Việt Trì weather in September

In September, Việt Trì sees average daytime highs of 32°C and overnight lows near 25°C, with 201 mm of rain across 17.9 wet days and about 12.1 hours of daylight. It is the 5th-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 22% 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 Trì's 4th-clearest and 11th-windiest month. For the whole year in context, see Việt Trì's year-round climate.

Daytime high
32°
5th warmest
Overnight low
25°
9th coldest
Rainfall
201 mm
17.9 wet days
Daylight
12 h 06 min
5:49 AM – 5:56 PM
Cloud cover
71%
4th clearest
Wind
5 km/h
11th windiest
Solar energy
4.26 kWh/m²
Travel score
3.3
out of 10

Việt Trì is provincial city of Vietnam.

Air quality
Good
PM10 22 µg/m³ · 2014
Density
3,716/km²
people per km²
Founded
1962

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 32°C through the month.

A typical September day in Việt Trì reaches about 32°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 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°40°151015202530
Avg high (°C)Avg low (°C)
13226
23226
33226
43226
53226
63226
73226
83226
93226
103226
113226
123226
133226
143226
153225
163225
173225
183225
193225
203225
213125
223125
233125
243125
253125
263125
273125
283125
293124
303124

How September really feels in Việt Trì

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
14 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 Trì weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 15°378.310.86.2
Feb22° / 16°267.911.36.5
Mar25° / 19°4810.411.86.4
Apr29° / 22°8110.712.55.2
May32° / 25°20117.4133.2
Jun33° / 27°21518.213.32.4
Jul33° / 27°25120.513.22.4
Aug33° / 26°31122.112.72.5
Sep32° / 25°20117.912.13.3
Oct29° / 23°10010.511.55.4
Nov26° / 19°486.7117.2
Dec22° / 16°296.510.77.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 22% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 66%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12377
22377
32377
42377
52476
62476
72476
82674
92773
102872
112971
123070
133070
143367
153367
163466
173565
183763
193862
203961
214060
224159
234258
244357
254357
264456
274555
284555
294654
304654

Chance of precipitation in September

Any precipitation

Việt Trì gets around 201 mm of rain over 17.9 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 59% and peaks near 73% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
173
273
373
472
572
671
770
869
968
1067
1166
1265
1363
1462
1561
1659
1758
1856
1955
2054
2152
2251
2350
2449
2547
2647
2746
2845
2944
3044

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 73% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100595
200694
300694
400793
501891
601990
701990
8011089
9021286
10021385
11021484
12031582
13031780
14031879
15042076
16042175
17052372
18052570
19052669
20062866
21063064
22163261
23173458
24183556
25183754
26193852
271103950
282114047
292124145
302134243

Wind in September

Winds average 5 km/h in September.

Across September, daily wind ranges from about 5 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

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 5:45 AM to 5:53 AM, and sunset from 6:11 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:456:11
212.45:456:10
312.45:466:09
412.45:466:08
512.35:466:07
612.35:476:06
712.35:476:05
812.35:476:04
912.35:476:03
1012.25:486:02
1112.25:486:01
1212.25:486:00
1312.25:485:59
1412.25:495:58
1512.15:495:57
1612.15:495:56
1712.15:495:55
1812.15:505:54
1912.15:505:53
2012.05:505:52
2112.05:505:51
2212.05:515:50
2312.05:515:49
2412.05:515:48
2511.95:515:47
2611.95:525:46
2711.95:525:45
2811.95:525:44
2911.85:535:43
3011.85:535:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.26 kWh/m².

For context, solar energy here swings from a low near 2.1 kWh/m² to a high of 4.78 kWh/m² in June across the year — September's 4.26 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
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 Việt Trì

In seasonPeak

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

Việt Trì sits in the Pacific typhoon belt; the season peaks July–October.

Việt Trì'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 Việt Trì?

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
5.2
Beach & pool
6th-best month of the year

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

What to pack for Việt Trì in September

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

In September, Việt Trì sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. About 18 days see rain.

light clothesrain gear

UV index in Việt Trì in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — 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 Trì peaks around June 20 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 21 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highHighVery highExtremeVery highVery highHighJun 20UV 11Nov 21UV 6
UV index (midday)Level
Jan6High
Feb7High
Mar9Very high
Apr6High
May7Very high
Jun11Extreme
Jul10Extreme
Aug9Very high
Sep7High
Oct8Very high
Nov6High
Dec6High

Air quality in Việt Trì 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 Trì is worst in December — around 171 µg/m³ PM2.5 (very unhealthy), about 3.4× the cleanest month (July, 50 µg/m³).

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

0306090120150180JanFebMarAprMayJunJulAugSepOctNovDecVery unhealthyUnhealthyPoorUnhealthyVery unhealthyDec 19170 µg/m³Jul 1452 µg/m³
PM2.5 (µg/m³)Level
Jan161Very unhealthy
Feb136Unhealthy
Mar122Unhealthy
Apr106Unhealthy
May76Unhealthy
Jun59Unhealthy
Jul50Poor
Aug68Unhealthy
Sep96Unhealthy
Oct125Unhealthy
Nov152Very unhealthy
Dec171Very unhealthy
Location & terrain

Where is Việt Trì?

Việt Trì sits at 21.3°N, 105.4°E, 25 m above sea level, in Vietnam. The nearest listed city is Cổ Đô, 6.0 km away.

Topography around Việt Trì

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

Within 3 km, the terrain around Việt Trì has only modest variations in elevation — a maximum elevation change of 33 m around an average of 18 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 401 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,914 m.

The land around Việt Trì is covered by artificial surfaces (40%) and trees (28%) within 3 km, cropland (38%) and trees (37%) within 16 km, and trees (73%) within 80 km.

3 km
33 m
16 km
401 m
80 km
1,914 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Cổ Đô 6.0 km · Phú Thọ 20 km · Vĩnh Yên 21 km · Sơn Tây 23 km · Ba Vì 27 km · Phúc Yên 33 km · Đan Phượng 37 km · Quang Minh 41 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 Trì (21.3227°, 105.402°, elevation 25 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). 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).