Ban Khoan weather in September

In September, Ban Khoan sees average daytime highs of 31°C and overnight lows near 24°C, with 290 mm of rain across 24.1 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 10% 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 Khoan's 9th-clearest and 12th-windiest month. For the whole year in context, see Ban Khoan's year-round climate.

Daytime high
31°
5th warmest
Overnight low
24°
9th coldest
Rainfall
290 mm
24.1 wet days
Daylight
12 h 06 min
6:11 AM – 6:17 PM
Cloud cover
79%
9th clearest
Wind
3 km/h
12th windiest
Solar energy
4.3 kWh/m²
Travel score
2.8
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 Khoan 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 28°C and 34°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
163124
173124
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293123
303123

How September really feels in Ban Khoan

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 Khoan 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° / 14°212.510.97.6
Feb31° / 15°111.811.35.7
Mar34° / 18°344.311.93.8
Apr35° / 22°979.912.52.9
May33° / 24°23220.3132.6
Jun32° / 25°27225.313.22.3
Jul31° / 25°3902813.12.4
Aug31° / 24°39028.512.72.4
Sep31° / 24°29024.112.12.8
Oct31° / 22°12615.911.54.2
Nov29° / 19°405.3116.3
Dec27° / 16°242.910.88.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% 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 78%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11288
21288
31387
41387
51585
61585
71684
81684
91684
101783
111882
121882
131981
141981
152080
162179
172179
182278
192476
202575
212575
222773
232971
243070
253169
263268
273565
283664
293862
303961

Chance of precipitation in September

Any precipitation

Ban Khoan gets around 290 mm of rain over 24.1 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 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
587
687
786
886
985
1085
1184
1284
1383
1482
1582
1681
1780
1879
1978
2078
2177
2276
2375
2474
2573
2672
2771
2870
2970
3069

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 53% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
104060
204060
304159
404258
504357
604357
704456
804555
904654
1004753
1104852
1214950
1315049
1415148
1515346
1625345
1725444
1825543
1935641
2035740
2135839
2235938
2346036
2446234
2546333
2646531
2756629
2856728
2956926
3057025

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 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
14calm
24calm
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 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 6:07 AM to 6:14 AM, and sunset from 6:32 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.46:076:32
212.46:076:31
312.46:086:30
412.46:086:29
512.36:086:28
612.36:086:27
712.36:096:26
812.36:096:25
912.36:096:24
1012.26:096:23
1112.26:096:22
1212.26:106:21
1312.26:106:20
1412.26:106:19
1512.16:106:18
1612.16:116:17
1712.16:116:16
1812.16:116:15
1912.16:116:14
2012.06:116:14
2112.06:126:13
2212.06:126:12
2312.06:126:11
2412.06:126:10
2511.96:136:09
2611.96:136:08
2711.96:136:07
2811.96:136:06
2911.96:146:05
3011.86:146:04

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.3 kWh/m².

For context, solar energy here swings from a low near 4.04 kWh/m² to a high of 6.27 kWh/m² in April across the year — September's 4.3 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.2Bright
24.2Bright
34.2Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.4Bright
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 Khoan

In seasonPeak

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

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

Ban Khoan'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 Khoan?

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

2.8
Sightseeing
8th-best month of the year
4.2
Beach & pool
9th-best month of the year

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

What to pack for Ban Khoan in September

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

In September, Ban Khoan 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 Ban Khoan 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 Khoan 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 highHighJul 19UV 13Dec 20UV 7
UV index (midday)Level
Jan7High
Feb9Very high
Mar9Very high
Apr10Very high
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in Ban Khoan 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 Khoan is worst in April — around 156 µg/m³ PM2.5 (very unhealthy), about 12.0× the cleanest month (July, 13 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecModerateUnhealthyModerateApr 11150 µg/m³Jul 2313 µg/m³
PM2.5 (µg/m³)Level
Jan23Moderate
Feb40Poor
Mar128Unhealthy
Apr156Very unhealthy
May37Poor
Jun15Moderate
Jul13Moderate
Aug13Moderate
Sep13Moderate
Oct14Moderate
Nov15Moderate
Dec19Moderate
Location & terrain

Where is Ban Khoan?

Ban Khoan sits at 20.4°N, 100.1°E, 373 m above sea level, in Laos. The nearest listed city is Mae Sai, 24 km away.

Chiang RaiMöng YawngPhayaoDok Kham Tai

Topography around Ban Khoan

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

Within 3 km, the terrain around Ban Khoan has only modest variations in elevation — a maximum elevation change of 145 m around an average of 382 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 862 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,714 m.

The land around Ban Khoan is covered by trees (42%) and cropland (25%) within 3 km, trees (46%) and cropland (38%) within 16 km, and trees (81%) within 80 km.

3 km
145 m
16 km
862 m
80 km
1,714 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Mae Sai 24 km · Tachilek 24 km · Mae Chan 34 km · Ban Houakhoua 40 km · Chiang Rai 56 km · Möng Yawng 96 km · Phayao 131 km · Dok Kham Tai 132 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 Khoan (20.3501°, 100.0902°, elevation 373 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).