Thành Phố Uông Bí weather in September

In September, Thành Phố Uông Bí sees average daytime highs of 31°C and overnight lows near 25°C, with 242 mm of rain across 20.3 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 19% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Thành Phố Uông Bí's 4th-clearest and 11th-windiest month. For the whole year in context, see Thành Phố Uông Bí's year-round climate.

Daytime high
31°
4th warmest
Overnight low
25°
8th coldest
Rainfall
242 mm
20.3 wet days
Daylight
12 h 06 min
5:44 AM – 5:51 PM
Cloud cover
71%
4th clearest
Wind
7 km/h
11th windiest
Solar energy
4.45 kWh/m²
Travel score
3.4
out of 10

Thành Phố Uông Bí is city in north-east, Vietnam.

Density
249/km²
people per km²
Founded
1961

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 31°C through the month.

A typical September day in Thành Phố Uông Bí reaches about 31°C in the afternoon and slips back to 25°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 33°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13126
23126
33126
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213124
223124
233124
243124
253124
263024
273024
283024
293024
303024

How September really feels in Thành Phố Uông Bí

Once humidity and wind are folded in, September averages 30 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
30
2 feel dangerously hot (≥ 39°C)
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.

Thành Phố Uông Bí 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
Jan20° / 14°30610.96.4
Feb21° / 16°195.711.36.5
Mar23° / 18°439.111.96.6
Apr27° / 22°751212.55.6
May31° / 25°24119.8133.6
Jun32° / 27°26022.513.32.6
Jul32° / 27°29024.613.22.5
Aug32° / 26°37126.612.72.5
Sep31° / 25°24220.312.13.4
Oct29° / 22°10412.511.55.4
Nov26° / 19°537.8117.1
Dec22° / 15°295.710.77.1

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 14% of September, with mostly cloudy or overcast conditions the remaining 67%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12278
22278
32278
42278
52278
62476
72476
82476
92575
102674
112773
122872
133070
143070
153268
163367
173466
183664
193664
203862
213862
224060
234159
244258
254357
264456
274456
284555
294654
304852

Chance of precipitation in September

Any precipitation

Thành Phố Uông Bí gets around 242 mm of rain over 20.3 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 67% and peaks near 86% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
186
285
385
484
584
683
781
880
978
1077
1175
1273
1371
1469
1567
1665
1763
1862
1960
2059
2157
2256
2355
2455
2554
2653
2753
2852
2951
3051

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the miserable band about 70% of days. Sticky, muggy-or-worse air turns up on roughly 98% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100793
200892
301891
401990
5111088
6111187
7121186
8121285
9121384
10131482
11131581
12141679
13251776
14251875
15261973
16272071
17282169
18292267
192102464
202102563
212112760
222122957
232133055
242133253
253143350
263143548
273153646
284153743
295163841
306163939

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
157calm
167calm
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 24 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 36 minutes over September. Sunrise moves from 5:40 AM to 5:47 AM, and sunset from 6:05 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:406:05
212.45:406:04
312.45:406:03
412.45:416:03
512.35:416:02
612.35:416:01
712.35:416:00
812.35:425:59
912.35:425:58
1012.25:425:57
1112.25:425:56
1212.25:435:55
1312.25:435:54
1412.25:435:53
1512.15:435:52
1612.15:445:51
1712.15:445:50
1812.15:445:49
1912.15:445:48
2012.05:455:47
2112.05:455:46
2212.05:455:45
2312.05:455:44
2412.05:465:43
2511.95:465:42
2611.95:465:41
2711.95:465:40
2811.95:475:39
2911.95:475:38
3011.85:475:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.45 kWh/m².

For context, solar energy here swings from a low near 2.41 kWh/m² to a high of 4.96 kWh/m² in June across the year — September's 4.45 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.5Bright
154.5Bright
164.5Bright
174.5Bright
184.5Bright
194.5Bright
204.5Bright
214.5Bright
224.5Bright
234.5Bright
244.5Bright
254.5Bright
264.5Bright
274.5Bright
284.5Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Thành Phố Uông Bí

In seasonPeak

In September, Thành Phố Uông Bí sits inside its pacific typhoon and monsoon season. The full year is below, with each hazard's peak months called out.

Thành Phố Uông Bí sits in the Pacific typhoon belt; the season peaks July–October.

Thành Phố Uông Bí's monsoon runs May–September, when most of the year's rain falls.

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

Is September a good time to visit Thành Phố Uông Bí?

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

3.4
Sightseeing
9th-best month of the year
5.0
Beach & pool
6th-best month of the year

September is a weaker month for outdoor sightseeing in Thành Phố Uông Bí.

What to pack for Thành Phố Uông Bí in September

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

In September, Thành Phố Uông Bí sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 20 days see rain.

light clothesrain gear

Sea temperature near Thành Phố Uông Bí in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 47 km away) is warmest in August at about 30°C and coldest in February near 20°C.

It's comfortable for a long swim from Feb 28 to Jan 27 — about 11 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan20Refreshing
Feb20Cool
Mar20Refreshing
Apr23Refreshing
May27Warm
Jun29Tropical
Jul30Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov26Warm
Dec23Refreshing

UV index in Thành Phố Uông Bí 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 Thành Phố Uông Bí peaks around July 10 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 10UV 12Dec 15UV 6
UV index (midday)Level
Jan7High
Feb7Very high
Mar8Very high
Apr7Very high
May10Very high
Jun12Extreme
Jul12Extreme
Aug8Very high
Sep9Very high
Oct9Very high
Nov6High
Dec6High

Air quality in Thành Phố Uông Bí 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 Thành Phố Uông Bí is worst in December — around 92 µg/m³ PM2.5 (unhealthy), about 2.6× the cleanest month (July, 35 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyDec 2192 µg/m³Jul 1335 µg/m³
PM2.5 (µg/m³)Level
Jan90Unhealthy
Feb80Unhealthy
Mar76Unhealthy
Apr66Unhealthy
May49Poor
Jun37Poor
Jul35Moderate
Aug40Poor
Sep59Unhealthy
Oct74Unhealthy
Nov82Unhealthy
Dec92Unhealthy
Location & terrain

Where is Thành Phố Uông Bí?

Thành Phố Uông Bí sits at 21.0°N, 106.8°E, 11 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Mạo Khê, 19 km away.

Topography around Thành Phố Uông Bí

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thành Phố Uông Bí.

Within 3 km, the terrain around Thành Phố Uông Bí has only modest variations in elevation — a maximum elevation change of 231 m around an average of 20 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,047 m; within 80 km, large variations in elevation — a maximum elevation change of 1,180 m.

The land around Thành Phố Uông Bí is covered by trees (41%) and artificial surfaces (24%) within 3 km, trees (55%) within 16 km, and trees (45%) and water (26%) within 80 km.

3 km
231 m
16 km
1,047 m
80 km
1,180 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Thị Trấn Mạo Khê 19 km · Haiphong 21 km · Thị Trấn Đông Triều 27 km · Kiến An 30 km · Ha Long 33 km · Đố Sơn 36 km · Chũ 43 km · Cát Bà 45 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 Thành Phố Uông Bí (21.0343°, 106.7705°, elevation 11 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).