Chanthaburi weather in September

In September, Chanthaburi sees average daytime highs of 29°C and overnight lows near 26°C, with 363 mm of rain across 28.8 wet days and about 12.1 hours of daylight. It is the 12th-warmest and 3rd-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 1% 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 Chanthaburi's 11th-clearest and 7th-windiest month. For the whole year in context, see Chanthaburi's year-round climate.

Daytime high
29°
12th warmest
Overnight low
26°
6th coldest
Rainfall
363 mm
28.8 wet days
Daylight
12 h 06 min
6:04 AM – 6:08 PM
Cloud cover
90%
11th clearest
Wind
10 km/h
7th windiest
Solar energy
4.32 kWh/m²
Travel score
2.9
out of 10

Chanthaburi is town in Chanthaburi province, Thailand.

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 29°C through the month.

A typical September day in Chanthaburi reaches about 29°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 28°C and 30°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)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192926
202926
212926
222926
232926
242926
252926
262926
272926
282926
292926
302926

How September really feels in Chanthaburi

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.

Chanthaburi weather by month

How September compares with the rest of the year at a glance. September is the 12th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°296.311.36.1
Feb29° / 25°338.211.65.7
Mar30° / 26°8515.111.94.7
Apr30° / 27°12218.812.33.8
May30° / 27°32028.212.62.8
Jun30° / 27°38428.412.72.8
Jul29° / 27°36929.612.72.8
Aug29° / 27°32829.212.42.9
Sep29° / 26°36328.812.12.9
Oct30° / 26°2382311.73.5
Nov30° / 25°46811.45.2
Dec30° / 24°163.211.36.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 95%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1595
2595
3595
4397
5397
6397
7397
8397
9397
10496
11496
12496
13496
14496
15496
16496
17595
18694
19694
20694
21793
22793
23793
24892
25892
26892
27793
28793
29991
30991

Chance of precipitation in September

Any precipitation

Chanthaburi gets around 363 mm of rain over 28.8 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 96% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
195
295
396
496
596
696
796
896
996
1096
1196
1296
1396
1496
1596
1696
1796
1896
1996
2096
2196
2296
2396
2496
2595
2695
2795
2895
2995
3095

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 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1298
2298
3298
4298
5298
6298
7298
8298
9298
10298
11298
12298
13298
14298
15298
16298
17298
18298
19298
20298
21298
22298
23298
24298
25298
26397
27397
28397
29496
30496

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 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
112calm
212calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
199calm
209calm
219calm
229calm
239calm
249calm
258calm
268calm
278calm
288calm
298calm
308calm

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 6:04 AM to 6:04 AM, and sunset from 6:19 PM to 5:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.26:046:19
212.26:046:18
312.26:046:17
412.26:046:17
512.26:046:16
612.26:046:15
712.26:046:15
812.26:046:14
912.26:046:13
1012.16:046:12
1112.16:046:12
1212.16:046:11
1312.16:046:10
1412.16:046:09
1512.16:046:09
1612.16:046:08
1712.16:046:07
1812.06:046:07
1912.06:046:06
2012.06:046:05
2112.06:046:04
2212.06:046:04
2312.06:046:03
2412.06:046:02
2512.06:046:01
2611.96:046:01
2711.96:046:00
2811.96:045:59
2911.96:045:59
3011.96:045:58

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.32 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.32 kWh/m² to a high of 5.89 kWh/m² in April across the year — September's 4.32 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Chanthaburi

In seasonPeak

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

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

Chanthaburi'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 Chanthaburi?

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

2.9
Sightseeing
8th-best month of the year
3.7
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Chanthaburi.

What to pack for Chanthaburi in September

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

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

light clothesrain gear

Sea temperature near Chanthaburi 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 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
May31Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Tropical

UV index in Chanthaburi 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 Chanthaburi peaks around August 16 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 16UV 14Nov 23UV 9
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar13Extreme
Apr13Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec9Very high

Air quality in Chanthaburi 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 Chanthaburi is worst in February — around 32 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (August, 14 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateFeb 1631 µg/m³Aug 1714 µg/m³
PM2.5 (µg/m³)Level
Jan26Moderate
Feb32Moderate
Mar27Moderate
Apr22Moderate
May16Moderate
Jun14Moderate
Jul15Moderate
Aug14Moderate
Sep15Moderate
Oct18Moderate
Nov16Moderate
Dec16Moderate
Location & terrain

Where is Chanthaburi?

Chanthaburi sits at 12.6°N, 102.1°E, 7 m above sea level, in Thailand. The nearest listed city is Tha Mai, 11 km away.

Topography around Chanthaburi

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

Within 3 km, the terrain around Chanthaburi has only modest variations in elevation — a maximum elevation change of 38 m around an average of 8 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 937 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,596 m.

The land around Chanthaburi is covered by trees (45%) and artificial surfaces (33%) within 3 km, trees (64%) within 16 km, and trees (58%) and water (29%) within 80 km.

3 km
38 m
16 km
937 m
80 km
1,596 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Tha Mai 11 km · Laem Sing 15 km · Khao Saming 46 km · Klaeng 53 km · Laem Ngop 58 km · Trat 60 km · Pailin 61 km · Ko Chang 66 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 Chanthaburi (12.6096°, 102.1045°, elevation 7 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).