Muang Phônsavan weather in September

In September, Muang Phônsavan sees average daytime highs of 26°C and overnight lows near 19°C, with 173 mm of rain across 21 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 9% of the time in September, and the air most often feels muggy.

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 Phônsavan's 9th-clearest and 12th-windiest month. For the whole year in context, see Muang Phônsavan's year-round climate.

Daytime high
26°
6th warmest
Overnight low
19°
8th coldest
Rainfall
173 mm
21 wet days
Daylight
12 h 06 min
5:58 AM – 6:05 PM
Cloud cover
79%
9th clearest
Wind
5 km/h
12th windiest
Solar energy
4.24 kWh/m²
Travel score
4.7
out of 10

Muang Phônsavan is town in 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 26°C through the month.

A typical September day in Muang Phônsavan reaches about 26°C in the afternoon and slips back to 19°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 24°C and 28°C. Set against its neighbours, September runs on par with August and about 1°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12620
22620
32620
42620
52620
62620
72620
82620
92619
102619
112619
122619
132619
142619
152619
162619
172619
182619
192619
202619
212619
222619
232619
242619
252618
262618
272618
282618
292618
302618

Muang Phônsavan weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan23° / 10°203.3118.1
Feb25° / 11°183.811.38.2
Mar26° / 14°6310.611.96.8
Apr27° / 17°11718.912.45.2
May28° / 19°16525.212.94.0
Jun27° / 21°1852613.23.7
Jul27° / 20°25327.813.13.6
Aug26° / 20°27528.612.73.6
Sep26° / 19°1732112.14.7
Oct25° / 17°6810.911.66.6
Nov24° / 13°204.511.18.0
Dec22° / 10°142.410.88.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 9% 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 (%)
11090
21189
31189
41189
51387
61387
71387
81486
91684
101684
111783
121783
131981
141981
152080
162179
172377
182377
192575
202674
212773
222971
233070
243268
253268
263466
273466
283565
293763
303763

Chance of precipitation in September

Any precipitation

Muang Phônsavan gets around 173 mm of rain over 21 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 70% 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
286
385
484
583
682
781
880
979
1078
1176
1275
1374
1473
1571
1670
1768
1867
1966
2064
2163
2262
2360
2459
2558
2656
2755
2854
2953
3052

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 81% of days. Sticky, muggy-or-worse air turns up on roughly 83% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1002962
2003952
3003952
4004942
5005932
6006922
7006922
8007912
9018892
10019882
11019882
120110872
130111862
140212851
150212851
160213841
170314821
180315811
190316801
200317791
210419761
220420751
230422731
240523711
250525691
260527671
271529641
281630621
291632601
301633591

Wind in September

Winds average 5 km/h in September, the calmest month.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:55 AM to 6:01 AM, and sunset from 6:19 PM to 5:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:556:19
212.45:556:18
312.45:566:17
412.35:566:16
512.35:566:15
612.35:566:14
712.35:576:13
812.35:576:12
912.25:576:11
1012.25:576:10
1112.25:576:10
1212.25:586:09
1312.25:586:08
1412.15:586:07
1512.15:586:06
1612.15:586:05
1712.15:586:04
1812.15:596:03
1912.15:596:02
2012.05:596:01
2112.05:596:00
2212.05:595:59
2312.06:005:58
2412.06:005:57
2511.96:005:56
2611.96:005:55
2711.96:015:55
2811.96:015:54
2911.96:015:53
3011.86:015:52

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.24 kWh/m².

For context, solar energy here swings from a low near 3.92 kWh/m² to a high of 5.63 kWh/m² in April across the year — September's 4.24 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.1Bright
44.1Bright
54.1Bright
64.1Bright
74.1Bright
84.1Bright
94.1Bright
104.1Bright
114.1Bright
124.1Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Muang Phônsavan

In seasonPeak

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

Muang Phônsavan'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 Phônsavan?

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

4.7
Sightseeing
8th-best month of the year
4.6
Beach & pool
8th-best month of the year

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

What to pack for Muang Phônsavan in September

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

In September, Muang Phônsavan sees daytime highs around 26°C and nights near 19°C. Pack rain gear. Worth having: light clothes. About 21 days see rain.

rain gearlight clothes

UV index in Muang Phônsavan 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 Phônsavan peaks around June 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 highJun 20UV 14Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar11Extreme
Apr10Extreme
May12Extreme
Jun14Extreme
Jul13Extreme
Aug14Extreme
Sep11Extreme
Oct11Extreme
Nov8Very high
Dec7Very high

Air quality in Muang Phônsavan 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 Phônsavan is worst in April — around 227 µg/m³ PM2.5 (very unhealthy), about 32.9× the cleanest month (August, 7 µg/m³).

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

0306090120150180210240JanFebMarAprMayJunJulAugSepOctNovDecModerateVery unhealthyGoodApr 10223 µg/m³Aug 247 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb33Moderate
Mar206Very unhealthy
Apr227Very unhealthy
May22Moderate
Jun8Good
Jul7Good
Aug7Good
Sep7Good
Oct8Good
Nov7Good
Dec9Good
Location & terrain

Where is Muang Phônsavan?

Muang Phônsavan sits at 19.4°N, 103.2°E, 1,106 m above sea level, in Laos. The nearest listed city is Vang Vieng, 98 km away.

Vang ViengBorikhanLuang PrabangPakxanNong KhiawXam NuaBản Na HỷVieng Xai

Topography around Muang Phônsavan

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

Within 3 km, the terrain around Muang Phônsavan has only modest variations in elevation — a maximum elevation change of 229 m around an average of 1,111 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 903 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,599 m.

The land around Muang Phônsavan is covered by grassland (36%), cropland (27%) and artificial surfaces (26%) within 3 km, trees (45%) and grassland (35%) within 16 km, and trees (82%) within 80 km.

3 km
229 m
16 km
903 m
80 km
2,599 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Vang Vieng 98 km · Borikhan 113 km · Luang Prabang 119 km · Pakxan 127 km · Nong Khiaw 139 km · Xam Nua 140 km · Bản Na Hỷ 141 km · Vieng Xai 152 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 Phônsavan (19.4494°, 103.1917°, elevation 1,106 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).