Sanya weather in January
In January, Sanya sees average daytime highs of 23°C and overnight lows near 19°C, with 12 mm of rain across 2.3 wet days and about 11 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 23°C through the month. The sky is clear or mostly clear about 42% of the time in January, and the air most often feels humid.
Daylight stretches from about 10 h 54 min at the start of January to 11 h 12 min by month's end. Set against the rest of the year, January is Sanya's 6th-clearest and 3rd-windiest month. For the whole year in context, see Sanya's year-round climate.
- Daytime high
- 23°
- 12th warmest
- Overnight low
- 19°
- 1st coldest
- Rainfall
- 12 mm
- 2.3 wet days
- Daylight
- 11 hours
- 7:21 AM – 6:22 PM
- Cloud cover
- 50%
- 6th clearest
- Wind
- 16 km/h
- 3rd windiest
- Solar energy
- 4 kWh/m²
- Travel score
- 8.2
- out of 10
Sanya is prefecture-level city in Hainan, China.
- Air quality
- Elevated
- PM2.5 15.5 µg/m³ · 2018
- Density
- 537/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in January
Day-to-day highs hold fairly steady near 23°C through the month.
A typical January day in Sanya reaches about 23°C in the afternoon and slips back to 19°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 25°C. Set against its neighbours, January runs about 1°C cooler than December and on par with February.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg low (°C) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 18 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 23 | 19 |
| 2 | 23 | 19 |
| 3 | 23 | 19 |
| 4 | 23 | 19 |
| 5 | 23 | 19 |
| 6 | 23 | 19 |
| 7 | 23 | 19 |
| 8 | 23 | 19 |
| 9 | 23 | 19 |
| 10 | 23 | 19 |
| 11 | 23 | 19 |
| 12 | 23 | 19 |
| 13 | 23 | 19 |
| 14 | 23 | 19 |
| 15 | 23 | 19 |
| 16 | 23 | 18 |
| 17 | 23 | 18 |
| 18 | 23 | 18 |
| 19 | 23 | 18 |
| 20 | 23 | 18 |
| 21 | 23 | 18 |
| 22 | 23 | 18 |
| 23 | 23 | 18 |
| 24 | 23 | 18 |
| 25 | 23 | 18 |
| 26 | 23 | 18 |
| 27 | 23 | 18 |
| 28 | 23 | 18 |
| 29 | 23 | 18 |
| 30 | 23 | 18 |
| 31 | 23 | 18 |
How January really feels in Sanya
Once humidity and wind are folded in, January averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
January sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Sanya weather by month
How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.
| 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 January
The sky is clear or mostly clear about 42% of the time in January.
Beyond those clear spells, partly cloudy skies cover about 25% of January, with mostly cloudy or overcast conditions the remaining 34%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 71 | 71 | 69 | 69 | 68 | 68 | 66 | 66 | 65 | 65 | 64 | 64 | 63 | 63 | 63 | 63 | 63 | 64 | 64 | 64 | 65 | 66 | 66 | 66 | 68 | 68 | 68 | 69 | 69 | 70 | 70 |
| Cloudier (%) | 29 | 29 | 31 | 31 | 32 | 32 | 34 | 34 | 35 | 35 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 36 | 36 | 36 | 35 | 34 | 34 | 34 | 32 | 32 | 32 | 31 | 31 | 30 | 30 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 71 | 29 |
| 2 | 71 | 29 |
| 3 | 69 | 31 |
| 4 | 69 | 31 |
| 5 | 68 | 32 |
| 6 | 68 | 32 |
| 7 | 66 | 34 |
| 8 | 66 | 34 |
| 9 | 65 | 35 |
| 10 | 65 | 35 |
| 11 | 64 | 36 |
| 12 | 64 | 36 |
| 13 | 63 | 37 |
| 14 | 63 | 37 |
| 15 | 63 | 37 |
| 16 | 63 | 37 |
| 17 | 63 | 37 |
| 18 | 64 | 36 |
| 19 | 64 | 36 |
| 20 | 64 | 36 |
| 21 | 65 | 35 |
| 22 | 66 | 34 |
| 23 | 66 | 34 |
| 24 | 66 | 34 |
| 25 | 68 | 32 |
| 26 | 68 | 32 |
| 27 | 68 | 32 |
| 28 | 69 | 31 |
| 29 | 69 | 31 |
| 30 | 70 | 30 |
| 31 | 70 | 30 |
Chance of precipitation in January
