Trongsa weather in September

In September, Trongsa sees average daytime highs of 16°C and overnight lows near 9°C, with 368 mm of precipitation across 29.2 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 16°C through the month. The sky is clear or mostly clear about 1% of the time in September, and the air most often feels dry.

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 Trongsa's 9th-clearest and 10th-windiest month. For the whole year in context, see Trongsa's year-round climate.

Daytime high: 16°; 4th warmest
Overnight low: 9°; 9th coldest
Precipitation: 368 mm; 29.2 wet days
Daylight: 12 h 12 min; 5:47 AM – 5:57 PM
Cloud cover: 87%; 9th clearest
Wind: 3 km/h; 10th windiest
Solar energy: 3.8 kWh/m²
Travel score: 2.5; out of 10

Trongsa is city.

Founded: 1644

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Trongsa year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 16°C through the month.

A typical September day in Trongsa reaches about 16°C in the afternoon and slips back to 9°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 13°C and 18°C. Set against its neighbours, September runs about 1°C cooler than August and about 3°C warmer than October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	16	15	15	15	15	15	15	15	15	15	15	15
Avg low (°C)	10	10	10	10	9	9	9	9	9	9	9	9	9	9	9	9	8	8	8	8	8	8	8	8	8	7	7	7	7	7

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	9
12	16	9
13	16	9
14	16	9
15	16	9
16	16	9
17	16	8
18	16	8
19	16	8
20	15	8
21	15	8
22	15	8
23	15	8
24	15	8
25	15	8
26	15	7
27	15	7
28	15	7
29	15	7
30	15	7

How September really feels in Trongsa

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

heat index over the day's high

Days feeling ≤ 0°C

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.

Trongsa 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	4° / -7°	51	12	11.5	10.5	0.0
Feb	5° / -5°	93	16.9	14.5	11	0.1
Mar	8° / -2°	185	26.7	17.8	11.8	0.8
Apr	11° / 2°	195	28.3	7.8	12.6	1.6
May	14° / 5°	282	30.4	0.8	13.3	2.2
Jun	16° / 9°	517	30	0.1	13.7	2.5
Jul	16° / 11°	700	31	0	13.6	2.6
Aug	17° / 10°	504	31	0	13	2.6
Sep	16° / 9°	368	29.2	0.1	12.2	2.5
Oct	13° / 4°	150	23.3	1.7	11.3	2.5
Nov	10° / -1°	56	15.3	5.9	10.6	1.8
Dec	7° / -4°	39	10.6	7.7	10.3	0.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 4% of September, with mostly cloudy or overcast conditions the remaining 96%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	3	4	4	4	5	5	6	6	7	8	10	11	13	14
Cloudier (%)	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	97	96	96	96	95	95	94	94	93	92	90	89	87	86

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	3	97
18	4	96
19	4	96
20	4	96
21	5	95
22	5	95
23	6	94
24	6	94
25	7	93
26	8	92
27	10	90
28	11	89
29	13	87
30	14	86

Chance of precipitation in September

Any precipitation

Trongsa gets around 368 mm of rain and snow over 29.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 97% and peaks near 100% on the wettest days, and about 0 day brings snow. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	100	100	99	99	99	99	99	99	99	99	98	98	98	98	98	98	98	98	98	97	97	96	96	95	95	94	93	93	92	91

	Rain chance (%)
1	100
2	100
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	98
12	98
13	98
14	98
15	98
16	98
17	98
18	98
19	98
20	97
21	97
22	96
23	96
24	95
25	95
26	94
27	93
28	93
29	92
30	91

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3	3
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	3	calm
2	3	calm
3	3	calm
4	3	calm
5	3	calm
6	3	calm
7	3	calm
8	3	calm
9	3	calm
10	3	calm
11	3	calm
12	3	calm
13	3	calm
14	3	calm
15	3	calm
16	3	calm
17	3	calm
18	3	calm
19	3	calm
20	3	calm
21	3	calm
22	3	calm
23	3	calm
24	3	calm
25	3	calm
26	3	calm
27	3	calm
28	3	calm
29	3	calm
30	3	calm

