Lý Sơn weather in May

In May, Lý Sơn sees average daytime highs of 31°C and overnight lows near 27°C, with 82 mm of rain across 12.1 wet days and about 12.7 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 26% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 30 min at the start of May to 12 h 48 min by month's end. Set against the rest of the year, May is Lý Sơn's 6th-clearest and 8th-windiest month. For the whole year in context, see Lý Sơn's year-round climate.

Daytime high
31°
4th warmest
Overnight low
27°
9th coldest
Rainfall
82 mm
12.1 wet days
Daylight
12 h 42 min
5:18 AM – 6:01 PM
Cloud cover
66%
6th clearest
Wind
13 km/h
8th windiest
Solar energy
6.48 kWh/m²
Travel score
4.4
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical May day in Lý Sơn reaches about 31°C in the afternoon and slips back to 27°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 32°C. Set against its neighbours, May runs about 2°C warmer than April and about 1°C cooler than June.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13026
23026
33026
43027
53027
63027
73027
83027
93027
103027
113027
123127
133127
143127
153127
163127
173127
183127
193127
203127
213127
223127
233127
243127
253127
263127
273128
283128
293128
303128
313128

How May really feels in Lý Sơn

Once humidity and wind are folded in, May averages 31 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
31
9 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

The story in May is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Lý Sơn weather by month

How May compares with the rest of the year at a glance. May is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 22°12516.811.25.9
Feb25° / 22°7110.611.56.8
Mar27° / 24°728.911.97.0
Apr29° / 25°547.612.36.1
May31° / 27°8212.112.74.4
Jun32° / 28°6511.312.93.7
Jul32° / 28°8112.812.83.8
Aug31° / 28°11617.312.53.4
Sep30° / 26°27322.712.13.4
Oct28° / 25°37525.111.74.0
Nov27° / 24°37722.511.34.6
Dec25° / 23°2912311.14.8

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 26% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15446
25347
35248
45248
55149
65149
75050
84852
94852
104753
114555
124555
134357
144258
154159
163961
173862
183763
193466
203466
213367
223169
233169
243169
253070
263070
273070
283169
293169
303169
313169

Chance of precipitation in May

Any precipitation

Lý Sơn gets around 82 mm of rain over 12.1 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 46% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
127
227
328
429
530
631
732
832
933
1034
1135
1236
1337
1437
1538
1639
1740
1841
1942
2042
2143
2244
2344
2445
2545
2646
2746
2846
2946
3045
3145

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the miserable band about 92% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Muggy (%)Oppressive (%)Miserable (%)
101585
201486
301387
401288
501189
601090
701090
80991
90991
100892
111891
121891
131891
141792
151792
161792
171792
181792
191693
201693
211693
220694
230595
240595
250595
260496
270496
280397
290397
300397
310298

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 11 km/h on the calmest days to 15 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1014light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1712light breeze
1812light breeze
1912light breeze
2012calm
2112calm
2212calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 18 minutes over May. Sunrise moves from 5:24 AM to 5:16 AM, and sunset from 5:57 PM to 6:06 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:245:57
212.65:245:57
312.65:235:58
412.65:235:58
512.65:225:58
612.65:225:58
712.65:225:59
812.65:215:59
912.65:215:59
1012.65:205:59
1112.75:206:00
1212.75:206:00
1312.75:196:00
1412.75:196:01
1512.75:196:01
1612.75:186:01
1712.75:186:01
1812.75:186:02
1912.75:186:02
2012.85:176:02
2112.85:176:03
2212.85:176:03
2312.85:176:03
2412.85:176:04
2512.85:166:04
2612.85:166:04
2712.85:166:05
2812.85:166:05
2912.85:166:05
3012.85:166:06
3112.85:166:06

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6.48 kWh/m² — the sunniest month for solar.

For context, solar energy here swings from a low near 3.15 kWh/m² to a high of 6.48 kWh/m² in May across the year — May's 6.48 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.6Intense
26.6Intense
36.6Intense
46.6Intense
56.6Intense
66.6Intense
76.6Intense
86.5Intense
96.5Intense
106.5Intense
116.5Intense
126.5Intense
136.5Intense
146.5Intense
156.5Intense
166.5Intense
176.4Intense
186.4Intense
196.4Intense
206.4Intense
216.4Intense
226.4Intense
236.4Intense
246.4Intense
256.4Intense
266.4Intense
276.4Intense
286.4Intense
296.4Intense
306.4Intense
316.4Intense
Planning a trip in May

Hazard calendar for Lý Sơn

In seasonPeak

In May, Lý Sơn sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Lý Sơn sits in the Pacific typhoon belt; the season peaks July–October.

Lý Sơn's monsoon runs September–December, when most of the year's rain falls.

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

Is May a good time to visit Lý Sơn?

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

4.4
Sightseeing
7th-best month of the year
6.4
Beach & pool
3rd-best month of the year

May is a reasonable time to visit Lý Sơn for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Lý Sơn in May

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

In May, Lý Sơn sees daytime highs around 31°C and nights near 27°C. Pack light clothes and sun protection. Worth having: rain gear. About 12 days see rain.

light clothessun protectionrain gear

Sea temperature near Lý Sơn in May

The nearest coast averages about 28°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 30°C and coldest in February near 24°C.

The water stays above 20°C all year — warm enough for a swim any month.

22°24°26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan24Warm
Feb24Refreshing
Mar25Warm
Apr26Warm
May28Tropical
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov27Warm
Dec25Warm

UV index in Lý Sơn in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks 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 Lý Sơn peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 12UV 13Dec 16UV 7
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct11Extreme
Nov9Very high
Dec7High

Air quality in Lý Sơn in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Lý Sơn is worst in March — around 35 µg/m³ PM2.5 (moderate), about 2.3× the cleanest month (November, 15 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 2335 µg/m³Nov 1815 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb22Moderate
Mar35Moderate
Apr34Moderate
May28Moderate
Jun23Moderate
Jul17Moderate
Aug17Moderate
Sep17Moderate
Oct17Moderate
Nov15Moderate
Dec16Moderate
Location & terrain

Where is Lý Sơn?

Lý Sơn sits at 15.4°N, 109.1°E, 22 m above sea level, in Vietnam. The nearest listed city is Mỹ Lại, 32 km away.

Hoi AnĐông Phú

Topography around Lý Sơn

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Lý Sơn.

Within 3 km, the terrain around Lý Sơn has only modest variations in elevation — a maximum elevation change of 163 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 163 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,379 m.

The land around Lý Sơn is covered by water (72%) within 3 km, water (99%) within 16 km, and water (66%) and trees (26%) within 80 km.

3 km
163 m
16 km
163 m
80 km
1,379 m
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Mỹ Lại 32 km · Mỹ Khê 34 km · Quảng Ngãi 45 km · Núi Thành 50 km · Đức Phổ 64 km · Tam Kỳ 73 km · Hoi An 101 km · Đông Phú 102 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 1%

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 Lý Sơn (15.372°, 109.1189°, elevation 22 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).