Sanya weather in March

In March, Sanya sees average daytime highs of 25°C and overnight lows near 22°C, with 18 mm of rain across 3.8 wet days and about 11.9 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 24°C in the first days to 26°C by the end. The sky is clear or mostly clear about 43% of the time in March, and the air most often feels oppressive.

Daylight stretches from about 11 h 36 min at the start of March to 12 h 06 min by month's end. Set against the rest of the year, March is Sanya's 3rd-clearest and 6th-windiest month. For the whole year in context, see Sanya's year-round climate.

Daytime high
25°
9th warmest
Overnight low
22°
4th coldest
Rainfall
18 mm
3.8 wet days
Daylight
11 h 54 min
6:55 AM – 6:48 PM
Cloud cover
48%
3rd clearest
Wind
14 km/h
6th windiest
Solar energy
5.28 kWh/m²
Travel score
7.9
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 March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 24°C in the first days to 26°C by the end.

A typical March day in Sanya reaches about 25°C in the afternoon and slips back to 22°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 27°C. Set against its neighbours, March runs about 2°C warmer than February and about 2°C cooler than April.

15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12421
22421
32421
42521
52521
62521
72521
82521
92521
102521
112521
122521
132521
142522
152522
162522
172522
182622
192622
202622
212622
222622
232622
242622
252622
262623
272623
282623
292623
302623
312623

How March really feels in Sanya

Once humidity and wind are folded in, March 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.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

March 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 March compares with the rest of the year at a glance. March is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 19°122.3118.2
Feb24° / 19°102.511.48.2
Mar25° / 22°183.811.97.9
Apr28° / 24°538.612.46.6
May29° / 26°1391912.84.3
Jun30° / 27°21222.213.13.4
Jul29° / 26°28023133.6
Aug29° / 26°26124.412.63.5
Sep29° / 26°25822.312.13.8
Oct28° / 24°1821411.65.7
Nov26° / 22°545.611.17.5
Dec24° / 19°26310.98.2

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 25% of March, with mostly cloudy or overcast conditions the remaining 31%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17129
27129
37228
47327
57327
67327
77327
87228
97327
107327
117327
127228
137228
147228
157030
167030
176931
186832
196733
206634
216535
226535
236436
246436
256436
266436
276436
286436
296436
306436
316436

Chance of precipitation in March

Any precipitation

Sanya gets around 18 mm of rain over 3.8 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 12% and peaks near 20% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
19
29
39
49
59
69
79
89
99
109
119
129
139
1410
1510
1611
1711
1812
1913
2013
2114
2215
2315
2416
2517
2617
2718
2818
2919
3019
3120

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

Most of March feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, March lands in the oppressive band about 48% of days. Sticky, muggy-or-worse air turns up on roughly 84% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1391844260
2281844270
3281844280
4281744280
5271744290
6271644310
7261644320
8261543340
9251443350
10251342370
11241242390
12141141411
13141041431
14131040451
1513939471
1613837491
1713736521
1813735522
1913633552
2013631572
2113630582
2213628593
2313627603
2413625623
2503624634
2603623644
2703522655
2803521665
2903520675
3003519676
3103519667

Wind in March

Winds average 14 km/h in March.

Across March, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1114light breeze
1214light breeze
1314light breeze
1414light breeze
1514light breeze
1614light breeze
1714light breeze
1814light breeze
1914light breeze
2014light breeze
2114light breeze
2214light breeze
2314light breeze
2414light breeze
2514light breeze
2614light breeze
2714light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in March

DaylightNight

Daylight runs from about 11 h 36 min at the start of March to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 30 minutes over March. Sunrise moves from 7:07 AM to 6:43 AM, and sunset from 6:44 PM to 6:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.67:076:44
211.67:066:44
311.67:056:44
411.77:056:45
511.77:046:45
611.77:036:45
711.77:036:45
811.77:026:46
911.77:016:46
1011.87:006:46
1111.86:596:47
1211.86:596:47
1311.86:586:47
1411.86:576:47
1511.96:566:48
1611.96:556:48
1711.96:556:48
1811.96:546:48
1911.96:536:48
2011.96:526:49
2112.06:516:49
2212.06:506:49
2312.06:506:49
2412.06:496:50
2512.06:486:50
2612.06:476:50
2712.16:466:50
2812.16:456:50
2912.16:456:51
3012.16:446:51
3112.16:436:51

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 5.28 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 — March's 5.28 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
35.0Bright
45.0Bright
55.0Bright
65.1Bright
75.1Bright
85.1Bright
95.2Bright
105.2Bright
115.2Bright
125.2Bright
135.2Bright
145.3Bright
155.3Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.3Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in March

Hazard calendar for Sanya

In seasonPeak

In March, 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.

Pacific typhoon
Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is March a good time to visit Sanya?

Our two travel scores rate March for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

7.9
Sightseeing
4th-best month of the year
7.3
Beach & pool
1st-best month of the year

March 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 March

From March's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In March, Sanya sees daytime highs around 25°C and nights near 22°C. Worth packing: light clothes and sun protection. About 4 days see rain.

light clothessun protection

Sea temperature near Sanya in March

The nearest coast averages about 24°C in March — 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.

22°24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan23Refreshing
Feb23Refreshing
Mar24Warm
Apr26Warm
May28Tropical
Jun29Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct28Warm
Nov26Warm
Dec25Warm

UV index in Sanya in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 11 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighAug 11UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar11Extreme
Apr11Extreme
May11Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Sanya in March

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where March 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.

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateDec 1922 µg/m³Aug 1411 µg/m³
PM2.5 (µg/m³)Level
Jan20Moderate
Feb19Moderate
Mar17Moderate
Apr15Moderate
May11Good
Jun12Good
Jul11Good
Aug11Good
Sep11Good
Oct18Moderate
Nov18Moderate
Dec23Moderate
Location & terrain

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.

3 km
203 m
16 km
610 m
80 km
1,775 m
treesgrasslandcroplandartificial surfacesbare terrainwater
March weather nearby: An Hải 278 km · Da Nang 279 km · Sơn Trà 279 km · Thanh Khê 280 km · Hòa Cường 283 km · Hương Thủy 284 km · Hue 285 km · Cẩm Lệ 285 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
unaffiliated 52%folk religion 22%Buddhist 18%Christian 5%

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).