Samut Sakhon weather in May

In May, Samut Sakhon sees average daytime highs of 32°C and overnight lows near 28°C, with 137 mm of rain across 20.4 wet days and about 12.6 hours of daylight. It is the 2nd-warmest and 3rd-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 12% 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 42 min by month's end. Set against the rest of the year, May is Samut Sakhon's 8th-clearest and 7th-windiest month. For the whole year in context, see Samut Sakhon's year-round climate.

Daytime high
32°
2nd warmest
Overnight low
28°
12th coldest
Rainfall
137 mm
20.4 wet days
Daylight
12 h 36 min
5:56 AM – 6:34 PM
Cloud cover
77%
8th clearest
Wind
12 km/h
7th windiest
Solar energy
5.7 kWh/m²
Travel score
3.0
out of 10

Samut Sakhon is city in Samut Sakhon province, Thailand.

Air quality
High
PM2.5 29 µg/m³ · 2019
Density
6,147/km²
people per km²
Founded
1548

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 Samut Sakhon reaches about 32°C in the afternoon and slips back to 28°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 33°C. Set against its neighbours, May runs on par with April and on par with June.

25°28°30°33°35°151015202531
Avg high (°C)Avg low (°C)
13228
23228
33228
43228
53228
63228
73228
83228
93228
103228
113228
123228
133228
143228
153228
163228
173228
183228
193228
203228
213228
223228
233228
243228
253228
263228
273228
283228
293228
303228
313228

How May really feels in Samut Sakhon

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.

Samut Sakhon weather by month

How May compares with the rest of the year at a glance. May is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°152.711.36.5
Feb30° / 25°122.611.56.2
Mar31° / 27°436.411.95.2
Apr32° / 28°749.712.34.1
May32° / 28°13720.412.63.0
Jun31° / 28°11120.812.82.9
Jul31° / 27°1142112.73.1
Aug31° / 27°12522.112.53.1
Sep30° / 27°21924.512.12.9
Oct30° / 26°22721.511.73.6
Nov30° / 25°506.711.45.2
Dec30° / 24°112.211.26.3

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 11% of May, with mostly cloudy or overcast conditions the remaining 77%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24555
34456
44159
53961
63763
73565
83367
93169
103070
112773
122575
132476
142278
152179
161981
171981
181684
191684
201684
211486
221486
231486
241486
251486
261387
271387
281387
291288
301090
311090

Chance of precipitation in May

Any precipitation

Samut Sakhon gets around 137 mm of rain over 20.4 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 65% and peaks near 73% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
149
250
351
453
554
655
756
858
959
1061
1163
1264
1366
1467
1568
1669
1770
1871
1971
2072
2172
2273
2373
2473
2573
2673
2773
2873
2973
3073
3173

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 91% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1793
2793
3793
4793
5793
6892
7892
8892
9892
10892
11991
12991
13991
14991
15991
16991
171090
181090
191090
201090
211090
221090
231189
241189
251189
261189
271189
281189
291288
301288
311288

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 12 h 30 min at the start of May to 12 h 42 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 6:02 AM to 5:54 AM, and sunset from 6:30 PM to 6:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
112.56:026:30
212.56:016:31
312.56:016:31
412.56:006:31
512.56:006:31
612.56:006:31
712.55:596:32
812.55:596:32
912.65:596:32
1012.65:586:32
1112.65:586:33
1212.65:586:33
1312.65:576:33
1412.65:576:33
1512.65:576:34
1612.65:566:34
1712.65:566:34
1812.65:566:34
1912.65:566:35
2012.75:566:35
2112.75:556:35
2212.75:556:36
2312.75:556:36
2412.75:556:36
2512.75:556:36
2612.75:556:37
2712.75:556:37
2812.75:546:37
2912.75:546:38
3012.75:546:38
3112.75:546:38

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.7 kWh/m².

For context, solar energy here swings from a low near 4.6 kWh/m² to a high of 6.33 kWh/m² in April across the year — May's 5.7 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
16.1Intense
26.0Intense
36.0Intense
46.0Bright
56.0Bright
65.9Bright
75.9Bright
85.9Bright
95.8Bright
105.8Bright
115.8Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.6Bright
215.6Bright
225.6Bright
235.6Bright
245.6Bright
255.5Bright
265.5Bright
275.5Bright
285.5Bright
295.5Bright
305.5Bright
315.5Bright
Planning a trip in May

Hazard calendar for Samut Sakhon

In seasonPeak

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

Samut Sakhon sits in the Pacific typhoon belt; the season peaks July–October.

Samut Sakhon'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 May a good time to visit Samut Sakhon?

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

3.0
Sightseeing
10th-best month of the year
4.8
Beach & pool
8th-best month of the year

May is a weaker month for outdoor sightseeing in Samut Sakhon.

What to pack for Samut Sakhon in May

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

In May, Samut Sakhon sees daytime highs around 32°C and nights near 28°C. Pack light clothes and rain gear. Worth having: sun protection. About 20 days see rain.

light clothesrain gearsun protection

Sea temperature near Samut Sakhon in May

The nearest coast averages about 31°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 22 km away) is warmest in May at about 31°C and coldest in January near 27°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
Jan27Warm
Feb28Warm
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Samut Sakhon in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Samut Sakhon peaks around August 16 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 at about 8 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 16UV 13Nov 21UV 8
UV index (midday)Level
Jan9Very high
Feb9Very high
Mar12Extreme
Apr12Extreme
May11Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct9Very high
Nov8Very high
Dec8Very high

Air quality in Samut Sakhon 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 Samut Sakhon is worst in January — around 45 µg/m³ PM2.5 (poor), about 2.5× the cleanest month (August, 18 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Samut Sakhon's WHO annual average of 29 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorJan 1544 µg/m³Aug 1018 µg/m³
PM2.5 (µg/m³)Level
Jan45Poor
Feb38Poor
Mar27Moderate
Apr24Moderate
May21Moderate
Jun18Moderate
Jul18Moderate
Aug18Moderate
Sep23Moderate
Oct34Moderate
Nov40Poor
Dec40Poor
Location & terrain

Where is Samut Sakhon?

Samut Sakhon sits at 13.5°N, 100.3°E, 14 m above sea level, in Thailand. The nearest listed city is Krathum Baen, 12 km away.

Topography around Samut Sakhon

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

Within 3 km, the terrain around Samut Sakhon has only modest variations in elevation — a maximum elevation change of 16 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 42 m; within 80 km, large variations in elevation — a maximum elevation change of 638 m.

The land around Samut Sakhon is covered by artificial surfaces (57%) and trees (22%) within 3 km, water (41%), trees (22%) and artificial surfaces (20%) within 16 km, and water (34%), cropland (25%) and trees (20%) within 80 km.

3 km
16 m
16 km
42 m
80 km
638 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
May weather nearby: Krathum Baen 12 km · Ban Samae Dam 13 km · Bang Bon Nuea 15 km · Ban Khlong Bang Bon 15 km · Bangbontai 15 km · Ban Khlong Bang Phran 18 km · Bang Bon 18 km · Ban Phaeo 19 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 Samut Sakhon (13.5475°, 100.2736°, elevation 14 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).