Phú Thọ weather in September

In September, Phú Thọ sees average daytime highs of 31°C and overnight lows near 25°C, with 225 mm of rain across 19.3 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 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 Phú Thọ's 4th-clearest and 9th-windiest month. For the whole year in context, see Phú Thọ's year-round climate.

Daytime high
31°
5th warmest
Overnight low
25°
9th coldest
Rainfall
225 mm
19.3 wet days
Daylight
12 h 06 min
5:50 AM – 5:57 PM
Cloud cover
70%
4th clearest
Wind
5 km/h
9th windiest
Solar energy
4.27 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 31°C through the month.

A typical September day in Phú Thọ 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 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
63226
73225
83225
93225
103225
113225
123225
133225
143225
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263124
273124
283124
293124
303124

How September really feels in Phú Thọ

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
12 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.

Phú Thọ 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° / 15°295.510.86.6
Feb22° / 16°195.211.36.9
Mar25° / 19°437.211.86.9
Apr29° / 22°8610.212.55.2
May32° / 25°21917.3133.3
Jun33° / 26°27919.513.32.5
Jul33° / 26°3022213.22.5
Aug32° / 26°36923.412.72.5
Sep31° / 25°22519.312.13.3
Oct29° / 23°10311.511.55.4
Nov26° / 19°516.7117.2
Dec22° / 16°285.410.77.2

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 13% 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
32575
42674
52674
62575
72674
82773
92773
102872
112971
123169
133169
143268
153466
163466
173664
183763
193862
203961
214159
224258
234258
244456
254555
264555
274654
284654
294654
304654

Chance of precipitation in September

Any precipitation

Phú Thọ gets around 225 mm of rain over 19.3 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 64% and peaks near 76% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
176
276
376
476
575
675
774
874
973
1072
1171
1270
1368
1467
1566
1664
1763
1861
1960
2058
2157
2256
2355
2454
2553
2652
2751
2850
2949
3048

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 74% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Humid (%)Muggy (%)Oppressive (%)Miserable (%)
100595
200595
300694
401792
501891
601891
701990
8011089
9021187
10021286
11021385
12021484
13031681
14031780
15031879
16042076
17042175
18042373
19042571
20052768
21052966
22153163
23163360
24163558
25173656
26183853
27184051
28194148
291104346
302114444

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 5:46 AM to 5:54 AM, and sunset from 6:12 PM to 5:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:466:12
212.45:466:11
312.45:466:10
412.45:476:09
512.35:476:08
612.35:476:07
712.35:476:06
812.35:486:05
912.35:486:04
1012.25:486:03
1112.25:496:02
1212.25:496:01
1312.25:496:00
1412.25:495:59
1512.15:505:58
1612.15:505:57
1712.15:505:56
1812.15:505:55
1912.15:515:54
2012.05:515:53
2112.05:515:52
2212.05:515:51
2312.05:525:50
2412.05:525:49
2511.95:525:48
2611.95:525:47
2711.95:535:46
2811.95:535:45
2911.85:535:44
3011.85:545:43

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.27 kWh/m².

For context, solar energy here swings from a low near 2.1 kWh/m² to a high of 4.69 kWh/m² in June across the year — September's 4.27 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
104.3Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Phú Thọ

In seasonPeak

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

Phú Thọ sits in the Pacific typhoon belt; the season peaks July–October.

Phú Thọ'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 Phú Thọ?

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

September is a weaker month for outdoor sightseeing in Phú Thọ.

What to pack for Phú Thọ in September

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

In September, Phú Thọ 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 Phú Thọ 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 Phú Thọ 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 Phú Thọ 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 Phú Thọ is worst in December — around 83 µg/m³ PM2.5 (unhealthy), about 2.9× the cleanest month (July, 29 µg/m³).

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

0306090JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyDec 2383 µg/m³Jul 2029 µg/m³
PM2.5 (µg/m³)Level
Jan83Unhealthy
Feb78Unhealthy
Mar78Unhealthy
Apr72Unhealthy
May50Poor
Jun36Poor
Jul29Moderate
Aug32Moderate
Sep42Poor
Oct57Unhealthy
Nov73Unhealthy
Dec83Unhealthy
Location & terrain

Where is Phú Thọ?

Phú Thọ sits at 21.4°N, 105.2°E, 32 m above sea level, in Vietnam. The nearest listed city is Cổ Đô, 20 km away.

Topography around Phú Thọ

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

Within 3 km, the terrain around Phú Thọ has only modest variations in elevation — a maximum elevation change of 34 m around an average of 23 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 391 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,752 m.

The land around Phú Thọ is covered by trees (39%) and cropland (32%) within 3 km, trees (62%) and cropland (24%) within 16 km, and trees (77%) within 80 km.

3 km
34 m
16 km
391 m
80 km
2,752 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Cổ Đô 20 km · Việt Trì 20 km · Ba Vì 39 km · Vĩnh Yên 41 km · Sơn Tây 41 km · Tuyên Quang 47 km · Yên Bái 48 km · Thị Trấn Đại Từ 50 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 Phú Thọ (21.3996°, 105.2222°, elevation 32 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).