Sanya in Summer
In summer (June, July and August), Sanya sees average daytime highs around 29°C and overnight lows near 26°C, with 753 mm of rain over about 70 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 29°C. The sky is clear or mostly clear about 13% of the time across summer, and the air most often feels miserable.
Summer is Sanya's weakest season of the year to visit on our travel score. For the whole year in context, see Sanya's year-round climate.
- Avg daytime high
- 29°C
- warmest season of the year
- Avg overnight low
- 26°C
- Rainfall
- 753 mm
- 70 wet days
- Avg wind
- 12 km/h
- Travel score
- 3.5
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Sanya in Summer
Across summer, daytime highs hold fairly steady around 29°C.
A typical summer day in Sanya reaches about 29°C and drops to 26°C overnight. The warmest of the three months is June, the coolest August.
How summer really feels in Sanya
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Sanya weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 23° / 19° | 12 | 2.3 | 11 | 8.2 |
| Feb | 24° / 19° | 10 | 2.5 | 11.4 | 8.2 |
| Mar | 25° / 22° | 18 | 3.8 | 11.9 | 7.9 |
| Apr | 28° / 24° | 53 | 8.6 | 12.4 | 6.6 |
| May | 29° / 26° | 139 | 19 | 12.8 | 4.3 |
| Jun | 30° / 27° | 212 | 22.2 | 13.1 | 3.4 |
| Jul | 29° / 26° | 280 | 23 | 13 | 3.6 |
| Aug | 29° / 26° | 261 | 24.4 | 12.6 | 3.5 |
| Sep | 29° / 26° | 258 | 22.3 | 12.1 | 3.8 |
| Oct | 28° / 24° | 182 | 14 | 11.6 | 5.7 |
| Nov | 26° / 22° | 54 | 5.6 | 11.1 | 7.5 |
| Dec | 24° / 19° | 26 | 3 | 10.9 | 8.2 |
Cloud cover in Summer
The sky is clear or mostly clear about 13% of the time across summer.
Chance of precipitation in Summer
Sanya gets around 753 mm of rain over 70 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels miserable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 12 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 hours in early June to 12 h 24 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.3 kWh/m².
Hazard calendar for Sanya
In summer, Sanya overlaps its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.
Sanya sits in the Pacific typhoon belt; the season peaks July–October.
Sanya's monsoon runs May–October, when most of the year's rain falls.
Is summer a good time to visit Sanya?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a weaker month for outdoor sightseeing in Sanya.
What to pack for Sanya in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Sanya sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 70 days see rain.
Sea temperature near Sanya in Summer
The nearest coast averages about 29°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 19 km away) is warmest in June at about 29°C and coldest in February near 23°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 23 | 23 | 24 | 26 | 28 | 29 | 29 | 29 | 29 | 28 | 26 | 25 |
| Comfort | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 23 | Refreshing |
| Feb | 23 | Refreshing |
| Mar | 24 | Warm |
| Apr | 26 | Warm |
| May | 28 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 25 | Warm |
UV index in Sanya in Summer
Clear-sky midday UV across summer averages around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Sanya peaks around August 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 8 | 10 | 11 | 11 | 11 | 12 | 13 | 13 | 11 | 10 | 8 | 7 |
| Level | Very high | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 8 | Very high |
| Feb | 10 | Very high |
| Mar | 11 | Extreme |
| Apr | 11 | Extreme |
| May | 11 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 11 | Extreme |
| Oct | 10 | Very high |
| Nov | 8 | Very high |
| Dec | 7 | High |
Air quality in Sanya in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Sanya is worst in December — around 23 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (August, 11 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Sanya's WHO annual average of 15.5 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 20 | 19 | 17 | 15 | 11 | 12 | 11 | 11 | 11 | 18 | 18 | 23 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 20 | Moderate |
| Feb | 19 | Moderate |
| Mar | 17 | Moderate |
| Apr | 15 | Moderate |
| May | 11 | Good |
| Jun | 12 | Good |
| Jul | 11 | Good |
| Aug | 11 | Good |
| Sep | 11 | Good |
| Oct | 18 | Moderate |
| Nov | 18 | Moderate |
| Dec | 23 | Moderate |
Where is Sanya?
Sanya sits at 18.3°N, 109.5°E, 1 m above sea level, in China. The nearest listed city is An Hải, 278 km away.
Topography around Sanya
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sanya.
Within 3 km, the terrain around Sanya has only modest variations in elevation — a maximum elevation change of 203 m around an average of 24 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 610 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,775 m.
The land around Sanya is covered by trees (42%), artificial surfaces (32%) and water (22%) within 3 km, water (45%) and trees (41%) within 16 km, and trees (50%) and water (45%) 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 Sanya (18.2543°, 109.5095°, elevation 1 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.