Samut Prakan weather in September

In September, Samut Prakan sees average daytime highs of 30°C and overnight lows near 27°C, with 212 mm of rain across 24.5 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 1st-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 Prakan's 9th-clearest and 11th-windiest month. For the whole year in context, see Samut Prakan's year-round climate.

Daytime high
30°
7th warmest
Overnight low
27°
6th coldest
Rainfall
212 mm
24.5 wet days
Daylight
12 h 06 min
6:10 AM – 6:14 PM
Cloud cover
84%
9th clearest
Wind
10 km/h
11th windiest
Solar energy
4.73 kWh/m²
Travel score
3.0
out of 10

Samut Prakan is city in Samut Prakan province, Thailand.

Air quality
High
PM2.5 25.8 µg/m³ · 2019

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 Prakan 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 31°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
73027
83027
93027
103027
113027
123027
133027
143027
153027
163027
173027
183027
193027
203027
213027
223027
233027
243027
253027
263027
273027
283027
293027
303026

How September really feels in Samut Prakan

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 Prakan weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°15311.36.5
Feb30° / 26°122.611.56.2
Mar31° / 27°385.911.95.3
Apr32° / 28°679.712.34.2
May32° / 28°12418.212.63.2
Jun31° / 28°10020.112.83.0
Jul31° / 28°1072112.73.2
Aug31° / 27°11421.612.53.2
Sep30° / 27°21224.512.13.0
Oct30° / 26°2082111.73.7
Nov30° / 25°436.311.45.2
Dec30° / 24°101.711.26.3

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 88%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1991
2991
31090
41090
51090
61090
71090
81090
91090
101090
111090
12991
13991
14991
15991
16991
171189
181288
191288
201288
211486
221486
231387
241486
251486
261486
271486
281585
291684
301684

Chance of precipitation in September

Any precipitation

Samut Prakan gets around 212 mm of rain over 24.5 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 82% 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 (%)
176
277
377
478
579
679
780
880
981
1081
1182
1282
1383
1483
1584
1684
1784
1884
1984
2084
2184
2284
2384
2484
2584
2685
2785
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 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
12674
22674
32674
42674
52674
62773
72773
82674
92674
102674
112575
122575
132476
142476
152377
162278
172179
182080
191981
201882
211783
221684
231585
241585
251486
261486
271387
281387
291387
301387

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 9 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 6:09 AM to 6:10 AM, and sunset from 6:25 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.36:096:25
212.36:096:25
312.26:096:24
412.26:096:23
512.26:096:22
612.26:106:22
712.26:106:21
812.26:106:20
912.26:106:19
1012.26:106:19
1112.16:106:18
1212.16:106:17
1312.16:106:16
1412.16:106:16
1512.16:106:15
1612.16:106:14
1712.16:106:13
1812.06:106:13
1912.06:106:12
2012.06:106:11
2112.06:106:10
2212.06:106:10
2312.06:106:09
2412.06:106:08
2512.06:106:07
2611.96:106:07
2711.96:106:06
2811.96:106:05
2911.96:106:04
3011.96:106:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.73 kWh/m².

For context, solar energy here swings from a low near 4.66 kWh/m² to a high of 6.31 kWh/m² in April across the year — September's 4.73 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.9Bright
44.8Bright
54.8Bright
64.8Bright
74.8Bright
84.8Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
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
284.6Bright
294.6Bright
304.5Bright
Planning a trip in September

Hazard calendar for Samut Prakan

In seasonPeak

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

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

Samut Prakan'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 Prakan?

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

3.0
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 Prakan.

What to pack for Samut Prakan in September

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

In September, Samut Prakan 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 Prakan in September

The nearest coast averages about 29°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 25 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
Feb28Tropical
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Samut Prakan 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 Prakan 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 Prakan 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 Prakan is worst in January — around 40 µg/m³ PM2.5 (poor), about 2.5× the cleanest month (August, 16 µg/m³).

Seasonal pattern from CAMS reanalysis, scaled to Samut Prakan's WHO annual average of 25.8 µg/m³.

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorJan 1539 µg/m³Aug 1016 µg/m³
PM2.5 (µg/m³)Level
Jan40Poor
Feb34Moderate
Mar24Moderate
Apr22Moderate
May19Moderate
Jun16Moderate
Jul16Moderate
Aug16Moderate
Sep21Moderate
Oct31Moderate
Nov35Poor
Dec36Poor
Location & terrain

Where is Samut Prakan?

Samut Prakan sits at 13.6°N, 100.6°E, 2 m above sea level, in Thailand. The nearest listed city is Bang Na, 9.0 km away.

Topography around Samut Prakan

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

Within 3 km, the terrain around Samut Prakan has only modest variations in elevation — a maximum elevation change of 13 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 39 m; within 80 km, large variations in elevation — a maximum elevation change of 874 m.

The land around Samut Prakan is covered by artificial surfaces (58%) within 3 km, artificial surfaces (43%) and water (33%) within 16 km, and water (33%), cropland (24%) and trees (20%) within 80 km.

3 km
13 m
16 km
39 m
80 km
874 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Bang Na 9.0 km · Phra Pradaeng 10 km · Thung Khru 10 km · Phra Khanong 12 km · Chong Nonsi 12 km · Yan Nawa 12 km · Khlong Toei 13 km · Rat Burana 14 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 Prakan (13.5976°, 100.5972°, elevation 2 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).