Ubon Ratchathani weather in September

In September, Ubon Ratchathani sees average daytime highs of 31°C and overnight lows near 25°C, with 273 mm of rain across 25.6 wet days and about 12.1 hours of daylight. It is the 8th-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 Ubon Ratchathani's 9th-clearest and 12th-windiest month. For the whole year in context, see Ubon Ratchathani's year-round climate.

Daytime high
31°
8th warmest
Overnight low
25°
7th coldest
Rainfall
273 mm
25.6 wet days
Daylight
12 h 06 min
5:52 AM – 5:57 PM
Cloud cover
86%
9th clearest
Wind
7 km/h
12th windiest
Solar energy
4.35 kWh/m²
Travel score
2.6
out of 10

Ubon Ratchathani is city in Ubon Ratchathani province, Thailand.

Density
4,219/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 31°C through the month.

A typical September day in Ubon Ratchathani reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°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
263125
273125
283125
293125
303125

How September really feels in Ubon Ratchathani

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.

Ubon Ratchathani weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan31° / 19°51.411.25.8
Feb33° / 21°101.911.54.5
Mar35° / 24°356.311.93.0
Apr35° / 26°811312.32.2
May34° / 26°18122.412.72.1
Jun33° / 26°19423.312.92.3
Jul32° / 25°23226.312.82.4
Aug31° / 25°2702712.52.5
Sep31° / 25°27325.612.12.6
Oct31° / 24°1241511.73.9
Nov31° / 22°314.711.35.2
Dec30° / 19°61.311.16.1

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 9% of September, with mostly cloudy or overcast conditions the remaining 88%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2892
3892
4892
5892
6892
7892
8892
9892
10991
11991
121090
131090
141090
151189
161288
171387
181486
191486
201585
211684
221684
231684
241882
251882
261882
271882
281882
292080
302179

Chance of precipitation in September

Any precipitation

Ubon Ratchathani gets around 273 mm of rain over 25.6 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 85% and peaks near 89% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
189
289
388
488
588
688
788
888
988
1088
1188
1288
1387
1487
1587
1687
1786
1886
1985
2084
2184
2283
2382
2481
2581
2680
2779
2878
2977
3075

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 82% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
101189
201189
301189
401189
501189
601189
701189
801189
901189
1001288
1101288
1201387
1301387
1401486
1501585
1601684
1701783
1801882
1901981
2002080
2112178
2212277
2312376
2412475
2512574
2612673
2722771
2822969
2923068
3033166

Wind in September

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

Across September, daily wind ranges from about 7 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
38calm
48calm
58calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:54 AM, and sunset from 6:09 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:516:09
212.35:516:09
312.35:516:08
412.35:526:07
512.25:526:06
612.25:526:05
712.25:526:05
812.25:526:04
912.25:526:03
1012.25:526:02
1112.25:526:01
1212.15:526:01
1312.15:526:00
1412.15:525:59
1512.15:525:58
1612.15:525:57
1712.15:525:57
1812.15:535:56
1912.05:535:55
2012.05:535:54
2112.05:535:53
2212.05:535:53
2312.05:535:52
2412.05:535:51
2512.05:535:50
2611.95:535:49
2711.95:535:49
2811.95:535:48
2911.95:535:47
3011.95:545:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.35 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.35 kWh/m² to a high of 6.13 kWh/m² in April across the year — September's 4.35 kWh/m² sits near the bottom.

024151015202530
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
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Ubon Ratchathani

In seasonPeak

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

Ubon Ratchathani'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 Ubon Ratchathani?

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
4.0
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Ubon Ratchathani.

What to pack for Ubon Ratchathani in September

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

In September, Ubon Ratchathani 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 Ubon Ratchathani 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 Ubon Ratchathani peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 10 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 12UV 13Dec 10UV 8
UV index (midday)Level
Jan9Very high
Feb10Very high
Mar11Extreme
Apr11Extreme
May11Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct11Extreme
Nov8Very high
Dec8Very high

Air quality in Ubon Ratchathani 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 Ubon Ratchathani 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 Ubon Ratchathani?

Ubon Ratchathani sits at 15.2°N, 104.8°E, 125 m above sea level, in Thailand. The nearest listed city is Warin Chamrap, 5.0 km away.

YasothonPakse

Topography around Ubon Ratchathani

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

Within 3 km, the terrain around Ubon Ratchathani has only modest variations in elevation — a maximum elevation change of 29 m around an average of 120 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 52 m; within 80 km, significant variations in elevation — a maximum elevation change of 458 m.

The land around Ubon Ratchathani is covered by artificial surfaces (47%) and trees (33%) within 3 km, trees (46%) and cropland (36%) within 16 km, and cropland (68%) and trees (26%) within 80 km.

3 km
29 m
16 km
52 m
80 km
458 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Warin Chamrap 5.0 km · Phibun Mangsahan 41 km · Det Udom 44 km · Si Sa Ket 57 km · Kantharalak 70 km · Amnat Charoen 73 km · Yasothon 97 km · Pakse 103 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 Ubon Ratchathani (15.2384°, 104.8487°, elevation 125 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).