Bang Saphan weather in September

In September, Bang Saphan sees average daytime highs of 29°C and overnight lows near 25°C, with 204 mm of rain across 25.7 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 29°C through the month. The sky is clear or mostly clear about 2% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Bang Saphan's 9th-clearest and 5th-windiest month. For the whole year in context, see Bang Saphan's year-round climate.

Daytime high
29°
7th warmest
Overnight low
25°
7th coldest
Rainfall
204 mm
25.7 wet days
Daylight
12 h 06 min
6:14 AM – 6:18 PM
Cloud cover
88%
9th clearest
Wind
11 km/h
5th windiest
Solar energy
4.42 kWh/m²
Travel score
3.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in Bang Saphan reaches about 29°C in the afternoon and slips back to 25°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 31°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13025
23025
33025
43025
53025
63025
73025
82925
92925
102925
112925
122925
132925
142925
152925
162925
172925
182925
192925
202925
212925
222925
232925
242925
252925
262925
272925
282925
292925
302925

How September really feels in Bang Saphan

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.

Bang Saphan 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
Jan28° / 23°445.711.46.9
Feb29° / 24°235.111.66.4
Mar30° / 25°7310.811.95.2
Apr31° / 26°941612.23.9
May31° / 26°16924.512.53.0
Jun30° / 26°15923.112.63.2
Jul30° / 25°18325.112.63.2
Aug30° / 25°1802512.43.2
Sep29° / 25°20425.712.13.1
Oct29° / 25°23825.511.73.5
Nov29° / 25°10612.411.55.2
Dec28° / 24°425.811.46.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 5% of September, with mostly cloudy or overcast conditions the remaining 93%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1793
2793
3694
4694
5694
6694
7595
8595
9595
10595
11595
12595
13595
14595
15595
16694
17793
18793
19892
20892
21892
22892
23991
24991
25991
26991
271090
281090
291090
301090

Chance of precipitation in September

Any precipitation

Bang Saphan gets around 204 mm of rain over 25.7 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 86% and peaks near 90% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
183
283
383
483
582
682
782
883
983
1083
1184
1284
1385
1485
1586
1686
1787
1887
1988
2088
2189
2289
2389
2489
2589
2689
2789
2889
2990
3090

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
14852
24852
34951
45050
55149
65248
75248
85347
95347
105347
115347
125347
135347
145347
155248
165248
175149
185050
195050
204951
214852
224852
234753
244753
254753
264654
274654
284654
294654
304654

Wind in September

Winds average 11 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
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012calm
1112calm
1212calm
1312calm
1412calm
1512calm
1612calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2410calm
2510calm
2610calm
2710calm
2810calm
299calm
309calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 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 18 minutes over September. Sunrise moves from 6:15 AM to 6:14 AM, and sunset from 6:28 PM to 6:09 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:156:28
212.26:156:28
312.26:156:27
412.26:156:26
512.26:156:26
612.26:156:25
712.26:156:24
812.16:156:24
912.16:156:23
1012.16:156:22
1112.16:156:22
1212.16:156:21
1312.16:156:20
1412.16:156:19
1512.16:146:19
1612.16:146:18
1712.16:146:17
1812.06:146:17
1912.06:146:16
2012.06:146:15
2112.06:146:15
2212.06:146:14
2312.06:146:13
2412.06:146:13
2512.06:146:12
2612.06:146:11
2711.96:146:11
2811.96:146:10
2911.96:146:09
3011.96:146:09

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.42 kWh/m².

For context, solar energy here swings from a low near 4.28 kWh/m² to a high of 6.12 kWh/m² in April across the year — September's 4.42 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Bang Saphan

In seasonPeak

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

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

Bang Saphan's rainy season runs May–October, when most of the year's rain falls.

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

Is September a good time to visit Bang Saphan?

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

3.1
Sightseeing
11th-best month of the year
4.1
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Bang Saphan.

What to pack for Bang Saphan in September

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

In September, Bang Saphan sees daytime highs around 29°C and nights near 25°C. Pack light clothes and rain gear. About 26 days see rain.

light clothesrain gear

Sea temperature near Bang Saphan 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 16 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 Bang Saphan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bang Saphan peaks around August 18 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 18UV 14Nov 23UV 9
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep13Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Bang Saphan 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 Bang Saphan is worst in January — around 21 µg/m³ PM2.5 (moderate), about 2.0× the cleanest month (September, 11 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateJan 2121 µg/m³Sep 1611 µg/m³
PM2.5 (µg/m³)Level
Jan21Moderate
Feb20Moderate
Mar19Moderate
Apr19Moderate
May14Moderate
Jun12Moderate
Jul14Moderate
Aug12Good
Sep11Good
Oct11Good
Nov15Moderate
Dec17Moderate
Location & terrain

Where is Bang Saphan?

Bang Saphan sits at 11.2°N, 99.5°E, 12 m above sea level, in Thailand. The nearest listed city is Prachuap Khiri Khan, 74 km away.

Kui BuriSam Roi YotKo TaoPran BuriLang SuanHua Hin

Topography around Bang Saphan

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

Within 3 km, the terrain around Bang Saphan has only modest variations in elevation — a maximum elevation change of 130 m around an average of 12 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 441 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,215 m.

The land around Bang Saphan is covered by trees (62%) within 3 km, trees (51%) and water (43%) within 16 km, and trees (62%) and water (36%) within 80 km.

3 km
130 m
16 km
441 m
80 km
1,215 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Prachuap Khiri Khan 74 km · Chumphon 88 km · Kui Buri 104 km · Sam Roi Yot 124 km · Ko Tao 130 km · Pran Buri 137 km · Lang Suan 149 km · Hua Hin 159 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 Bang Saphan (11.2126°, 99.5117°, elevation 12 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).