Borikhan weather in September

In September, Borikhan sees average daytime highs of 31°C and overnight lows near 24°C, with 328 mm of rain across 24.3 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 4th-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 12% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Borikhan's 8th-clearest and 12th-windiest month. For the whole year in context, see Borikhan's year-round climate.

Daytime high
31°
5th warmest
Overnight low
24°
9th coldest
Rainfall
328 mm
24.3 wet days
Daylight
12 h 06 min
5:56 AM – 6:03 PM
Cloud cover
78%
8th clearest
Wind
4 km/h
12th windiest
Solar energy
4.27 kWh/m²
Travel score
3.0
out of 10

Borikhan is town in Bolikhamsai Province, Laos.

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 Borikhan reaches about 31°C in the afternoon and slips back to 24°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 33°C. Set against its neighbours, September runs about 1°C warmer than August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13024
23024
33024
43024
53024
63024
73024
83024
93024
103024
113024
123024
133024
143024
153124
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in Borikhan

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.

Borikhan weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 15°101.6118.1
Feb29° / 17°19311.46.5
Mar32° / 20°427.211.94.8
Apr33° / 23°8414.512.43.3
May32° / 24°29526.212.92.5
Jun31° / 24°43328.913.12.4
Jul30° / 24°56030.3132.6
Aug30° / 24°53330.412.62.6
Sep31° / 24°32824.312.13.0
Oct31° / 22°8510.611.64.4
Nov30° / 19°172.611.16.1
Dec28° / 16°7110.97.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 12% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 75%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1991
2991
31090
41090
51090
61288
71387
81585
91585
101684
111783
121882
132080
142179
152377
162377
172674
182872
192872
203169
213268
223367
233565
243763
253862
263961
274060
284258
294258
304456

Chance of precipitation in September

Any precipitation

Borikhan gets around 328 mm of rain over 24.3 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 80% and peaks near 96% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
196
296
395
494
594
693
792
891
990
1089
1188
1287
1386
1485
1583
1682
1780
1879
1977
2075
2174
2272
2370
2469
2567
2665
2764
2862
2960
3058

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 71% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1001189
2001288
3001387
4001387
5001486
6001585
7001684
8001684
9011782
10011881
11011980
12012079
13022177
14022276
15022375
16032473
17032572
18042670
19042769
20052867
21053065
22053164
23163360
24163459
25173656
26173755
27183952
28184051
29194247
301104345

Wind in September

Winds average 4 km/h in September, the calmest month.

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 24 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 30 minutes over September. Sunrise moves from 5:54 AM to 5:59 AM, and sunset from 6:16 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:546:16
212.45:546:15
312.35:546:14
412.35:546:13
512.35:546:12
612.35:556:12
712.35:556:11
812.25:556:10
912.25:556:09
1012.25:556:08
1112.25:556:07
1212.25:566:06
1312.25:566:05
1412.15:566:04
1512.15:566:03
1612.15:566:03
1712.15:566:02
1812.15:576:01
1912.05:576:00
2012.05:575:59
2112.05:575:58
2212.05:575:57
2312.05:585:56
2412.05:585:55
2511.95:585:54
2611.95:585:53
2711.95:585:53
2811.95:585:52
2911.95:595:51
3011.95:595:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.27 kWh/m².

For context, solar energy here swings from a low near 3.7 kWh/m² to a high of 5.8 kWh/m² in April across the year — September's 4.27 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
13.8Moderate
23.9Moderate
33.9Moderate
43.9Moderate
53.9Moderate
63.9Moderate
73.9Moderate
84.0Moderate
94.0Moderate
104.0Bright
114.1Bright
124.1Bright
134.1Bright
144.2Bright
154.2Bright
164.3Bright
174.3Bright
184.3Bright
194.4Bright
204.4Bright
214.5Bright
224.5Bright
234.6Bright
244.6Bright
254.6Bright
264.7Bright
274.7Bright
284.7Bright
294.8Bright
304.8Bright
Planning a trip in September

Hazard calendar for Borikhan

In seasonPeak

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

Borikhan's monsoon runs May–September, 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 Borikhan?

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

3.0
Sightseeing
8th-best month of the year
4.4
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Borikhan.

What to pack for Borikhan in September

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

In September, Borikhan sees daytime highs around 31°C and nights near 24°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

UV index in Borikhan 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 Borikhan peaks around August 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highAug 10UV 13Dec 15UV 7
UV index (midday)Level
Jan8Very high
Feb9Very high
Mar11Extreme
Apr10Very high
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep12Extreme
Oct10Extreme
Nov8Very high
Dec7Very high

Air quality in Borikhan 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 Borikhan is worst in April — around 200 µg/m³ PM2.5 (very unhealthy), about 20.2× the cleanest month (November, 10 µg/m³).

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

0306090120150180210JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyVery unhealthyModerateGoodModerateApr 11192 µg/m³Nov 1210 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb42Poor
Mar158Very unhealthy
Apr200Very unhealthy
May29Moderate
Jun12Good
Jul12Good
Aug11Good
Sep10Good
Oct11Good
Nov10Good
Dec13Moderate
Location & terrain

Where is Borikhan?

Borikhan sits at 18.6°N, 103.7°E, 165 m above sea level, in Laos. The nearest listed city is Pakxan, 20 km away.

SekaPhon CharoenBan DungMuang PhônsavanSawang Daen DinNong KhaiVientiane

Topography around Borikhan

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

Within 3 km, the terrain around Borikhan has only modest variations in elevation — a maximum elevation change of 220 m around an average of 183 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 599 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,671 m.

The land around Borikhan is covered by trees (63%) and cropland (20%) within 3 km, trees (79%) within 16 km, and trees (84%) within 80 km.

3 km
220 m
16 km
599 m
80 km
2,671 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Pakxan 20 km · Seka 75 km · Phon Charoen 83 km · Ban Dung 108 km · Muang Phônsavan 113 km · Sawang Daen Din 124 km · Nong Khai 129 km · Vientiane 136 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 Borikhan (18.5629°, 103.7267°, elevation 165 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).