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 5:40 AM to 5:54 AM, and sunset from 6:15 PM to 5:40 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.6	12.5	12.5	12.5	12.5	12.4	12.4	12.4	12.4	12.3	12.3	12.3	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9	11.8	11.8	11.8
Sunrise (AM)	5:40	5:41	5:41	5:42	5:42	5:43	5:43	5:44	5:44	5:45	5:45	5:46	5:46	5:47	5:47	5:47	5:48	5:48	5:49	5:49	5:50	5:50	5:51	5:51	5:52	5:52	5:53	5:53	5:54	5:54
Sunset (PM)	6:15	6:14	6:13	6:11	6:10	6:09	6:08	6:07	6:06	6:04	6:03	6:02	6:01	6:00	5:58	5:57	5:56	5:55	5:53	5:52	5:51	5:50	5:49	5:47	5:46	5:45	5:44	5:43	5:42	5:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.6	5:40	6:15
2	12.5	5:41	6:14
3	12.5	5:41	6:13
4	12.5	5:42	6:11
5	12.5	5:42	6:10
6	12.4	5:43	6:09
7	12.4	5:43	6:08
8	12.4	5:44	6:07
9	12.4	5:44	6:06
10	12.3	5:45	6:04
11	12.3	5:45	6:03
12	12.3	5:46	6:02
13	12.2	5:46	6:01
14	12.2	5:47	6:00
15	12.2	5:47	5:58
16	12.2	5:47	5:57
17	12.1	5:48	5:56
18	12.1	5:48	5:55
19	12.1	5:49	5:53
20	12.0	5:49	5:52
21	12.0	5:50	5:51
22	12.0	5:50	5:50
23	12.0	5:51	5:49
24	11.9	5:51	5:47
25	11.9	5:52	5:46
26	11.9	5:52	5:45
27	11.9	5:53	5:44
28	11.8	5:53	5:43
29	11.8	5:54	5:42
30	11.8	5:54	5:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 3.8 kWh/m².

For context, solar energy here swings from a low near 3.17 kWh/m² to a high of 5.2 kWh/m² in April across the year — September's 3.8 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.8	3.9	3.9
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	3.8	Moderate
2	3.8	Moderate
3	3.8	Moderate
4	3.8	Moderate
5	3.8	Moderate
6	3.8	Moderate
7	3.8	Moderate
8	3.8	Moderate
9	3.8	Moderate
10	3.8	Moderate
11	3.8	Moderate
12	3.8	Moderate
13	3.8	Moderate
14	3.8	Moderate
15	3.8	Moderate
16	3.8	Moderate
17	3.8	Moderate
18	3.8	Moderate
19	3.8	Moderate
20	3.8	Moderate
21	3.8	Moderate
22	3.8	Moderate
23	3.8	Moderate
24	3.8	Moderate
25	3.8	Moderate
26	3.8	Moderate
27	3.8	Moderate
28	3.8	Moderate
29	3.9	Moderate
30	3.9	Moderate

Planning a trip in September

Hazard calendar for Trongsa

In seasonPeak

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

Trongsa's monsoon runs June–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 Trongsa?

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

2.5

Sightseeing

3rd-best month of the year

—

Beach & pool

never really warm enough

September is a weaker month for outdoor sightseeing in Trongsa.

What to pack for Trongsa in September

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

In September, Trongsa sees daytime highs around 16°C and nights near 9°C. Pack rain gear. Worth having: a warm layer. About 29 days see rain.

rain geara warm layer

UV index in Trongsa in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Trongsa peaks around July 12 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 5 (high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	5	7	11	12	14	15	15	13	13	10	7	5
Level	High	High	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	High

	UV index (midday)	Level
Jan	5	High
Feb	7	High
Mar	11	Extreme
Apr	12	Extreme
May	14	Extreme
Jun	15	Extreme
Jul	15	Extreme
Aug	13	Extreme
Sep	13	Extreme
Oct	10	Very high
Nov	7	Very high
Dec	5	High

Location & terrain

Where is Trongsa?

