Ba Vì weather in September

In September, Ba Vì sees average daytime highs of 31°C and overnight lows near 25°C, with 236 mm of rain across 18.5 wet days and about 12.1 hours of daylight. It is the 5th-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 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 Ba Vì's 4th-clearest and 10th-windiest month. For the whole year in context, see Ba Vì's year-round climate.

Daytime high
31°
5th warmest
Overnight low
25°
9th coldest
Rainfall
236 mm
18.5 wet days
Daylight
12 h 06 min
5:49 AM – 5:56 PM
Cloud cover
72%
4th clearest
Wind
5 km/h
10th windiest
Solar energy
4.22 kWh/m²
Travel score
3.6
out of 10

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 Ba Vì 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 27°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)
13225
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203124
213124
223124
233124
243024
253024
263024
273024
283024
293024
303024

How September really feels in Ba Vì

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
3 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.

Ba Vì weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 14°377.610.96.3
Feb22° / 16°246.511.36.6
Mar24° / 18°51911.96.7
Apr29° / 22°10411.112.55.3
May32° / 25°24418.3133.3
Jun33° / 26°2311913.32.5
Jul33° / 26°27821.113.22.6
Aug32° / 26°33022.912.72.7
Sep31° / 25°23618.512.13.6
Oct28° / 22°1331211.55.6
Nov25° / 19°587.4117.2
Dec21° / 15°336.310.77.0

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 11% 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
52377
62377
72377
82476
92476
102674
112773
122773
132971
143070
153070
163367
173367
183565
193664
203763
213862
223961
234159
244258
254456
264456
274456
284555
294555
304555

Chance of precipitation in September

Any precipitation

Ba Vì gets around 236 mm of rain over 18.5 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 62% and peaks near 75% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
175
275
375
474
574
673
773
872
971
1070
1168
1267
1366
1465
1563
1662
1760
1859
1957
2056
2155
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 66% of days. Sticky, muggy-or-worse air turns up on roughly 99% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100991
2001090
3001090
4011188
5011287
6111385
7111583
8121681
9121780
10131878
11131977
12132175
13142273
14152470
15152569
16162667
17172864
18173062
19183160
20193357
21193555
221103653
231113850
242114047
252124145
262134242
273134440
283144538
294154636
304164633

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 6 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
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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
212.45:466:10
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
2511.95:525:47
2611.95:525:46
2711.95:525:46
2811.95:525:45
2911.85:535:44
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 4.22 kWh/m².

For context, solar energy here swings from a low near 2.17 kWh/m² to a high of 4.87 kWh/m² in June across the year — September's 4.22 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.2Bright
54.2Bright
64.2Bright
74.2Bright
84.2Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Ba Vì

In seasonPeak

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

Ba Vì'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 Ba Vì?

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

3.6
Sightseeing
8th-best month of the year
5.2
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Ba Vì.

What to pack for Ba Vì in September

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

In September, Ba Vì sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 19 days see rain.

light clothesrain gear

UV index in Ba Vì in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ba Vì peaks around June 20 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 20 at about 5 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highHighVery highExtremeHighJun 20UV 12Nov 20UV 5
UV index (midday)Level
Jan6High
Feb7High
Mar8Very high
Apr6High
May8Very high
Jun12Extreme
Jul11Extreme
Aug11Extreme
Sep6High
Oct7Very high
Nov5High
Dec6High

Air quality in Ba Vì 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 Ba Vì 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 Ba Vì?

Ba Vì sits at 21.1°N, 105.4°E, 322 m above sea level, in Vietnam. The nearest listed city is Sơn Tây, 14 km away.

Topography around Ba Vì

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

Within 3 km, the terrain around Ba Vì has large variations in elevation — a maximum elevation change of 1,193 m around an average of 262 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,256 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,753 m.

The land around Ba Vì is covered by trees (94%) within 3 km, trees (67%) within 16 km, and trees (68%) within 80 km.

3 km
1,193 m
16 km
1,256 m
80 km
1,753 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Sơn Tây 14 km · Cổ Đô 22 km · Việt Trì 27 km · Đan Phượng 29 km · Xuân Mai 29 km · Hòa Bình 30 km · Vĩnh Yên 34 km · Thượng Cát 36 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 Ba Vì (21.0833°, 105.3833°, elevation 322 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).