Samut Sakhon weather in September

In September, Samut Sakhon sees average daytime highs of 30°C and overnight lows near 27°C, with 219 mm of rain across 24.5 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 30°C through the month. The sky is clear or mostly clear about 3% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 18 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Samut Sakhon's 9th-clearest and 11th-windiest month. For the whole year in context, see Samut Sakhon's year-round climate.

Daytime high
30°
7th warmest
Overnight low
27°
6th coldest
Rainfall
219 mm
24.5 wet days
Daylight
12 h 06 min
6:11 AM – 6:15 PM
Cloud cover
85%
9th clearest
Wind
10 km/h
11th windiest
Solar energy
4.72 kWh/m²
Travel score
2.9
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 September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 30°C through the month.

A typical September day in Samut Sakhon reaches about 30°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, September runs on par with August and on par with October.

25°28°30°33°35°151015202530
Avg high (°C)Avg low (°C)
13127
23127
33127
43127
53127
63127
73127
83127
93127
103127
113127
123127
133027
143027
153027
163027
173027
183027
193027
203027
213027
223026
233026
243026
253026
263026
273026
283026
293026
303026

How September really feels in Samut Sakhon

Once humidity and wind are folded in, September averages 30 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
30
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Samut Sakhon weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 2nd-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 September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2991
3991
41090
51090
61090
71090
81090
91090
101090
111090
121090
131090
14991
15991
16991
171189
181189
191288
201288
211288
221387
231387
241387
251486
261486
271486
281486
291684
301684

Chance of precipitation in September

Any precipitation

Samut Sakhon gets around 219 mm of rain over 24.5 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 83% and peaks near 85% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
177
278
378
479
580
680
781
881
982
1083
1183
1284
1384
1484
1585
1685
1785
1885
1985
2084
2184
2284
2384
2484
2584
2684
2784
2885
2985
3085

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 66% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14456
24555
34555
44555
54555
64555
74555
84456
94456
104357
114258
124159
133961
143862
153664
163565
173466
183268
193169
202971
212872
222674
232575
242476
252377
262278
272179
282080
292080
302080

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 8 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 18 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 24 minutes over September. Sunrise moves from 6:11 AM to 6:11 AM, and sunset from 6:27 PM to 6:05 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:116:27
212.36:116:26
312.26:116:25
412.26:116:24
512.26:116:24
612.26:116:23
712.26:116:22
812.26:116:21
912.26:116:21
1012.26:116:20
1112.16:116:19
1212.16:116:18
1312.16:116:18
1412.16:116:17
1512.16:116:16
1612.16:116:15
1712.16:116:15
1812.06:116:14
1912.06:116:13
2012.06:116:12
2112.06:116:12
2212.06:116:11
2312.06:116:10
2412.06:116:09
2512.06:116:09
2611.96:116:08
2711.96:116:07
2811.96:116:06
2911.96:116:06
3011.96:116:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.72 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 — September's 4.72 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.7Bright
134.7Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.6Bright
194.6Bright
204.6Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Samut Sakhon

In seasonPeak

In September, 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 September a good time to visit Samut Sakhon?

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

2.9
Sightseeing
11th-best month of the year
4.2
Beach & pool
12th-best month of the year

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

What to pack for Samut Sakhon in September

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

In September, Samut Sakhon sees daytime highs around 30°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 25 days see rain.

light clothesrain gearsun protection

Sea temperature near Samut Sakhon in September

The nearest coast averages about 30°C in September — 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 September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 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 September

GoodModeratePoorUnhealthyVery unhealthy

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