Việt Yên weather in September

In September, Việt Yên sees average daytime highs of 32°C and overnight lows near 25°C, with 230 mm of rain across 19.1 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 5th-wettest month of the year here.

Day-to-day highs hold fairly steady near 32°C through the month. The sky is clear or mostly clear about 21% 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 Việt Yên's 4th-clearest and 11th-windiest month. For the whole year in context, see Việt Yên's year-round climate.

Daytime high
32°
4th warmest
Overnight low
25°
8th coldest
Rainfall
230 mm
19.1 wet days
Daylight
12 h 06 min
5:46 AM – 5:53 PM
Cloud cover
70%
4th clearest
Wind
7 km/h
11th windiest
Solar energy
4.41 kWh/m²
Travel score
3.3
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical September day in Việt Yên reaches about 32°C in the afternoon and slips back to 25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 28°C and 34°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)
13226
23226
33226
43226
53226
63225
73225
83225
93225
103225
113225
123225
133225
143225
153225
163225
173225
183125
193125
203125
213125
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in Việt Yên

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
10 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.

Việt Yên 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
Jan20° / 14°377.110.96.3
Feb21° / 16°246.611.36.5
Mar24° / 18°5010.211.86.4
Apr28° / 22°8511.712.55.3
May32° / 25°26119.3133.3
Jun33° / 27°2852113.32.4
Jul33° / 27°30123.613.22.3
Aug32° / 26°36025.112.72.4
Sep32° / 25°23019.112.13.3
Oct29° / 22°10711.611.55.2
Nov26° / 19°577.3117.0
Dec22° / 15°336.210.77.0

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 14% of September, with mostly cloudy or overcast conditions the remaining 65%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12575
22575
32674
42674
52674
62674
72674
82773
92872
102971
113070
123169
133268
143367
153367
163565
173565
183763
193862
203961
214060
224258
234258
244357
254555
264555
274654
284753
294852
304951

Chance of precipitation in September

Any precipitation

Việt Yên gets around 230 mm of rain over 19.1 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 63% and peaks near 78% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
178
278
378
478
577
677
776
875
974
1073
1171
1270
1368
1466
1564
1662
1761
1859
1957
2056
2154
2253
2352
2451
2550
2649
2749
2848
2948
3047

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 68% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1001990
2001990
30011089
40011188
50111187
60121285
70121285
80131383
90131482
100131482
110141580
120251677
130251776
140261874
150271972
160282070
170292168
1802102266
1902112364
2002122462
2103132559
2203142756
2303152854
2403162952
2504163049
2604173147
2705173245
2806183343
2917183440
3017183538

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 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
16calm
26calm
36calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
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 5:42 AM to 5:50 AM, and sunset from 6:08 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:426:08
212.45:436:07
312.45:436:06
412.45:436:05
512.35:436:04
612.35:446:03
712.35:446:02
812.35:446:01
912.35:446:00
1012.25:455:59
1112.25:455:58
1212.25:455:57
1312.25:455:56
1412.25:465:55
1512.15:465:54
1612.15:465:53
1712.15:465:52
1812.15:475:51
1912.15:475:50
2012.05:475:49
2112.05:475:48
2212.05:485:47
2312.05:485:46
2412.05:485:45
2511.95:495:44
2611.95:495:43
2711.95:495:42
2811.95:495:42
2911.85:505:41
3011.85:505:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.41 kWh/m².

For context, solar energy here swings from a low near 2.19 kWh/m² to a high of 4.86 kWh/m² in June across the year — September's 4.41 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.4Bright
24.4Bright
34.4Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.3Bright
104.4Bright
114.4Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.4Bright
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 Việt Yên

In seasonPeak

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

Việt Yên'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 Việt Yên?

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

3.3
Sightseeing
8th-best month of the year
5.1
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Việt Yên.

What to pack for Việt Yên in September

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

In September, Việt Yên sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. About 19 days see rain.

light clothesrain gear

UV index in Việt Yên in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Việt Yên peaks around June 20 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 23 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 20UV 11Nov 23UV 6
UV index (midday)Level
Jan6High
Feb7Very high
Mar9Very high
Apr6High
May8Very high
Jun11Extreme
Jul10Extreme
Aug9Very high
Sep8Very high
Oct8Very high
Nov6High
Dec6High

Air quality in Việt Yên 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 Việt Yên 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 Việt Yên?

Việt Yên sits at 21.3°N, 106.1°E, 6 m above sea level, in Vietnam. The nearest listed city is Bắc Giang, 6.0 km away.

Topography around Việt Yên

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

Within 3 km, the terrain around Việt Yên has only modest variations in elevation — a maximum elevation change of 50 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 247 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,694 m.

The land around Việt Yên is covered by cropland (43%) and artificial surfaces (29%) within 3 km, cropland (50%) and trees (24%) within 16 km, and trees (57%) and cropland (29%) within 80 km.

3 km
50 m
16 km
247 m
80 km
1,694 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Bắc Giang 6.0 km · Cung Kiệm 9.0 km · Bắc Ninh 11 km · Thuận Thanh 25 km · Từ Sơn 25 km · Chí Linh 29 km · Sóc Sơn 29 km · Phổ Yên 30 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 Việt Yên (21.2667°, 106.1333°, elevation 6 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).