September · China
Best time to visit Sanya in September Weather, crowds & prices
Weather in Sanya in September
Average temperature 27°C, 432 mm of rain, about 19 days with 6+ hours of sunshine and 87% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
5.3/10
Ranked #11 of 12 months
- Avg temp
- 27°C
- Rainfall
- 432 mm
- Humidity
- 87%
- Days with 6h+ sun
- 19
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Sanya scores 5.3/10 for beach and coastal travel - ranked #11 of 12. Expect around 27°C, 432 mm of rain, and roughly 19 days with 6+ hours of sunshine this month.
Tropical island beach paradise on Hainan Island, China's Hawaii.
September in Sanya — workable with trade-offs
September averages 27°C (80°F) and humidity near 87%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
432 mm of rain puts this in monsoon territory — about 19 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 5.3/10 here, 11th of 12 months, against 9.5/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Figure on low-season pricing, with crowds are light for this destination.
Flexible dates? March scores 4.2 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Sanya in September?
- In September, Sanya averages 27°C, 432 mm of rain, and about 19 days with 6+ hours of sunshine. Its climate-comfort score is 5.3/10.
- Is September a good time to visit Sanya?
- September earns a 5.3/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Sanya in September?
- Expect about 432 mm of rain in September. Average humidity is 87% and there are about 19 days with 6+ hours of sunshine.
Curated in Sanya
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Sanya, China. Live activities and tours from GetYourGuide, matched to this destination.