Trashigang weather in September

In September, Trashigang sees average daytime highs of 22°C and overnight lows near 15°C, with 391 mm of rain across 28.7 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 4th-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 Trashigang's 9th-clearest and 10th-windiest month. For the whole year in context, see Trashigang's year-round climate.

Daytime high
22°
4th warmest
Overnight low
15°
9th coldest
Rainfall
391 mm
28.7 wet days
Daylight
12 h 12 min
5:43 AM – 5:53 PM
Cloud cover
83%
9th clearest
Wind
3 km/h
10th windiest
Solar energy
3.66 kWh/m²
Travel score
3.6
out of 10

Trashigang is city.

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 Trashigang reaches about 22°C in the afternoon and slips back to 15°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 1°C warmer than October.

10°15°20°25°151015202530
Avg high (°C)Avg low (°C)
12216
22216
32216
42216
52216
62216
72216
82216
92216
102216
112216
122216
132216
142216
152215
162215
172215
182215
192215
202215
212215
222215
232215
242215
252215
262214
272214
282214
292214
302214

Trashigang weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan13° / 358.710.54.0
Feb15° / 6312.2114.1
Mar17° / 12017.911.84.5
Apr19° / 10°2072312.64.2
May21° / 13°32027.913.33.9
Jun22° / 16°61029.713.73.4
Jul22° / 17°8713113.63.3
Aug23° / 17°61631133.3
Sep22° / 15°39128.712.23.6
Oct21° / 11°10811.211.36.4
Nov18° / 214.710.76.6
Dec15° / 245.810.35.0

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 11% of September, with mostly cloudy or overcast conditions the remaining 83%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1496
2595
3694
4694
5793
6892
7892
81090
91189
101288
111288
121387
131585
141585
151585
161585
171585
181684
191783
201783
211882
222080
232179
242377
252575
262872
272971
283268
293664
303862

Chance of precipitation in September

Any precipitation

Trashigang gets around 391 mm of rain over 28.7 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 94% and peaks near 99% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
199
299
399
499
599
699
799
899
999
1098
1198
1298
1398
1498
1598
1697
1797
1897
1996
2095
2194
2293
2392
2490
2589
2687
2785
2882
2980
3078

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. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1018811
2028711
3028810
403889
504879
604888
705887
806877
908866
1009856
11010855
12011845
13012844
14013834
15015823
16016813
17017812
18019792
19021772
20023761
21025741
22127711
23130681
24232651
25235630
26338590
27341560
28444520
29646480
30749440

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 5:36 AM to 5:50 AM, and sunset from 6:11 PM to 5:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.65:366:11
212.55:376:09
312.55:376:08
412.55:386:07
512.55:386:06
612.45:396:05
712.45:396:04
812.45:406:02
912.45:406:01
1012.35:416:00
1112.35:415:59
1212.35:415:58
1312.25:425:57
1412.25:425:55
1512.25:435:54
1612.25:435:53
1712.15:445:52
1812.15:445:50
1912.15:455:49
2012.05:455:48
2112.05:465:47
2212.05:465:46
2312.05:475:44
2411.95:475:43
2511.95:485:42
2611.95:485:41
2711.95:485:40
2811.85:495:39
2911.85:495:37
3011.85:505:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.66 kWh/m².

For context, solar energy here swings from a low near 3.16 kWh/m² to a high of 4.92 kWh/m² in April across the year — September's 3.66 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.5Moderate
23.5Moderate
33.6Moderate
43.6Moderate
53.6Moderate
63.6Moderate
73.6Moderate
83.6Moderate
93.6Moderate
103.6Moderate
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 Trashigang

In seasonPeak

None of Trashigang's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Trashigang's monsoon runs June–August, 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 Trashigang?

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

3.6
Sightseeing
9th-best month of the year
2.6
Beach & pool
2nd-best month of the year

September is a weaker month for outdoor sightseeing in Trashigang.

What to pack for Trashigang in September

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

In September, Trashigang sees daytime highs around 22°C and nights near 15°C. Pack rain gear. Worth having: light clothes. About 29 days see rain.

rain gearlight clothes

UV index in Trashigang 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 Trashigang peaks around July 13 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 11 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 highHighJul 13UV 14Jan 11UV 5
UV index (midday)Level
Jan5Moderate
Feb6High
Mar9Very high
Apr9Very high
May11Extreme
Jun13Extreme
Jul14Extreme
Aug12Extreme
Sep11Extreme
Oct8Very high
Nov6High
Dec5Moderate

Air quality in Trashigang 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 Trashigang 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 Trashigang?

Trashigang sits at 27.3°N, 91.6°E, 0 m above sea level, in Bhutan. The nearest listed city is Mongar, 32 km away.

MongarSamdrup JongkharJakarTrongsaTsirangPunakhaThimphuParo

Topography around Trashigang

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

Within 3 km, the terrain around Trashigang has very significant variations in elevation — a maximum elevation change of 1,730 m around an average of 1,273 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 3,540 m; within 80 km, extreme variations in elevation — a maximum elevation change of 6,299 m.

The land around Trashigang is covered by trees (63%) and grassland (35%) within 3 km, trees (79%) within 16 km, and trees (78%) within 80 km.

3 km
1,730 m
16 km
3,540 m
80 km
6,299 m
treesgrasslandcroplandartificial surfacesbare terrainsnow and icewatermoss and lichen
September weather nearby: Mongar 32 km · Samdrup Jongkhar 59 km · Jakar 83 km · Trongsa 105 km · Tsirang 146 km · Punakha 168 km · Thimphu 189 km · Paro 212 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 Trashigang (27.3331°, 91.5542°, 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).