Thị Trấn Trùng Khánh weather in September

In September, Thị Trấn Trùng Khánh sees average daytime highs of 29°C and overnight lows near 22°C, with 151 mm of rain across 16.8 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 30°C in the first days to 28°C by the end. The sky is clear or mostly clear about 21% of the time in September, and the air most often feels oppressive.

Daylight stretches from about 12 h 30 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Thị Trấn Trùng Khánh's 4th-clearest and 11th-windiest month. For the whole year in context, see Thị Trấn Trùng Khánh's year-round climate.

Daytime high
29°
4th warmest
Overnight low
22°
9th coldest
Rainfall
151 mm
16.8 wet days
Daylight
12 h 06 min
5:44 AM – 5:52 PM
Cloud cover
66%
4th clearest
Wind
7 km/h
11th windiest
Solar energy
4.38 kWh/m²
Travel score
4.6
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 30°C in the first days to 28°C by the end.

A typical September day in Thị Trấn Trùng Khánh reaches about 29°C in the afternoon and slips back to 22°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 32°C. Set against its neighbours, September runs about 1°C cooler than August and about 3°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13023
23023
33023
43023
53023
63023
73023
82923
92923
102922
112922
122922
132922
142922
152922
162922
172922
182922
192922
202922
212922
222921
232921
242821
252821
262821
272821
282821
292821
302821

How September really feels in Thị Trấn Trùng Khánh

Once humidity and wind are folded in, September averages 12 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
12
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Thị Trấn Trùng Khánh 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 daysDaylight (hours)Travel score
Jan16° / 10°6112.110.84.5
Feb18° / 12°4610.611.25.2
Mar21° / 15°8115.511.85.4
Apr25° / 19°10416.712.55.4
May28° / 22°2102213.14.1
Jun30° / 24°29124.813.43.1
Jul30° / 24°2962613.33.0
Aug30° / 23°26023.812.83.3
Sep29° / 22°15116.812.14.6
Oct26° / 19°761111.56.4
Nov22° / 15°639.110.96.7
Dec18° / 11°46910.65.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 60%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13070
23070
33169
43169
53169
63268
73268
83367
93466
103565
113565
123763
133763
143961
154060
164060
174258
184357
194357
204456
214654
224654
234753
244753
254852
264852
274852
284852
294852
304852

Chance of precipitation in September

Any precipitation

Thị Trấn Trùng Khánh gets around 151 mm of rain over 16.8 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 55% and peaks near 67% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
167
267
366
466
565
665
764
864
963
1063
1162
1261
1359
1458
1557
1655
1754
1853
1952
2050
2149
2248
2347
2446
2545
2645
2744
2843
2943
3042

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 58% of days. Sticky, muggy-or-worse air turns up on roughly 86% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1001127710
2001137610
300114769
400215749
501215739
601216738
701317718
801317718
901418707
1002419687
1102519677
1202620666
1303721636
1403821635
1503922624
16041023594
17041124583
18041224573
19051325552
20051426532
21051527512
22061628492
23061729472
24061830451
25071831431
26171931411
27181932391
28182033371
29192033351
301102134341

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
158calm
168calm
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 30 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 42 minutes over September. Sunrise moves from 5:40 AM to 5:49 AM, and sunset from 6:08 PM to 5:38 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:406:08
212.45:406:07
312.45:406:06
412.45:416:05
512.45:416:04
612.45:416:03
712.35:426:01
812.35:426:00
912.35:425:59
1012.35:425:58
1112.25:435:57
1212.25:435:56
1312.25:435:55
1412.25:445:54
1512.25:445:53
1612.15:445:52
1712.15:455:51
1812.15:455:50
1912.15:455:49
2012.05:465:48
2112.05:465:47
2212.05:465:46
2312.05:465:45
2411.95:475:44
2511.95:475:43
2611.95:475:42
2711.95:485:41
2811.95:485:40
2911.85:485:39
3011.85:495:38

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 2.06 kWh/m² to a high of 4.49 kWh/m² in August across the year — September's 4.38 kWh/m² sits near the top of that range.

012345151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Thị Trấn Trùng Khánh

In seasonPeak

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

Thị Trấn Trùng Khánh'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 Thị Trấn Trùng Khánh?

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

4.6
Sightseeing
7th-best month of the year
5.7
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Thị Trấn Trùng Khánh for sightseeing.

What to pack for Thị Trấn Trùng Khánh in September

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

In September, Thị Trấn Trùng Khánh sees daytime highs around 29°C and nights near 22°C. Pack light clothes and rain gear. About 17 days see rain.

light clothesrain gear

UV index in Thị Trấn Trùng Khánh in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Thị Trấn Trùng Khánh peaks around June 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highVery highExtremeVery highHighJun 22UV 13Dec 19UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar10Extreme
Apr7Very high
May8Very high
Jun13Extreme
Jul12Extreme
Aug10Extreme
Sep9Very high
Oct7High
Nov6High
Dec6High

Air quality in Thị Trấn Trùng Khánh 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 Thị Trấn Trùng Khánh is worst in April — around 44 µg/m³ PM2.5 (poor), about 2.2× the cleanest month (July, 20 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorApr 944 µg/m³Jul 2020 µg/m³
PM2.5 (µg/m³)Level
Jan39Poor
Feb41Poor
Mar44Poor
Apr44Poor
May30Moderate
Jun23Moderate
Jul20Moderate
Aug21Moderate
Sep24Moderate
Oct28Moderate
Nov33Moderate
Dec39Poor
Location & terrain

Where is Thị Trấn Trùng Khánh?

Thị Trấn Trùng Khánh sits at 22.8°N, 106.5°E, 530 m above sea level, in Vietnam. The nearest listed city is Cao Bằng, 33 km away.

Bắc KạnLạng SơnThị Trấn Na DươngThái NguyênHà Giang

Topography around Thị Trấn Trùng Khánh

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thị Trấn Trùng Khánh.

Within 3 km, the terrain around Thị Trấn Trùng Khánh has significant variations in elevation — a maximum elevation change of 338 m around an average of 577 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 630 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,792 m.

The land around Thị Trấn Trùng Khánh is covered by trees (56%) and cropland (25%) within 3 km, trees (75%) within 16 km, and trees (83%) within 80 km.

3 km
338 m
16 km
630 m
80 km
1,792 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Cao Bằng 33 km · Thị Trấn Nước Hai 40 km · Thị Trấn Thất Khê 65 km · Bắc Kạn 104 km · Lạng Sơn 112 km · Thị Trấn Na Dương 134 km · Thái Nguyên 155 km · Hà Giang 158 km

Vietnam travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type A / B / C / F
220 V · 50 Hz
Prices
≈ 29% of US
price level, 2025
GDP per capita
$5,066
2025
Happiness
6.4 / 10
World Happiness, 2025
Safe drinking water
59%
of population, 2024
Homicide rate
1.5
per 100k, 2011
Road deaths
30.6
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Moderate
EF EPI 500
Religion
none 86%Catholic 6%Buddhist 6%Protestant 1%

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 Thị Trấn Trùng Khánh (22.8351°, 106.525°, elevation 530 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).