Mongar weather in September

In September, Mongar sees average daytime highs of 22°C and overnight lows near 16°C, with 496 mm of rain across 27.7 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 22°C through the month. The sky is clear or mostly clear about 5% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 36 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Mongar's 9th-clearest and 11th-windiest month. For the whole year in context, see Mongar's year-round climate.

Daytime high
22°
4th warmest
Overnight low
16°
9th coldest
Rainfall
496 mm
27.7 wet days
Daylight
12 h 12 min
5:45 AM – 5:54 PM
Cloud cover
84%
9th clearest
Wind
3 km/h
11th windiest
Solar energy
3.68 kWh/m²
Travel score
3.7
out of 10

Mongar is place in Mongar District, Bhutan.

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 22°C through the month.

A typical September day in Mongar reaches about 22°C in the afternoon and slips back to 16°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 24°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12317
22317
32317
42317
52316
62316
72316
82316
92316
102316
112316
122316
132316
142216
152216
162216
172215
182215
192215
202215
212215
222215
232215
242215
252215
262215
272214
282214
292214
302214

Mongar weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan13° / 8912.52.610.53.5
Feb14° / 17218.41.2113.2
Mar17° / 29325.4011.83.5
Apr19° / 10°41427.4012.63.6
May21° / 13°51629.1013.33.6
Jun22° / 16°79829.6013.73.4
Jul23° / 17°88431013.53.3
Aug23° / 17°57430.40133.4
Sep22° / 16°49627.7012.23.7
Oct21° / 11°19516.8011.35.6
Nov18° / 599010.76.0
Dec15° / 487.40.410.34.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 5% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 85%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2991
3991
4991
51090
61090
71189
81288
91288
101288
111387
121486
131486
141486
151486
161486
171387
181486
191486
201486
211585
221684
231684
241783
251981
262080
272278
282476
292575
302773

Chance of precipitation in September

Any precipitation

Mongar gets around 496 mm of rain over 27.7 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 92% 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
396
496
595
695
795
894
994
1093
1193
1293
1392
1492
1592
1692
1792
1892
1992
2091
2191
2291
2391
2490
2589
2689
2787
2886
2985
3083

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 76% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1017524
2027523
3027622
4027721
5037819
6047818
7048016
8058015
9068113
10078112
11078310
1208839
1309838
14010837
15011836
16012835
17013834
18014824
19015823
20017803
21018802
22120772
23123742
24125731
25227701
26230671
27333631
28336601
29439561
30541540

Wind in September

Winds average 3 km/h in September.

Across September, daily wind ranges from about 3 km/h on the calmest days to 3 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
13calm
23calm
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 36 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 48 minutes over September. Sunrise moves from 5:38 AM to 5:51 AM, and sunset from 6:12 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:386:12
212.55:386:11
312.55:396:10
412.55:396:08
512.55:406:07
612.45:406:06
712.45:406:05
812.45:416:04
912.45:416:03
1012.35:426:01
1112.35:426:00
1212.35:435:59
1312.25:435:58
1412.25:445:57
1512.25:445:55
1612.25:455:54
1712.15:455:53
1812.15:465:52
1912.15:465:51
2012.05:465:49
2112.05:475:48
2212.05:475:47
2312.05:485:46
2411.95:485:45
2511.95:495:43
2611.95:495:42
2711.95:505:41
2811.85:505:40
2911.85:515:39
3011.85:515:38

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.68 kWh/m².

For context, solar energy here swings from a low near 3.19 kWh/m² to a high of 4.93 kWh/m² in April across the year — September's 3.68 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.6Moderate
83.7Moderate
93.7Moderate
103.7Moderate
113.7Moderate
123.7Moderate
133.7Moderate
143.7Moderate
153.7Moderate
163.7Moderate
173.7Moderate
183.7Moderate
193.7Moderate
203.7Moderate
213.7Moderate
223.7Moderate
233.7Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.8Moderate
283.9Moderate
293.9Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Mongar

In seasonPeak

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

Mongar's monsoon runs April–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 Mongar?

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

3.7
Sightseeing
4th-best month of the year
2.8
Beach & pool
2nd-best month of the year

September is a weaker month for outdoor sightseeing in Mongar.

What to pack for Mongar in September

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

In September, Mongar sees daytime highs around 22°C and nights near 16°C. Pack rain gear. Worth having: light clothes. About 28 days see rain.

rain gearlight clothes

UV index in Mongar 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 Mongar peaks around July 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 5 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 11UV 13Jan 1UV 5
UV index (midday)Level
Jan5Moderate
Feb5Moderate
Mar8Very high
Apr9Very high
May10Very high
Jun13Extreme
Jul13Extreme
Aug11Extreme
Sep11Extreme
Oct7Very high
Nov6High
Dec5Moderate

Air quality in Mongar 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 Mongar is worst in February — around 73 µg/m³ PM2.5 (unhealthy), about 3.7× the cleanest month (July, 20 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorFeb 1672 µg/m³Jul 1820 µg/m³
PM2.5 (µg/m³)Level
Jan64Unhealthy
Feb73Unhealthy
Mar67Unhealthy
Apr55Poor
May36Poor
Jun27Moderate
Jul20Moderate
Aug24Moderate
Sep28Moderate
Oct36Poor
Nov45Poor
Dec54Poor
Location & terrain

Where is Mongar?

Mongar sits at 27.3°N, 91.2°E, 0 m above sea level, in Bhutan. The nearest listed city is Trashigang, 32 km away.

TrashigangJakarSamdrup JongkharTrongsaTsirangPunakhaThimphuParo

Topography around Mongar

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

Within 3 km, the terrain around Mongar has very significant variations in elevation — a maximum elevation change of 1,572 m around an average of 1,668 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,853 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,706 m.

The land around Mongar is covered by trees (78%) within 3 km, trees (89%) within 16 km, and trees (84%) within 80 km.

3 km
1,572 m
16 km
2,853 m
80 km
5,706 m
treesgrasslandcroplandartificial surfacesbare terrainmoss and lichen
September weather nearby: Trashigang 32 km · Jakar 57 km · Samdrup Jongkhar 59 km · Trongsa 77 km · Tsirang 114 km · Punakha 139 km · Thimphu 159 km · Paro 181 km

Bhutan travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / D / F / G / M
230 V · 50 Hz
Prices
≈ 23% of US
price level, 2025
GDP per capita
$4,493
2025
Happiness
5.1 / 10
World Happiness, 2018
Safe drinking water
66%
of population, 2024
Homicide rate
2.5
per 100k, 2020
Road deaths
16.2
per 100k/yr, 2019
Income group
Lower middle
World Bank
English
Low
EF EPI 473
Religion
Lamaistic Buddhist 75%Indian- and Nepali-influenced Hinduism 22%other 3%

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 Mongar (27.2747°, 91.2396°, elevation 0 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).