Phổ Yên weather in September

In September, Phổ Yên sees average daytime highs of 31°C and overnight lows near 25°C, with 211 mm of rain across 17.9 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 31°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 Phổ Yên's 4th-clearest and 11th-windiest month. For the whole year in context, see Phổ Yên's year-round climate.

Daytime high
31°
4th warmest
Overnight low
25°
9th coldest
Rainfall
211 mm
17.9 wet days
Daylight
12 h 06 min
5:47 AM – 5:54 PM
Cloud cover
69%
4th clearest
Wind
6 km/h
11th windiest
Solar energy
4.41 kWh/m²
Travel score
3.4
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 Phổ Yên reaches about 31°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)
13225
23225
33225
43225
53225
63225
73225
83225
93225
103225
113225
123225
133225
143125
153125
163125
173125
183124
193124
203124
213124
223124
233124
243124
253124
263124
273124
283124
293124
303124

How September really feels in Phổ 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
7 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.

Phổ 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°5110.810.85.8
Feb21° / 15°4210.711.35.8
Mar24° / 18°7214.611.85.8
Apr28° / 22°9913.812.55.1
May31° / 25°24019.1133.4
Jun33° / 26°29321.113.32.5
Jul33° / 26°31723.213.22.5
Aug32° / 26°35924.712.72.5
Sep31° / 25°21117.912.13.4
Oct29° / 22°9510.711.55.4
Nov26° / 19°567.4117.0
Dec22° / 15°387.710.76.8

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 14% of September, with mostly cloudy or overcast conditions the remaining 64%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12575
22674
32674
42674
52674
62773
72872
82872
92971
103070
113169
123268
133268
143565
153565
163763
173763
183862
194060
204159
214258
224456
234456
244555
254753
264753
274852
284852
294951
305050

Chance of precipitation in September

Any precipitation

Phổ Yên gets around 211 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 60% 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
374
474
573
673
772
871
969
1068
1167
1265
1363
1462
1560
1658
1757
1855
1954
2052
2151
2250
2349
2448
2547
2646
2745
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 65% 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
20011089
30011188
40011188
50121285
60121384
70121483
80131482
90131581
100141679
110151777
120261874
130261973
140272071
150282169
160292267
1702102464
1802112562
1902122660
2002132857
2103142954
2203153052
2303163249
2403173347
2504173444
2604183542
2715193640
2816193738
2916203835
3017203833

Wind in September

Winds average 6 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
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

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 5:43 AM to 5:51 AM, and sunset from 6:09 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:436:09
212.45:436:08
312.45:446:07
412.45:446:06
512.45:446:05
612.35:456:04
712.35:456:03
812.35:456:02
912.35:456:01
1012.25:466:00
1112.25:465:59
1212.25:465:58
1312.25:465:57
1412.25:475:56
1512.15:475:55
1612.15:475:54
1712.15:475:53
1812.15:485:52
1912.15:485:51
2012.05:485:50
2112.05:485:49
2212.05:495:48
2312.05:495:47
2412.05:495:46
2511.95:505:45
2611.95:505:44
2711.95:505:43
2811.95:505:42
2911.85:515:42
3011.85:515:41

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 2.12 kWh/m² to a high of 4.71 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
44.4Bright
54.4Bright
64.4Bright
74.4Bright
84.4Bright
94.4Bright
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
284.4Bright
294.4Bright
304.4Bright
Planning a trip in September

Hazard calendar for Phổ Yên

In seasonPeak

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

Phổ 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 Phổ Yên?

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

3.4
Sightseeing
8th-best month of the year
5.2
Beach & pool
4th-best month of the year

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

What to pack for Phổ Yên in September

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

In September, Phổ Yên sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 18 days see rain.

light clothesrain gear

UV index in Phổ 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 Phổ Yên peaks around July 11 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 highHighJul 11UV 11Nov 23UV 6
UV index (midday)Level
Jan6High
Feb7High
Mar9Very high
Apr6High
May9Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep8Very high
Oct8Very high
Nov6High
Dec6High

Air quality in Phổ 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 Phổ Yên is worst in December — around 102 µg/m³ PM2.5 (unhealthy), about 2.8× the cleanest month (July, 37 µg/m³).

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

0306090120JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorUnhealthyDec 20102 µg/m³Jul 1738 µg/m³
PM2.5 (µg/m³)Level
Jan98Unhealthy
Feb89Unhealthy
Mar86Unhealthy
Apr79Unhealthy
May57Unhealthy
Jun44Poor
Jul37Poor
Aug44Poor
Sep59Unhealthy
Oct76Unhealthy
Nov92Unhealthy
Dec102Unhealthy
Location & terrain

Where is Phổ Yên?

Phổ Yên sits at 21.4°N, 105.9°E, 22 m above sea level, in Vietnam. The nearest listed city is Thành phố Sông Công, 8.0 km away.

Topography around Phổ Yên

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

Within 3 km, the terrain around Phổ Yên has only modest variations in elevation — a maximum elevation change of 53 m around an average of 17 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 449 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,720 m.

The land around Phổ Yên is covered by trees (38%), artificial surfaces (30%) and cropland (24%) within 3 km, trees (51%) and cropland (35%) within 16 km, and trees (66%) and cropland (23%) within 80 km.

3 km
53 m
16 km
449 m
80 km
1,720 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Thành phố Sông Công 8.0 km · Sóc Sơn 19 km · Thái Nguyên 20 km · Phúc Yên 28 km · Quang Minh 28 km · Việt Yên 30 km · Vĩnh Yên 32 km · Bắc Ninh 32 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 Phổ Yên (21.4198°, 105.8899°, elevation 22 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).