Trongsa sits at 27.5°N, 90.5°E, 0 m above sea level, in Bhutan. The nearest listed city is Jakar, 25 km away.

Topography around Trongsa

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

Within 3 km, the terrain around Trongsa has very significant variations in elevation — a maximum elevation change of 1,567 m around an average of 2,399 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 3,264 m; within 80 km, extreme variations in elevation — a maximum elevation change of 7,311 m.

The land around Trongsa is covered by trees (81%) within 3 km, trees (92%) within 16 km, and trees (74%) within 80 km.

3 km

1,567 m

trees 81%

16 km

3,264 m

trees 92%

80 km

7,311 m

trees 74%

treesgrasslandartificial surfacesbare terrainsnow and icemoss and lichen

← August Trongsa year-round climate October →Best places to visit in September

September weather nearby: Jakar 25 km · Punakha 63 km · Tsirang 66 km · Mongar 77 km · Thimphu 85 km · Trashigang 105 km · Paro 108 km · Samdrup Jongkhar 126 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

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 Trongsa (27.5026°, 90.5072°, 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. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	9
12	16	9
13	16	9
14	16	9
15	16	9
16	16	9
17	16	8
18	16	8
19	16	8
20	15	8
21	15	8
22	15	8
23	15	8
24	15	8
25	15	8
26	15	7
27	15	7
28	15	7
29	15	7
30	15	7

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	3	97
18	4	96
19	4	96
20	4	96
21	5	95
22	5	95
23	6	94
24	6	94
25	7	93
26	8	92
27	10	90
28	11	89
29	13	87
30	14	86

	Rain chance (%)
1	100
2	100
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	98
12	98
13	98
14	98
15	98
16	98
17	98
18	98
19	98
20	97
21	97
22	96
23	96
24	95
25	95
26	94
27	93
28	93
29	92
30	91

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	9
12	16	9
13	16	9
14	16	9
15	16	9
16	16	9
17	16	8
18	16	8
19	16	8
20	15	8
21	15	8
22	15	8
23	15	8
24	15	8
25	15	8
26	15	7
27	15	7
28	15	7
29	15	7
30	15	7

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	3	97
18	4	96
19	4	96
20	4	96
21	5	95
22	5	95
23	6	94
24	6	94
25	7	93
26	8	92
27	10	90
28	11	89
29	13	87
30	14	86

	Rain chance (%)
1	100
2	100
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	98
12	98
13	98
14	98
15	98
16	98
17	98
18	98
19	98
20	97
21	97
22	96
23	96
24	95
25	95
26	94
27	93
28	93
29	92
30	91

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100

	Avg high (°C)	Avg low (°C)
1	16	10
2	16	10
3	16	10
4	16	10
5	16	9
6	16	9
7	16	9
8	16	9
9	16	9
10	16	9
11	16	9
12	16	9
13	16	9
14	16	9
15	16	9
16	16	9
17	16	8
18	16	8
19	16	8
20	15	8
21	15	8
22	15	8
23	15	8
24	15	8
25	15	8
26	15	7
27	15	7
28	15	7
29	15	7
30	15	7

	Clearer (%)	Cloudier (%)
1	2	98
2	2	98
3	2	98
4	2	98
5	2	98
6	2	98
7	2	98
8	2	98
9	2	98
10	2	98
11	2	98
12	2	98
13	2	98
14	2	98
15	2	98
16	2	98
17	3	97
18	4	96
19	4	96
20	4	96
21	5	95
22	5	95
23	6	94
24	6	94
25	7	93
26	8	92
27	10	90
28	11	89
29	13	87
30	14	86

	Rain chance (%)
1	100
2	100
3	99
4	99
5	99
6	99
7	99
8	99
9	99
10	99
11	98
12	98
13	98
14	98
15	98
16	98
17	98
18	98
19	98
20	97
21	97
22	96
23	96
24	95
25	95
26	94
27	93
28	93
29	92
30	91

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100