Lang Suan weather in May

In May, Lang Suan sees average daytime highs of 32°C and overnight lows near 25°C, with 201 mm of rain across 24.3 wet days and about 12.4 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 5% of the time in May, and the air most often feels miserable.

Daylight stretches from about 12 h 18 min at the start of May to 12 h 30 min by month's end. Set against the rest of the year, May is Lang Suan's 7th-clearest and 10th-windiest month. For the whole year in context, see Lang Suan's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
25°
12th coldest
Rainfall
201 mm
24.3 wet days
Daylight
12 h 30 min
6:06 AM – 6:34 PM
Cloud cover
81%
7th clearest
Wind
8 km/h
10th windiest
Solar energy
5.5 kWh/m²
Travel score
2.4
out of 10

Lang Suan is town in Lang Suan district, Chumphon province, Thailand.

Founded
1940

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical May day in Lang Suan reaches about 32°C in the afternoon and slips back to 25°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, May runs about 1°C cooler than April and about 1°C warmer than June.

20°25°30°35°40°151015202531
Avg high (°C)Avg low (°C)
13325
23325
33325
43325
53325
63325
73325
83325
93325
103325
113325
123325
133325
143325
153325
163225
173225
183225
193225
203225
213225
223225
233225
243225
253225
263225
273225
283225
293225
303225
313225

How May really feels in Lang Suan

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
31 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.

Lang Suan weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 22°6810.411.55.3
Feb31° / 22°387.811.75.0
Mar32° / 23°9311.511.93.9
Apr33° / 24°11816.112.22.9
May32° / 25°20124.312.42.4
Jun31° / 25°18821.712.62.9
Jul31° / 24°20623.312.53.0
Aug31° / 24°22524.712.32.9
Sep30° / 24°30226.612.12.8
Oct30° / 23°32627.411.82.9
Nov29° / 23°21421.911.53.7
Dec29° / 22°10313.811.45.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 9% of May, with mostly cloudy or overcast conditions the remaining 85%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22674
32674
42575
52278
62278
72080
82080
91882
101783
111684
121684
131486
141486
151387
161387
171189
181189
191189
201090
211090
221090
231090
241090
251090
26991
27991
28991
29991
30991
31991

Chance of precipitation in May

Any precipitation

Lang Suan gets around 201 mm of rain over 24.3 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 78% and peaks near 80% on the wettest days.

0%20%40%60%80%151015202531
Rain chance (%)
172
274
375
475
576
677
777
878
978
1078
1178
1278
1378
1478
1578
1678
1778
1878
1978
2078
2178
2279
2379
2479
2580
2680
2780
2880
2980
3080
3180

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 73% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
13565
23466
33367
43268
53169
63169
73070
83070
92971
102971
112872
122872
132773
142773
152773
162674
172674
182575
192575
202476
212476
222377
232377
242278
252278
262278
272278
282278
292278
302278
312278

Wind in May

Winds average 8 km/h in May.

Across May, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
148calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 18 min at the start of May to 12 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 12 minutes over May. Sunrise moves from 6:10 AM to 6:05 AM, and sunset from 6:31 PM to 6:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:106:31
212.46:106:31
312.46:106:31
412.46:096:32
512.46:096:32
612.46:096:32
712.46:086:32
812.46:086:32
912.46:086:32
1012.46:086:32
1112.46:076:33
1212.46:076:33
1312.46:076:33
1412.46:076:33
1512.46:066:33
1612.56:066:34
1712.56:066:34
1812.56:066:34
1912.56:066:34
2012.56:066:34
2112.56:066:35
2212.56:056:35
2312.56:056:35
2412.56:056:35
2512.56:056:36
2612.56:056:36
2712.56:056:36
2812.56:056:36
2912.56:056:37
3012.56:056:37
3112.56:056:37

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.5 kWh/m².

For context, solar energy here swings from a low near 4.38 kWh/m² to a high of 6.29 kWh/m² in March across the year — May's 5.5 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.8Bright
45.8Bright
55.8Bright
65.8Bright
75.7Bright
85.7Bright
95.7Bright
105.6Bright
115.6Bright
125.6Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.4Bright
185.4Bright
195.4Bright
205.4Bright
215.4Bright
225.3Bright
235.3Bright
245.3Bright
255.3Bright
265.3Bright
275.3Bright
285.3Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in May

Hazard calendar for Lang Suan

In seasonPeak

In May, Lang Suan sits inside its cyclone and rainy season season. The full year is below, with each hazard's peak months called out.

Lang Suan sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.

Lang Suan's rainy season runs May–November, when most of the year's rain falls.

Cyclone
Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Lang Suan?

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

2.4
Sightseeing
12th-best month of the year
4.1
Beach & pool
10th-best month of the year

May is a weaker month for outdoor sightseeing in Lang Suan.

What to pack for Lang Suan in May

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

In May, Lang Suan sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Lang Suan in May

The nearest coast averages about 30°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 33 km away) is warmest in May at about 30°C and coldest in January near 28°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan28Warm
Feb28Tropical
Mar29Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Lang Suan 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 Lang Suan peaks around August 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highAug 20UV 13Dec 20UV 9
UV index (midday)Level
Jan10Very high
Feb12Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep13Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in Lang Suan 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 Lang Suan is worst in January — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJan 2318 µg/m³Oct 1613 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb18Moderate
Mar18Moderate
Apr18Moderate
May15Moderate
Jun14Moderate
Jul15Moderate
Aug13Moderate
Sep13Moderate
Oct13Moderate
Nov13Moderate
Dec14Moderate
Location & terrain

Where is Lang Suan?

Lang Suan sits at 9.9°N, 99.1°E, 11 m above sea level, in Thailand. The nearest listed city is Ranong, 49 km away.

Surat ThaniTha KhamKo SamuiKo Pha-ngan

Topography around Lang Suan

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

Within 3 km, the terrain around Lang Suan has only modest variations in elevation — a maximum elevation change of 131 m around an average of 13 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 780 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,296 m.

The land around Lang Suan is covered by trees (78%) within 3 km, trees (74%) within 16 km, and trees (50%) and water (47%) within 80 km.

3 km
131 m
16 km
780 m
80 km
1,296 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
May weather nearby: Ranong 49 km · Kawthaung 58 km · Chumphon 62 km · Ko Tao 85 km · Surat Thani 94 km · Tha Kham 94 km · Ko Samui 104 km · Ko Pha-ngan 106 km

Thailand travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C
230 V · 50 Hz
Prices
≈ 31% of US
price level, 2025
GDP per capita
$8,057
2025
Happiness
6.3 / 10
World Happiness, 2025
Homicide rate
4.8
per 100k, 2011
Road deaths
32.2
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Very low
EF EPI 402
Religion
Buddhist 93%Muslim 5%Christian 1%other 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 Lang Suan (9.9456°, 99.0785°, elevation 11 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).