Sanya gets around 12 mm of rain over 2.3 wet days in January. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 7% and peaks near 8% on the wettest days.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Rain chance (%) | |
|---|---|
| 1 | 6 |
| 2 | 7 |
| 3 | 7 |
| 4 | 7 |
| 5 | 7 |
| 6 | 7 |
| 7 | 7 |
| 8 | 8 |
| 9 | 8 |
| 10 | 8 |
| 11 | 8 |
| 12 | 8 |
| 13 | 8 |
| 14 | 8 |
| 15 | 8 |
| 16 | 8 |
| 17 | 8 |
| 18 | 8 |
| 19 | 8 |
| 20 | 8 |
| 21 | 8 |
| 22 | 8 |
| 23 | 7 |
| 24 | 7 |
| 25 | 7 |
| 26 | 7 |
| 27 | 7 |
| 28 | 7 |
| 29 | 7 |
| 30 | 7 |
| 31 | 7 |
Humidity in January
Most of January feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, January lands in the humid band about 33% of days. Sticky, muggy-or-worse air turns up on roughly 35% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| Comfortable (%) | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 19 | 19 | 20 | 20 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
| Humid (%) | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 33 | 33 | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 |
| Muggy (%) | 31 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Oppressive (%) | 3 | 3 | 3 | 4 | 4 | 4 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 13 | 19 | 34 | 31 | 3 |
| 2 | 13 | 19 | 34 | 32 | 3 |
| 3 | 12 | 19 | 34 | 32 | 3 |
| 4 | 12 | 19 | 33 | 32 | 4 |
| 5 | 12 | 19 | 33 | 32 | 4 |
| 6 | 12 | 19 | 33 | 32 | 4 |
| 7 | 12 | 18 | 33 | 32 | 5 |
| 8 | 12 | 18 | 33 | 32 | 5 |
| 9 | 13 | 18 | 32 | 32 | 5 |
| 10 | 13 | 18 | 32 | 32 | 5 |
| 11 | 13 | 17 | 32 | 32 | 5 |
| 12 | 13 | 17 | 32 | 32 | 6 |
| 13 | 13 | 17 | 32 | 32 | 6 |
| 14 | 13 | 17 | 33 | 31 | 6 |
| 15 | 14 | 17 | 33 | 31 | 6 |
| 16 | 14 | 17 | 33 | 31 | 5 |
| 17 | 14 | 17 | 33 | 31 | 5 |
| 18 | 14 | 18 | 33 | 30 | 5 |
| 19 | 14 | 18 | 34 | 30 | 5 |
| 20 | 13 | 19 | 34 | 30 | 4 |
| 21 | 13 | 19 | 34 | 30 | 4 |
| 22 | 13 | 20 | 34 | 30 | 4 |
| 23 | 13 | 20 | 34 | 29 | 3 |
| 24 | 13 | 20 | 34 | 29 | 3 |
| 25 | 13 | 21 | 34 | 29 | 3 |
| 26 | 13 | 21 | 33 | 29 | 3 |
| 27 | 13 | 21 | 33 | 29 | 3 |
| 28 | 13 | 21 | 33 | 29 | 4 |
| 29 | 13 | 21 | 33 | 29 | 4 |
| 30 | 13 | 21 | 33 | 29 | 4 |
| 31 | 13 | 21 | 33 | 29 | 4 |
Wind in January
Winds average 16 km/h in January.
Across January, daily wind ranges from about 15 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 16 | 15 |
| Feels | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 17 | light breeze |
| 2 | 17 | light breeze |
| 3 | 17 | light breeze |
| 4 | 17 | light breeze |
| 5 | 17 | light breeze |
| 6 | 16 | light breeze |
| 7 | 16 | light breeze |
| 8 | 16 | light breeze |
| 9 | 16 | light breeze |
| 10 | 16 | light breeze |
| 11 | 16 | light breeze |
| 12 | 16 | light breeze |
| 13 | 16 | light breeze |
| 14 | 16 | light breeze |
| 15 | 16 | light breeze |
| 16 | 16 | light breeze |
| 17 | 16 | light breeze |
| 18 | 16 | light breeze |
| 19 | 16 | light breeze |
| 20 | 16 | light breeze |
| 21 | 16 | light breeze |
| 22 | 16 | light breeze |
| 23 | 16 | light breeze |
| 24 | 16 | light breeze |
| 25 | 16 | light breeze |
| 26 | 16 | light breeze |
| 27 | 16 | light breeze |
| 28 | 16 | light breeze |
| 29 | 16 | light breeze |
| 30 | 16 | light breeze |
| 31 | 15 | light breeze |
Sunrise & sunset in January
Daylight runs from about 10 h 54 min at the start of January to 11 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 18 minutes over January. Sunrise moves from 7:17 AM to 7:20 AM, and sunset from 6:13 PM to 6:31 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 10.9 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.0 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.1 | 11.2 | 11.2 | 11.2 |
