Thị Trấn Nước Hai weather in September

In September, Thị Trấn Nước Hai sees average daytime highs of 29°C and overnight lows near 22°C, with 156 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 29°C in the first days to 28°C by the end. The sky is clear or mostly clear about 19% 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 Nước Hai's 4th-clearest and 9th-windiest month. For the whole year in context, see Thị Trấn Nước Hai's year-round climate.

Daytime high
29°
4th warmest
Overnight low
22°
9th coldest
Rainfall
156 mm
16.8 wet days
Daylight
12 h 06 min
5:46 AM – 5:54 PM
Cloud cover
68%
4th clearest
Wind
7 km/h
9th windiest
Solar energy
4.29 kWh/m²
Travel score
4.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 29°C in the first days to 28°C by the end.

A typical September day in Thị Trấn Nước Hai 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 25°C and 31°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)
12923
22923
32922
42922
52922
62922
72922
82922
92922
102922
112922
122922
132922
142922
152922
162922
172821
182821
192821
202821
212821
222821
232821
242821
252821
262821
272821
282820
292820
302720

How September really feels in Thị Trấn Nước Hai

Once humidity and wind are folded in, September averages 6 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
6
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 Nước Hai 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°6713.310.84.3
Feb18° / 12°5211.411.25.1
Mar21° / 15°891611.85.3
Apr25° / 19°11117.112.55.3
May28° / 21°21422.313.14.3
Jun29° / 23°29325.213.43.2
Jul30° / 23°30226.413.33.1
Aug30° / 23°26824.412.83.4
Sep29° / 22°15616.812.14.8
Oct26° / 19°871211.56.3
Nov22° / 15°699.710.96.6
Dec18° / 11°509.410.65.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 63%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12872
22872
32872
42872
52971
62971
73169
83268
93268
103268
113367
123565
133565
143763
153763
163862
173862
184060
194060
204159
214159
224258
234357
244357
254456
264555
274456
284456
294456
304456

Chance of precipitation in September

Any precipitation

Thị Trấn Nước Hai gets around 156 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 56% and peaks near 69% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
169
268
367
467
566
666
765
864
963
1062
1161
1260
1359
1458
1557
1656
1754
1853
1952
2051
2149
2248
2347
2447
2546
2645
2745
2844
2944
3043

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 57% 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 (%)
100115795
200116794
300117784
400218764
501219744
601220734
701321714
801322713
901422703
1002523673
1102624653
1202624662
1302725642
1403826612
15031026592
16031127581
17041228551
18041328541
19041429521
20041530501
21051631481
22051731461
23051832431
24061933411
25062034391
26072035371
27172136351
28182136330
29192237310
30192237300

Wind in September

Winds average 7 km/h in September.

Across September, daily wind ranges from about 6 km/h on the calmest days to 7 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:41 AM to 5:50 AM, and sunset from 6:09 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.55:416:09
212.45:426:08
312.45:426:07
412.45:426:06
512.45:436:05
612.45:436:04
712.35:436:03
812.35:436:02
912.35:446:01
1012.35:446:00
1112.25:445:59
1212.25:455:58
1312.25:455:57
1412.25:455:56
1512.25:465:55
1612.15:465:54
1712.15:465:53
1812.15:465:52
1912.15:475:50
2012.05:475:49
2112.05:475:48
2212.05:485:47
2312.05:485:46
2411.95:485:45
2511.95:495:44
2611.95:495:43
2711.95:495:42
2811.95:505:41
2911.85:505:40
3011.85:505:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.29 kWh/m².

For context, solar energy here swings from a low near 2.06 kWh/m² to a high of 4.43 kWh/m² in August across the year — September's 4.29 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Thị Trấn Nước Hai

In seasonPeak

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

Thị Trấn Nước Hai'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 Nước Hai?

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

4.8
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 Nước Hai for sightseeing.

What to pack for Thị Trấn Nước Hai in September

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

In September, Thị Trấn Nước Hai 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 Nước Hai 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 Nước Hai peaks around June 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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 22UV 6
UV index (midday)Level
Jan6High
Feb8Very high
Mar11Extreme
Apr8Very high
May9Very high
Jun13Extreme
Jul13Extreme
Aug11Extreme
Sep9Very high
Oct7Very high
Nov6High
Dec6High

Air quality in Thị Trấn Nước Hai 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 Nước Hai 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 Nước Hai?

Thị Trấn Nước Hai sits at 22.7°N, 106.2°E, 204 m above sea level, in Vietnam. The nearest listed city is Cao Bằng, 13 km away.

Lạng SơnHà GiangThái NguyênThị Trấn Đại Từ

Topography around Thị Trấn Nước Hai

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

Within 3 km, the terrain around Thị Trấn Nước Hai has significant variations in elevation — a maximum elevation change of 291 m around an average of 242 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 871 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,796 m.

The land around Thị Trấn Nước Hai is covered by trees (67%) and cropland (27%) within 3 km, trees (83%) within 16 km, and trees (89%) within 80 km.

3 km
291 m
16 km
871 m
80 km
1,796 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Cao Bằng 13 km · Thị Trấn Trùng Khánh 40 km · Thị Trấn Thất Khê 63 km · Bắc Kạn 73 km · Lạng Sơn 117 km · Hà Giang 120 km · Thái Nguyên 131 km · Thị Trấn Đại Từ 134 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 Nước Hai (22.7374°, 106.1522°, elevation 204 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).