Sekong weather in September

In September, Sekong sees average daytime highs of 28°C and overnight lows near 22°C, with 341 mm of rain across 28.2 wet days and about 12.1 hours of daylight. It is the 9th-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 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 Sekong's 9th-clearest and 12th-windiest month. For the whole year in context, see Sekong's year-round climate.

Daytime high
28°
9th warmest
Overnight low
22°
7th coldest
Rainfall
341 mm
28.2 wet days
Daylight
12 h 06 min
5:45 AM – 5:50 PM
Cloud cover
86%
9th clearest
Wind
3 km/h
12th windiest
Solar energy
4.09 kWh/m²
Travel score
3.4
out of 10

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 Sekong reaches about 28°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 25°C and 30°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)
12822
22822
32822
42822
52822
62822
72822
82822
92822
102822
112822
122822
132822
142822
152822
162822
172822
182822
192822
202822
212821
222821
232821
242821
252821
262821
272821
282821
292821
302821

How September really feels in Sekong

Once humidity and wind are folded in, September averages 0 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
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Sekong weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 16°8211.26.9
Feb30° / 18°184.511.55.6
Mar32° / 20°7211.511.94.2
Apr32° / 22°13821.212.33.0
May30° / 22°27228.312.72.7
Jun29° / 22°27628.812.92.9
Jul28° / 22°35030.412.83.2
Aug28° / 22°35230.312.53.3
Sep28° / 22°34128.212.13.4
Oct28° / 20°18018.711.74.5
Nov28° / 19°687.511.36.1
Dec28° / 17°152.711.17.4

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 9% of September, with mostly cloudy or overcast conditions the remaining 88%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2892
3793
4793
5892
6892
7892
8892
9892
10991
11991
12991
131090
141090
151090
161288
171288
181288
191387
201387
211585
221684
231684
241684
251684
261882
271882
281981
292080
302080

Chance of precipitation in September

Any precipitation

Sekong gets around 341 mm of rain over 28.2 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 93% and peaks near 98% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
198
298
397
497
597
697
797
897
996
1096
1195
1295
1395
1494
1594
1693
1793
1892
1992
2092
2191
2291
2391
2490
2590
2689
2789
2888
2987
3087

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 95% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)
1199
2199
3199
4199
5298
6298
7298
8298
9298
10298
11298
12397
13397
14397
15397
16496
17496
18595
19694
20694
21793
22892
23892
24991
251090
261090
271189
281288
291387
301486

Wind in September

Winds average 3 km/h in September, the calmest month.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm

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 5:44 AM to 5:46 AM, and sunset from 6:02 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.35:446:02
212.35:446:01
312.35:446:00
412.35:446:00
512.25:445:59
612.25:445:58
712.25:445:57
812.25:445:56
912.25:445:56
1012.25:445:55
1112.25:455:54
1212.15:455:53
1312.15:455:52
1412.15:455:52
1512.15:455:51
1612.15:455:50
1712.15:455:49
1812.15:455:48
1912.05:455:48
2012.05:455:47
2112.05:455:46
2212.05:455:45
2312.05:455:44
2412.05:455:43
2512.05:465:43
2611.95:465:42
2711.95:465:41
2811.95:465:40
2911.95:465:40
3011.95:465:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.09 kWh/m².

For context, solar energy here swings from a low near 3.94 kWh/m² to a high of 6.04 kWh/m² in March across the year — September's 4.09 kWh/m² sits near the bottom.

012345151015202530
Solar energy (kWh/m²)Level
14.0Moderate
24.0Moderate
34.0Moderate
44.0Moderate
54.0Moderate
64.0Moderate
74.0Moderate
84.0Moderate
94.0Moderate
104.0Moderate
114.0Bright
124.0Bright
134.0Bright
144.0Bright
154.0Bright
164.0Bright
174.1Bright
184.1Bright
194.1Bright
204.1Bright
214.1Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.3Bright
274.3Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Sekong

In seasonPeak

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

Sekong'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 Sekong?

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

3.4
Sightseeing
7th-best month of the year
3.8
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Sekong.

What to pack for Sekong in September

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

In September, Sekong sees daytime highs around 28°C and nights near 22°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

UV index in Sekong 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 Sekong peaks around August 14 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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 14UV 8
UV index (midday)Level
Jan10Very high
Feb9Very high
Mar9Very high
Apr11Extreme
May11Extreme
Jun12Extreme
Jul13Extreme
Aug14Extreme
Sep12Extreme
Oct11Extreme
Nov9Very high
Dec8Very high

Air quality in Sekong 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 Sekong is worst in March — around 185 µg/m³ PM2.5 (very unhealthy), about 26.0× the cleanest month (November, 7 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyUnhealthyModerateGoodMar 17170 µg/m³Nov 197 µg/m³
PM2.5 (µg/m³)Level
Jan16Moderate
Feb63Unhealthy
Mar185Very unhealthy
Apr66Unhealthy
May16Moderate
Jun11Good
Jul11Good
Aug10Good
Sep9Good
Oct9Good
Nov7Good
Dec8Good
Location & terrain

Where is Sekong?

Sekong sits at 15.3°N, 106.7°E, 148 m above sea level, in Laos. The nearest listed city is Ban Laongam, 61 km away.

Ban LaongamPakseChampasakBà NàPhong ĐiềnHương TràHương ThủyHue

Topography around Sekong

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

Within 3 km, the terrain around Sekong has only modest variations in elevation — a maximum elevation change of 159 m around an average of 158 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,170 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,120 m.

The land around Sekong is covered by trees (60%) within 3 km, trees (83%) within 16 km, and trees (83%) within 80 km.

3 km
159 m
16 km
1,170 m
80 km
2,120 m
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Ban Laongam 61 km · Pakse 102 km · Champasak 104 km · Bà Nà 152 km · Phong Điền 154 km · Hương Trà 154 km · Hương Thủy 155 km · Hue 155 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 Sekong (15.3458°, 106.7237°, elevation 148 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).