| Sunrise (AM) | 7:17 | 7:18 | 7:18 | 7:18 | 7:19 | 7:19 | 7:19 | 7:19 | 7:20 | 7:20 | 7:20 | 7:20 | 7:20 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:21 | 7:20 | 7:20 | 7:20 |
| Sunset (PM) | 6:13 | 6:13 | 6:14 | 6:14 | 6:15 | 6:16 | 6:16 | 6:17 | 6:17 | 6:18 | 6:19 | 6:19 | 6:20 | 6:20 | 6:21 | 6:22 | 6:22 | 6:23 | 6:24 | 6:24 | 6:25 | 6:25 | 6:26 | 6:27 | 6:27 | 6:28 | 6:28 | 6:29 | 6:29 | 6:30 | 6:31 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 10.9 | 7:17 | 6:13 |
| 2 | 10.9 | 7:18 | 6:13 |
| 3 | 10.9 | 7:18 | 6:14 |
| 4 | 10.9 | 7:18 | 6:14 |
| 5 | 10.9 | 7:19 | 6:15 |
| 6 | 10.9 | 7:19 | 6:16 |
| 7 | 11.0 | 7:19 | 6:16 |
| 8 | 11.0 | 7:19 | 6:17 |
| 9 | 11.0 | 7:20 | 6:17 |
| 10 | 11.0 | 7:20 | 6:18 |
| 11 | 11.0 | 7:20 | 6:19 |
| 12 | 11.0 | 7:20 | 6:19 |
| 13 | 11.0 | 7:20 | 6:20 |
| 14 | 11.0 | 7:21 | 6:20 |
| 15 | 11.0 | 7:21 | 6:21 |
| 16 | 11.0 | 7:21 | 6:22 |
| 17 | 11.0 | 7:21 | 6:22 |
| 18 | 11.0 | 7:21 | 6:23 |
| 19 | 11.0 | 7:21 | 6:24 |
| 20 | 11.1 | 7:21 | 6:24 |
| 21 | 11.1 | 7:21 | 6:25 |
| 22 | 11.1 | 7:21 | 6:25 |
| 23 | 11.1 | 7:21 | 6:26 |
| 24 | 11.1 | 7:21 | 6:27 |
| 25 | 11.1 | 7:21 | 6:27 |
| 26 | 11.1 | 7:21 | 6:28 |
| 27 | 11.1 | 7:21 | 6:28 |
| 28 | 11.1 | 7:21 | 6:29 |
| 29 | 11.2 | 7:20 | 6:29 |
| 30 | 11.2 | 7:20 | 6:30 |
| 31 | 11.2 | 7:20 | 6:31 |
Solar energy in January
Average shortwave solar energy reaching the ground each day in January, about 4 kWh/m².
For context, solar energy here swings from a low near 3.79 kWh/m² to a high of 5.82 kWh/m² in April across the year — January's 4 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 3.9 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.0 | 4.1 | 4.1 | 4.1 | 4.1 | 4.1 | 4.2 | 4.2 | 4.2 | 4.3 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 3.9 | Moderate |
| 2 | 3.9 | Moderate |
| 3 | 3.9 | Moderate |
| 4 | 3.9 | Moderate |
| 5 | 3.9 | Moderate |
| 6 | 3.9 | Moderate |
| 7 | 3.9 | Moderate |
| 8 | 3.9 | Moderate |
| 9 | 3.9 | Moderate |
| 10 | 3.9 | Moderate |
| 11 | 3.9 | Moderate |
| 12 | 3.9 | Moderate |
| 13 | 4.0 | Moderate |
| 14 | 4.0 | Moderate |
| 15 | 4.0 | Moderate |
| 16 | 4.0 | Moderate |
| 17 | 4.0 | Moderate |
| 18 | 4.0 | Moderate |
| 19 | 4.0 | Moderate |
| 20 | 4.0 | Bright |
| 21 | 4.0 | Bright |
| 22 | 4.0 | Bright |
| 23 | 4.1 | Bright |
| 24 | 4.1 | Bright |
| 25 | 4.1 | Bright |
| 26 | 4.1 | Bright |
| 27 | 4.1 | Bright |
| 28 | 4.2 | Bright |
| 29 | 4.2 | Bright |
| 30 | 4.2 | Bright |
| 31 | 4.3 | Bright |
Hazard calendar for Sanya
In January, Sanya sits inside its pacific typhoon 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 January a good time to visit Sanya?
Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
January is one of the better times to visit Sanya for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Sanya in January
From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In January, Sanya sees daytime highs around 23°C and nights near 19°C. Worth packing: light clothes.
Sea temperature near Sanya in January
The nearest coast averages about 23°C in January — 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 January
Clear-sky midday UV in January peaks around 8 — enough to warrant sun protection. 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 January
Average fine-particle pollution (PM2.5) through the year — so you can see where January 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).