Muang Xay weather in September

In September, Muang Xay sees average daytime highs of 28°C and overnight lows near 21°C, with 199 mm of rain across 22.6 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 5th-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 11% 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 Muang Xay's 9th-clearest and 12th-windiest month. For the whole year in context, see Muang Xay's year-round climate.

Daytime high
28°
6th warmest
Overnight low
21°
8th coldest
Rainfall
199 mm
22.6 wet days
Daylight
12 h 06 min
6:03 AM – 6:10 PM
Cloud cover
78%
9th clearest
Wind
4 km/h
12th windiest
Solar energy
4.38 kWh/m²
Travel score
4.1
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 Muang Xay reaches about 28°C in the afternoon and slips back to 21°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 about 1°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12822
22822
32822
42822
52822
62822
72821
82821
92821
102821
112821
122821
132821
142821
152821
162821
172821
182821
192821
202821
212821
222821
232821
242821
252821
262821
272821
282820
292820
302820

How September really feels in Muang Xay

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.

Muang Xay weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan24° / 12°324.310.98.2
Feb26° / 13°203.811.38.0
Mar29° / 16°658.611.96.2
Apr30° / 19°14515.312.54.6
May30° / 21°23822.4133.6
Jun29° / 22°24825.613.23.1
Jul28° / 22°33128.613.13.1
Aug28° / 22°33428.112.73.3
Sep28° / 21°19922.612.14.1
Oct27° / 19°8814.211.55.9
Nov25° / 16°396.6117.6
Dec23° / 13°304.610.88.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 11% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% 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
31288
41387
51387
61486
71684
81684
91684
101882
111882
121981
131981
141981
152179
162179
172377
182377
192476
202476
212773
222773
232872
242971
253169
263169
273367
283466
293664
303664

Chance of precipitation in September

Any precipitation

Muang Xay gets around 199 mm of rain over 22.6 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 75% and peaks near 86% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
186
285
385
484
583
682
782
881
980
1079
1178
1278
1377
1476
1576
1675
1774
1874
1973
2072
2172
2271
2370
2469
2568
2667
2766
2864
2963
3062

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 56% of days. Sticky, muggy-or-worse air turns up on roughly 93% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1002080
2012178
3012376
4012475
5012673
6012871
7022969
8023167
9023266
10023464
11033562
12033661
13133759
14143857
15143956
16153955
17154054
18264052
19264151
20274150
21274249
22284347
23384446
24394544
253104642
263114739
273114937
283125035
293135232
303145330

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 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 5:59 AM to 6:06 AM, and sunset from 6:24 PM to 5:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:596:24
212.46:006:23
312.46:006:22
412.46:006:21
512.36:006:21
612.36:016:20
712.36:016:19
812.36:016:18
912.36:016:17
1012.26:016:16
1112.26:026:15
1212.26:026:14
1312.26:026:13
1412.26:026:12
1512.16:036:11
1612.16:036:10
1712.16:036:09
1812.16:036:08
1912.16:046:07
2012.06:046:06
2112.06:046:05
2212.06:046:04
2312.06:056:03
2412.06:056:02
2511.96:056:01
2611.96:056:00
2711.96:065:59
2811.96:065:58
2911.96:065:57
3011.86:065:56

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.38 kWh/m².

For context, solar energy here swings from a low near 3.76 kWh/m² to a high of 5.76 kWh/m² in April across the year — September's 4.38 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.3Bright
114.3Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Muang Xay

In seasonPeak

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

Muang Xay'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 Muang Xay?

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

4.1
Sightseeing
8th-best month of the year
4.6
Beach & pool
9th-best month of the year

September is a reasonable time to visit Muang Xay for sightseeing.

What to pack for Muang Xay in September

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

In September, Muang Xay sees daytime highs around 28°C and nights near 21°C. Pack light clothes and rain gear. About 23 days see rain.

light clothesrain gear

UV index in Muang Xay 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 Muang Xay peaks around June 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highVery highExtremeVery highHighJun 22UV 13Dec 19UV 7
UV index (midday)Level
Jan7Very high
Feb9Very high
Mar10Extreme
Apr9Very high
May11Extreme
Jun13Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec7High

Air quality in Muang Xay 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 Muang Xay is worst in April — around 583 µg/m³ PM2.5 (very unhealthy), about 75.7× the cleanest month (September, 8 µg/m³).

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

0306090120150180210240270300330360390420450480510540JanFebMarAprMayJunJulAugSepOctNovDecModerateVery unhealthyGoodApr 15530 µg/m³Sep 118 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb24Moderate
Mar210Very unhealthy
Apr583Very unhealthy
May74Unhealthy
Jun10Good
Jul8Good
Aug8Good
Sep8Good
Oct8Good
Nov8Good
Dec10Good
Location & terrain

Where is Muang Xay?

Muang Xay sits at 20.7°N, 102.0°E, 652 m above sea level, in Laos. The nearest listed city is Nong Khiaw, 67 km away.

Nong KhiawLuang NamthaLuang PrabangMuang SingDien Bien PhuBan HouakhouaMöng YawngMuang Phônsavan

Topography around Muang Xay

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

Within 3 km, the terrain around Muang Xay has significant variations in elevation — a maximum elevation change of 372 m around an average of 683 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,283 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,540 m.

The land around Muang Xay is covered by trees (41%) and cropland (22%) within 3 km, trees (66%) and grassland (27%) within 16 km, and trees (85%) within 80 km.

3 km
372 m
16 km
1,283 m
80 km
1,540 m
treesgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Nong Khiaw 67 km · Luang Namtha 67 km · Luang Prabang 91 km · Muang Sing 103 km · Dien Bien Phu 133 km · Ban Houakhoua 167 km · Möng Yawng 177 km · Muang Phônsavan 187 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 Muang Xay (20.6923°, 101.9837°, elevation 652 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).