Champasak weather in September

In September, Champasak sees average daytime highs of 29°C and overnight lows near 23°C, with 406 mm of rain across 27.3 wet days and about 12.1 hours of daylight. It is the 10th-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 3% of the time in September, and the air most often feels oppressive.

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 Champasak's 9th-clearest and 11th-windiest month. For the whole year in context, see Champasak's year-round climate.

Daytime high
29°
10th warmest
Overnight low
23°
7th coldest
Rainfall
406 mm
27.3 wet days
Daylight
12 h 06 min
5:48 AM – 5:53 PM
Cloud cover
88%
9th clearest
Wind
4 km/h
11th windiest
Solar energy
3.86 kWh/m²
Travel score
3.2
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 Champasak reaches about 29°C in the afternoon and slips back to 23°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°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)
12923
22923
32923
42923
52923
62923
72923
82923
92923
102923
112823
122923
132923
142923
152923
162923
172923
182923
192923
202923
212923
222922
232922
242922
252922
262922
272922
282922
292922
302922

How September really feels in Champasak

Once humidity and wind are folded in, September averages 6 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
6
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.

Champasak weather by month

How September compares with the rest of the year at a glance. September is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 17°61.311.26.6
Feb31° / 19°71.411.55.8
Mar32° / 22°224.711.94.5
Apr32° / 23°5710.912.33.7
May31° / 23°14821.512.73.1
Jun30° / 23°24125.712.93.1
Jul29° / 23°40128.112.83.2
Aug28° / 23°41328.612.53.1
Sep29° / 23°40627.312.13.2
Oct29° / 22°28722.711.73.7
Nov29° / 20°881211.35.1
Dec29° / 18°193.711.16.5

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 (%)
1694
2694
3694
4595
5595
6595
7595
8595
9694
10694
11694
12694
13793
14793
15793
16892
17991
18991
191090
201090
211288
221288
231288
241387
251387
261387
271486
281585
291585
301585

Chance of precipitation in September

Any precipitation

Champasak gets around 406 mm of rain over 27.3 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 91% and peaks near 93% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
190
291
391
492
592
692
793
893
993
1093
1193
1293
1393
1492
1592
1692
1791
1891
1990
2090
2190
2289
2389
2489
2589
2689
2789
2889
2989
3089

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 93% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
10928
20928
30928
40937
50937
60937
70937
80937
90937
100937
110937
120937
130946
141936
151936
161936
171945
181945
191936
201936
211936
222926
232926
242926
252926
262926
272926
282926
292926
302935

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 5:47 AM to 5:49 AM, and sunset from 6:05 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:476:05
212.35:476:04
312.35:486:03
412.35:486:03
512.25:486:02
612.25:486:01
712.25:486:00
812.25:486:00
912.25:485:59
1012.25:485:58
1112.25:485:57
1212.15:485:56
1312.15:485:56
1412.15:485:55
1512.15:485:54
1612.15:485:53
1712.15:485:52
1812.15:485:52
1912.05:495:51
2012.05:495:50
2112.05:495:49
2212.05:495:48
2312.05:495:48
2412.05:495:47
2512.05:495:46
2611.95:495:45
2711.95:495:45
2811.95:495:44
2911.95:495:43
3011.95:495:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.86 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.86 kWh/m² to a high of 5.8 kWh/m² in March across the year — September's 3.86 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
13.9Moderate
23.9Moderate
33.9Moderate
43.8Moderate
53.8Moderate
63.8Moderate
73.8Moderate
83.8Moderate
93.8Moderate
103.8Moderate
113.8Moderate
123.8Moderate
133.8Moderate
143.8Moderate
153.8Moderate
163.8Moderate
173.8Moderate
183.8Moderate
193.8Moderate
203.8Moderate
213.9Moderate
223.9Moderate
233.9Moderate
243.9Moderate
253.9Moderate
264.0Moderate
274.0Moderate
284.0Moderate
294.0Bright
304.0Bright
Planning a trip in September

Hazard calendar for Champasak

In seasonPeak

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

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

Champasak's monsoon runs June–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 Champasak?

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

3.2
Sightseeing
8th-best month of the year
3.9
Beach & pool
10th-best month of the year

September is a weaker month for outdoor sightseeing in Champasak.

What to pack for Champasak in September

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

In September, Champasak sees daytime highs around 29°C and nights near 23°C. Pack light clothes and rain gear. About 27 days see rain.

light clothesrain gear

UV index in Champasak 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 Champasak peaks around August 14 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 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 14UV 14Dec 13UV 8
UV index (midday)Level
Jan10Very high
Feb9Very high
Mar10Extreme
Apr11Extreme
May12Extreme
Jun12Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Champasak 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 Champasak is worst in March — around 110 µg/m³ PM2.5 (unhealthy), about 11.5× the cleanest month (December, 10 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyModerateGoodMar 16103 µg/m³Dec 910 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb59Unhealthy
Mar110Unhealthy
Apr50Poor
May19Moderate
Jun14Moderate
Jul14Moderate
Aug13Moderate
Sep13Moderate
Oct13Moderate
Nov10Good
Dec10Good
Location & terrain

Where is Champasak?

Champasak sits at 14.9°N, 105.9°E, 0 m above sea level, in Laos. The nearest listed city is Pakse, 27 km away.

Ban LaongamPhibun MangsahanDet UdomSekongWarin ChamrapUbon RatchathaniKantharalak

Topography around Champasak

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

Within 3 km, the terrain around Champasak has only modest variations in elevation — a maximum elevation change of 17 m around an average of 96 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,353 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,628 m.

The land around Champasak is covered by cropland (39%) and water (32%) within 3 km, trees (57%) and cropland (27%) within 16 km, and trees (65%) and cropland (24%) within 80 km.

3 km
17 m
16 km
1,353 m
80 km
1,628 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Pakse 27 km · Ban Laongam 71 km · Phibun Mangsahan 80 km · Det Udom 86 km · Sekong 104 km · Warin Chamrap 114 km · Ubon Ratchathani 117 km · Kantharalak 135 km

Laos travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type A / B / C / E / F
230 V · 50 Hz
Prices
≈ 23% of US
price level, 2025
GDP per capita
$2,325
2025
Happiness
5.5 / 10
World Happiness, 2025
Safe drinking water
35%
of population, 2024
Road deaths
17.9
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 461
Religion
Buddhist 65%none 31%other/not stated 2%Christian 2%

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 Champasak (14.892°, 105.8779°, elevation 0 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). 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).