Ban Houakhoua weather in September

In September, Ban Houakhoua sees average daytime highs of 31°C and overnight lows near 23°C, with 245 mm of rain across 24.2 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 3rd-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 8% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Ban Houakhoua's 9th-clearest and 12th-windiest month. For the whole year in context, see Ban Houakhoua's year-round climate.

Daytime high
31°
5th warmest
Overnight low
23°
8th coldest
Rainfall
245 mm
24.2 wet days
Daylight
12 h 06 min
6:09 AM – 6:16 PM
Cloud cover
79%
9th clearest
Wind
4 km/h
12th windiest
Solar energy
4.28 kWh/m²
Travel score
3.0
out of 10

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 Ban Houakhoua reaches about 31°C in the afternoon and slips back to 23°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°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)
13124
23124
33124
43124
53124
63124
73124
83124
93124
103124
113124
123124
133124
143124
153124
163123
173123
183123
193123
203123
213123
223123
233123
243123
253123
263123
273123
283123
293123
303123

How September really feels in Ban Houakhoua

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.

Ban Houakhoua weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 15°222.810.97.9
Feb30° / 16°121.811.36.2
Mar33° / 19°374.811.94.3
Apr34° / 22°999.612.43.2
May33° / 24°21519.312.92.8
Jun32° / 25°23524.813.22.5
Jul31° / 24°3532813.12.6
Aug30° / 24°36328.412.72.6
Sep31° / 23°24524.212.13.0
Oct30° / 22°10615.111.54.4
Nov29° / 18°395.4116.5
Dec27° / 15°233.110.88.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% 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 79%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11090
21288
31288
41387
51387
61486
71585
81585
91585
101783
111783
121783
131783
141882
151981
161981
172080
182179
192278
202377
212476
222476
232773
242773
252872
263070
273268
283466
293565
303763

Chance of precipitation in September

Any precipitation

Ban Houakhoua gets around 245 mm of rain over 24.2 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 81% 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
389
488
588
687
787
886
986
1085
1185
1284
1384
1483
1582
1682
1781
1880
1979
2078
2177
2276
2375
2474
2573
2672
2771
2870
2969
3068

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 79% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1008020
2008020
3008020
4008020
5008020
6008020
7017920
8017920
9017920
10018019
11018019
12028018
13028018
14028117
15038017
16038116
17048016
18048016
19057916
20057916
21067915
22067915
23167914
24177814
25177913
26187912
27187912
28197911
291107811
301107910

Wind in September

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

Across September, daily wind ranges from about 3 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
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
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 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 6:06 AM to 6:12 AM, and sunset from 6:30 PM to 6:03 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:066:30
212.46:066:29
312.46:066:28
412.36:066:27
512.36:076:26
612.36:076:25
712.36:076:25
812.36:076:24
912.36:086:23
1012.26:086:22
1112.26:086:21
1212.26:086:20
1312.26:086:19
1412.26:096:18
1512.16:096:17
1612.16:096:16
1712.16:096:15
1812.16:106:14
1912.16:106:13
2012.06:106:12
2112.06:106:11
2212.06:106:10
2312.06:116:09
2412.06:116:08
2511.96:116:07
2611.96:116:06
2711.96:126:05
2811.96:126:04
2911.96:126:04
3011.86:126:03

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.28 kWh/m².

For context, solar energy here swings from a low near 3.94 kWh/m² to a high of 6.22 kWh/m² in April across the year — September's 4.28 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Ban Houakhoua

In seasonPeak

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

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

Ban Houakhoua's monsoon runs May–September, 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 Ban Houakhoua?

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
4.3
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Ban Houakhoua.

What to pack for Ban Houakhoua in September

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

In September, Ban Houakhoua sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. About 24 days see rain.

light clothesrain gear

UV index in Ban Houakhoua 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 Ban Houakhoua peaks around July 19 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highJul 19UV 13Dec 20UV 7
UV index (midday)Level
Jan7Very high
Feb9Very high
Mar9Very high
Apr10Very high
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Ban Houakhoua 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 Ban Houakhoua is worst in April — around 385 µg/m³ PM2.5 (very unhealthy), about 41.4× the cleanest month (October, 9 µg/m³).

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

0306090120150180210240270300330360JanFebMarAprMayJunJulAugSepOctNovDecModerateVery unhealthyModerateGoodApr 14355 µg/m³Oct 209 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb28Moderate
Mar191Very unhealthy
Apr385Very unhealthy
May37Poor
Jun13Moderate
Jul11Good
Aug11Good
Sep10Good
Oct9Good
Nov10Good
Dec12Good
Location & terrain

Where is Ban Houakhoua?

Ban Houakhoua sits at 20.2°N, 100.5°E, 361 m above sea level, in Laos. The nearest listed city is Ban Khoan, 40 km away.

Mae SaiMae ChanTachilekChiang RaiMöng YawngLuang NamthaMuang Sing

Topography around Ban Houakhoua

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

Within 3 km, the terrain around Ban Houakhoua has only modest variations in elevation — a maximum elevation change of 199 m around an average of 373 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 991 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,558 m.

The land around Ban Houakhoua is covered by cropland (38%) and trees (36%) within 3 km, trees (67%) and cropland (22%) within 16 km, and trees (82%) within 80 km.

3 km
199 m
16 km
991 m
80 km
1,558 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ban Khoan 40 km · Mae Sai 64 km · Mae Chan 64 km · Tachilek 64 km · Chiang Rai 75 km · Möng Yawng 104 km · Luang Namtha 126 km · Muang Sing 128 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 Ban Houakhoua (20.2467°, 100.454°, elevation 361 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).