Chumphon weather in September

In September, Chumphon sees average daytime highs of 28°C and overnight lows near 26°C, with 160 mm of rain across 23.8 wet days and about 12.1 hours of daylight. It is the 7th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 3% of the time in September, and the air most often feels oppressive.

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 Chumphon's 9th-clearest and 5th-windiest month. For the whole year in context, see Chumphon's year-round climate.

Daytime high
28°
7th warmest
Overnight low
26°
5th coldest
Rainfall
160 mm
23.8 wet days
Daylight
12 h 06 min
6:16 AM – 6:19 PM
Cloud cover
86%
9th clearest
Wind
16 km/h
5th windiest
Solar energy
4.41 kWh/m²
Travel score
3.7
out of 10

Chumphon is town in Chumphon province, Thailand.

Density
2,646/km²
people per km²

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 28°C through the month.

A typical September day in Chumphon reaches about 28°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 29°C. Set against its neighbours, September runs on par with August and on par with October.

20°23°25°28°30°151015202530
Avg high (°C)Avg low (°C)
12926
22926
32826
42826
52826
62826
72826
82826
92826
102826
112826
122826
132826
142826
152826
162826
172826
182826
192826
202826
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825

How September really feels in Chumphon

Once humidity and wind are folded in, September averages 28 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
28
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.

Chumphon weather by month

How September compares with the rest of the year at a glance. September is the 7th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 25°688.511.56.9
Feb28° / 25°326.511.77.0
Mar29° / 26°849.711.95.9
Apr30° / 27°8713.212.24.8
May30° / 27°12421.712.53.7
Jun29° / 26°11220.312.63.8
Jul29° / 26°12021.312.63.9
Aug29° / 26°12921.812.33.9
Sep28° / 26°16023.812.13.7
Oct28° / 25°24325.111.84.1
Nov28° / 26°19817.211.55.2
Dec27° / 25°948.811.46.6

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 6% of September, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2892
3892
4892
5793
6793
7793
8793
9793
10793
11793
12892
13892
14892
15892
161090
171090
181189
191189
201189
211189
221189
231189
241189
251189
261288
271288
281189
291189
301189

Chance of precipitation in September

Any precipitation

Chumphon gets around 160 mm of rain over 23.8 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 80% and peaks near 84% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
173
273
374
474
575
675
776
877
977
1078
1178
1279
1379
1480
1580
1681
1781
1882
1982
2082
2183
2283
2383
2483
2583
2683
2783
2883
2983
3084

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 54% 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
55050
65149
75248
85248
95347
105347
115347
125446
135446
145446
155545
165545
175545
185545
195545
205545
215545
225545
235545
245644
255644
265743
275842
285842
295941
306040

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2914light breeze
3014light breeze

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 6:17 AM to 6:15 AM, and sunset from 6:29 PM to 6:10 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:176:29
212.26:176:28
312.26:176:28
412.26:176:27
512.26:176:27
612.26:176:26
712.16:176:25
812.16:166:25
912.16:166:24
1012.16:166:23
1112.16:166:23
1212.16:166:22
1312.16:166:21
1412.16:166:21
1512.16:166:20
1612.16:166:19
1712.06:166:19
1812.06:166:18
1912.06:166:17
2012.06:166:17
2112.06:166:16
2212.06:156:15
2312.06:156:15
2412.06:156:14
2512.06:156:13
2612.06:156:13
2711.96:156:12
2811.96:156:11
2911.96:156:11
3011.96:156:10

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.41 kWh/m².

For context, solar energy here swings from a low near 4.15 kWh/m² to a high of 6.01 kWh/m² in March across the year — September's 4.41 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.3Bright
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 Chumphon

In seasonPeak

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

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

Chumphon'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 September a good time to visit Chumphon?

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

3.7
Sightseeing
11th-best month of the year
4.4
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Chumphon.

What to pack for Chumphon in September

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

In September, Chumphon sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

Sea temperature near Chumphon 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 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
Nov28Tropical
Dec28Warm

UV index in Chumphon 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 Chumphon peaks around August 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 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 20UV 14Jan 1UV 9
UV index (midday)Level
Jan9Very high
Feb11Extreme
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep13Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in Chumphon 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 Chumphon is worst in March — around 21 µg/m³ PM2.5 (moderate), about 1.8× the cleanest month (September, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateMar 1421 µg/m³Sep 1412 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb20Moderate
Mar21Moderate
Apr20Moderate
May15Moderate
Jun13Moderate
Jul14Moderate
Aug12Good
Sep12Good
Oct12Good
Nov14Moderate
Dec14Moderate
Location & terrain

Where is Chumphon?

Chumphon sits at 10.5°N, 99.2°E, 8 m above sea level, in Thailand. The nearest listed city is Lang Suan, 62 km away.

Ko Pha-nganKo SamuiSurat Thani

Topography around Chumphon

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

Within 3 km, the terrain around Chumphon has only modest variations in elevation — a maximum elevation change of 34 m around an average of 7 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 306 m; within 80 km, large variations in elevation — a maximum elevation change of 1,039 m.

The land around Chumphon is covered by trees (64%) and artificial surfaces (23%) within 3 km, trees (68%) and water (20%) within 16 km, and trees (54%) and water (43%) within 80 km.

3 km
34 m
16 km
306 m
80 km
1,039 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Lang Suan 62 km · Ranong 84 km · Ko Tao 85 km · Bang Saphan 88 km · Kawthaung 89 km · Ko Pha-ngan 124 km · Ko Samui 135 km · Surat Thani 152 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 Chumphon (10.4957°, 99.1797°, elevation 8 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).