Det Udom weather in September

In September, Det Udom sees average daytime highs of 31°C and overnight lows near 25°C, with 277 mm of rain across 26.1 wet days and about 12.1 hours of daylight. It is the 9th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 4% 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 Det Udom's 9th-clearest and 12th-windiest month. For the whole year in context, see Det Udom's year-round climate.

Daytime high
31°
9th warmest
Overnight low
25°
7th coldest
Rainfall
277 mm
26.1 wet days
Daylight
12 h 06 min
5:52 AM – 5:56 PM
Cloud cover
87%
9th clearest
Wind
7 km/h
12th windiest
Solar energy
4.3 kWh/m²
Travel score
2.6
out of 10

Det Udom is town in Ubon Ratchathani 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 31°C through the month.

A typical September day in Det Udom reaches about 31°C in the afternoon and slips back to 25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°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)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263124
273124
283124
293124
303124

How September really feels in Det Udom

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.

Det Udom weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 19°41.311.25.5
Feb33° / 21°91.911.54.4
Mar35° / 24°326.211.93.0
Apr35° / 26°7612.212.32.3
May34° / 26°17522.412.72.1
Jun33° / 26°19023.212.92.3
Jul32° / 25°24426.412.82.4
Aug31° / 25°27327.412.52.5
Sep31° / 25°27726.112.12.6
Oct31° / 24°1301611.73.8
Nov31° / 22°354.711.35.1
Dec30° / 20°71.411.15.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% 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 (%)
1793
2793
3793
4793
5793
6793
7793
8793
9892
10892
11892
12892
13892
14991
15991
16991
171288
181288
191288
201387
211486
221486
231486
241585
251684
261684
271882
281882
291882
301882

Chance of precipitation in September

Any precipitation

Det Udom gets around 277 mm of rain over 26.1 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 87% and peaks near 90% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
188
289
389
489
589
689
789
889
990
1090
1190
1290
1390
1489
1589
1689
1788
1887
1987
2086
2186
2285
2384
2484
2583
2683
2782
2881
2981
3080

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 80% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
101486
201486
301486
401486
501486
601486
701486
801585
901585
1001585
1101684
1201684
1301783
1401882
1501882
1601981
1701981
1802080
1902080
2002179
2102278
2212277
2312376
2412475
2512574
2612574
2712673
2812772
2922771
3022870

Wind in September

Winds average 7 km/h in September, the calmest month.

Across September, daily wind ranges from about 6 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
18calm
28calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:51 AM to 5:53 AM, and sunset from 6:08 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:516:08
212.35:516:07
312.35:516:07
412.35:516:06
512.25:516:05
612.25:516:04
712.25:516:04
812.25:516:03
912.25:516:02
1012.25:516:01
1112.25:516:00
1212.15:516:00
1312.15:515:59
1412.15:515:58
1512.15:515:57
1612.15:525:56
1712.15:525:56
1812.15:525:55
1912.05:525:54
2012.05:525:53
2112.05:525:52
2212.05:525:52
2312.05:525:51
2412.05:525:50
2512.05:525:49
2611.95:525:49
2711.95:525:48
2811.95:525:47
2911.95:525:46
3011.95:535:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.3 kWh/m² to a high of 6.13 kWh/m² in April across the year — September's 4.3 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.2Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Det Udom

In seasonPeak

In September, Det Udom sits inside its monsoon season. The full year is below, with each hazard's peak months called out.

Det Udom's monsoon runs May–October, when most of the year's rain falls.

Monsoon
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Det Udom?

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

2.6
Sightseeing
7th-best month of the year
3.9
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Det Udom.

What to pack for Det Udom in September

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

In September, Det Udom sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 26 days see rain.

light clothesrain gear

UV index in Det Udom in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Det Udom peaks around August 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 12 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 13UV 14Dec 12UV 8
UV index (midday)Level
Jan9Very high
Feb10Extreme
Mar10Extreme
Apr11Extreme
May12Extreme
Jun12Extreme
Jul13Extreme
Aug14Extreme
Sep11Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Det Udom 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 Det Udom is worst in March — around 61 µg/m³ PM2.5 (unhealthy), about 4.2× the cleanest month (December, 15 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorPoorModerateMar 1759 µg/m³Dec 1315 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb42Poor
Mar61Unhealthy
Apr43Poor
May26Moderate
Jun20Moderate
Jul21Moderate
Aug21Moderate
Sep24Moderate
Oct24Moderate
Nov18Moderate
Dec15Moderate
Location & terrain

Where is Det Udom?

Det Udom sits at 14.9°N, 105.1°E, 137 m above sea level, in Thailand. The nearest listed city is Warin Chamrap, 39 km away.

Amnat Charoen

Topography around Det Udom

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

Within 3 km, the terrain around Det Udom has only modest variations in elevation — a maximum elevation change of 30 m around an average of 133 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 50 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,360 m.

The land around Det Udom is covered by trees (37%) and cropland (37%) within 3 km, cropland (68%) and trees (25%) within 16 km, and cropland (51%) and trees (41%) within 80 km.

3 km
30 m
16 km
50 m
80 km
1,360 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Warin Chamrap 39 km · Phibun Mangsahan 41 km · Ubon Ratchathani 44 km · Kantharalak 55 km · Pakse 81 km · Si Sa Ket 84 km · Champasak 86 km · Amnat Charoen 116 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 Det Udom (14.906°, 105.0784°, elevation 137 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. 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).