week, National Day Golden Week in China, school holidays in 2 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Sanya's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherSanya's weather peaks February–April, best around March.
October coincides with Typhoon season.
Best weatherFair weatherToughest weather
What's on in Sanya in October
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Wet half of the year
15 May – 31 Oct · usuallyMonsoonHainan's rain is concentrated in the warm months and gets heavier towards the end of them, September and October being the wettest. It is also when the island is cheap and half-empty.
- Hazard
Typhoon season
15 Jul – 31 Oct · usuallyClosuresHainan takes direct hits rather than glancing ones, and the island shuts properly when a warning is up: flights grounded, boats in, resorts moving guests off the beachfront. Source ↗
- Holiday
National Day Golden Week
1–7 OctCrowdedBook earlyA second peak inside the wet season. The weather is the year's least reliable and the prices are close to February's, which is the worst trade the Chinese calendar offers. Source ↗
Nearby, and something's on
Within 300 km of Sanya — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Sanya?
Sanya in October — FAQ
- Is October a good time to visit Sanya?
- October in Sanya: hot, soaked, with clean air — fine if you can take 18 rainy days. It ranks #10 of 12 months for Sanya on SeasonMap's comfort score (66/100).
- What is the weather like in Sanya in October?
- In October, Sanya averages a daily high of 26.9°C and a low of 21.4°C, with about 256.4 mm of rain over roughly 18.2 rainy days.
- What is the air quality in Sanya in October?
- Sanya has a mean US Air Quality Index of about 47 in October.
Within 300 km: Hội An's Full moon lantern night on 1 Jan – 31 Dec, and Da Nang's Central coast rain season around 1 Sep – 15 Dec.