Hainan in Fall
In fall (September, October and November), Hainan sees average daytime highs around 9°C and overnight lows near -1°C, with 124 mm of precipitation over about 19 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.
Over the season highs ease from about 22°C in early September to -8°C by late November. The sky is clear or mostly clear about 45% of the time across fall, and the air most often feels dry.
Fall is Hainan's 3rd-best season to visit on our travel score. For the whole year in context, see Hainan's year-round climate.
- Avg daytime high
- 9°C
- 3rd-warmest season
- Avg overnight low
- -1°C
- Precipitation
- 124 mm
- 19 wet days
- Avg wind
- 12 km/h
- Travel score
- 3.0
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Hainan in Fall
Over the season highs ease from about 22°C in early September to -8°C by late November.
A typical fall day in Hainan reaches about 9°C and drops to -1°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Hainan
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 57 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Hainan weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -15° / -26° | 4 | 1.1 | 1.6 | 8.7 | 0.0 |
| Feb | -9° / -22° | 6 | 1.6 | 1.9 | 10 | 0.0 |
| Mar | 1° / -11° | 16 | 3.6 | 3.3 | 11.6 | 0.1 |
| Apr | 12° / 0° | 33 | 5.6 | 1.2 | 13.3 | 3.2 |
| May | 20° / 8° | 62 | 9.9 | 0.1 | 14.8 | 6.2 |
| Jun | 25° / 15° | 101 | 13.3 | 0 | 15.6 | 6.1 |
| Jul | 27° / 18° | 162 | 14.7 | 0 | 15.3 | 5.8 |
| Aug | 25° / 16° | 143 | 13.6 | 0 | 14 | 6.2 |
| Sep | 20° / 8° | 73 | 9.1 | 0 | 12.4 | 6.4 |
| Oct | 10° / -0° | 37 | 6.9 | 0.9 | 10.6 | 2.7 |
| Nov | -3° / -12° | 14 | 3.2 | 2.9 | 9.1 | 0.0 |
| Dec | -13° / -23° | 8 | 2.6 | 3.4 | 8.3 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 45% of the time across fall.
Chance of precipitation in Fall
Hainan gets around 124 mm of rain and snow over 19 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 12 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 12 min in early September to 8 h 36 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 3.0 kWh/m².
Hazard calendar for Hainan
In fall, Hainan overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Hainan's rainy season runs June–September, when most of the year's rain falls.
Is fall a good time to visit Hainan?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Hainan.
What to pack for Hainan in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Hainan sees daytime highs around 9°C and nights near -1°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 19 days see rain.
UV index in Hainan in Fall
Clear-sky midday UV across fall averages around 3. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Hainan peaks around August 17 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 3 | 4 | 5 | 6 | 5 | 7 | 5 | 2 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | Moderate | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 3 | Moderate |
| Apr | 4 | Moderate |
| May | 5 | High |
| Jun | 6 | High |
| Jul | 5 | Moderate |
| Aug | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 2 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Air quality in Hainan in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Hainan is worst in March — around 37 µg/m³ PM2.5 (poor), about 2.3× the cleanest month (August, 16 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Hainan's WHO annual average of 25 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 31 | 31 | 37 | 30 | 21 | 19 | 20 | 16 | 17 | 22 | 28 | 27 |
| Level | Moderate | Moderate | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 31 | Moderate |
| Feb | 31 | Moderate |
| Mar | 37 | Poor |
| Apr | 30 | Moderate |
| May | 21 | Moderate |
| Jun | 19 | Moderate |
| Jul | 20 | Moderate |
| Aug | 16 | Moderate |
| Sep | 17 | Moderate |
| Oct | 22 | Moderate |
| Nov | 28 | Moderate |
| Dec | 27 | Moderate |
Where is Hainan?
Hainan sits at 47.2°N, 127.0°E, 0 m above sea level, in China. The nearest listed city is Harbin, 167 km away.
Topography around Hainan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Hainan.
Within 3 km, the terrain around Hainan has only modest variations in elevation — a maximum elevation change of 73 m around an average of 214 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 91 m; within 80 km, significant variations in elevation — a maximum elevation change of 538 m.
The land around Hainan is covered by cropland (87%) within 3 km, cropland (89%) within 16 km, and cropland (82%) within 80 km.
China travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / I
- 220 V · 50 Hz
- Prices
- ≈ 47% of US
- price level, 2025
- GDP per capita
- $13,862
- 2025
- Happiness
- 6.1 / 10
- World Happiness, 2025
- Homicide rate
- 0.5
- per 100k, 2020
- Road deaths
- 17.4
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Low
- EF EPI 464
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hainan (47.2322°, 126.9809°, elevation 0 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.