Nghĩa Lộ weather in September

In September, Nghĩa Lộ sees average daytime highs of 26°C and overnight lows near 20°C, with 290 mm of rain across 23.4 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 26°C through the month. The sky is clear or mostly clear about 13% of the time in September, and the air most often feels muggy.

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 Nghĩa Lộ's 8th-clearest and 8th-windiest month. For the whole year in context, see Nghĩa Lộ's year-round climate.

Daytime high
26°
5th warmest
Overnight low
20°
9th coldest
Rainfall
290 mm
23.4 wet days
Daylight
12 h 06 min
5:53 AM – 6:00 PM
Cloud cover
76%
8th clearest
Wind
4 km/h
8th windiest
Solar energy
4.21 kWh/m²
Travel score
4.4
out of 10

Nghĩa Lộ is town in Yen Bai province, Vietnam.

Density
2,304/km²
people per km²

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 26°C through the month.

A typical September day in Nghĩa Lộ reaches about 26°C in the afternoon and slips back to 20°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 28°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

15°20°25°30°151015202530
Avg high (°C)Avg low (°C)
12721
22721
32721
42720
52620
62620
72620
82620
92620
102620
112620
122620
132620
142620
152620
162620
172620
182620
192620
202620
212620
222619
232619
242519
252519
262519
272519
282519
292519
302519

Nghĩa Lộ 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
Jan16° / 10°7513.810.84.5
Feb18° / 11°711411.35.1
Mar21° / 14°13418.111.85.3
Apr25° / 17°19420.612.55.1
May27° / 20°30023.6134.4
Jun28° / 22°31825.213.33.8
Jul27° / 21°41326.413.23.8
Aug27° / 21°43928.112.73.7
Sep26° / 20°29023.412.14.4
Oct24° / 17°15317.511.55.6
Nov21° / 14°8312.4116.0
Dec17° / 11°6410.910.75.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% 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 75%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11882
21882
31882
41882
51981
61981
72080
82080
92080
102080
112179
122179
132179
142278
152476
162476
172476
182674
192674
202773
213070
223169
233169
243268
253466
263466
273466
283565
293565
303565

Chance of precipitation in September

Any precipitation

Nghĩa Lộ gets around 290 mm of rain over 23.4 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 78% and peaks near 88% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
188
287
387
487
587
686
786
885
985
1084
1183
1283
1382
1481
1580
1679
1778
1876
1975
2074
2173
2272
2371
2470
2569
2668
2767
2867
2966
3065

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the muggy band about 70% of days. Sticky, muggy-or-worse air turns up on roughly 85% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
10027028
20027127
30037027
40037126
50147124
60147223
70157222
80157321
90167320
100267418
110277417
120277516
130287515
141397314
1513107313
1613107412
1714117212
1814127211
1915137011
2015147010
2115156910
2216156810
2316166710
241717669
251818649
261819648
271920628
2811021617
2911022607
3011122606

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 3 km/h on the calmest days to 4 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
13calm
23calm
33calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 5:49 AM to 5:57 AM, and sunset from 6:15 PM to 5:46 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:496:15
212.45:496:14
312.45:496:13
412.45:496:12
512.45:506:11
612.35:506:10
712.35:506:09
812.35:506:08
912.35:516:07
1012.25:516:06
1112.25:516:05
1212.25:526:04
1312.25:526:03
1412.25:526:02
1512.15:526:01
1612.15:536:00
1712.15:535:59
1812.15:535:58
1912.15:535:57
2012.05:545:56
2112.05:545:55
2212.05:545:54
2312.05:545:53
2412.05:555:52
2511.95:555:51
2611.95:555:50
2711.95:565:49
2811.95:565:48
2911.85:565:47
3011.85:575:46

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.21 kWh/m².

For context, solar energy here swings from a low near 2.78 kWh/m² to a high of 4.92 kWh/m² in May across the year — September's 4.21 kWh/m² falls in the middle.

012345151015202530
Solar energy (kWh/m²)Level
14.3Bright
24.3Bright
34.3Bright
44.3Bright
54.3Bright
64.3Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.2Bright
124.2Bright
134.2Bright
144.2Bright
154.2Bright
164.2Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.1Bright
264.1Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Nghĩa Lộ

In seasonPeak

In September, Nghĩa Lộ sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Nghĩa Lộ's rainy season runs May–September, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Nghĩa Lộ?

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

4.4
Sightseeing
8th-best month of the year
4.2
Beach & pool
4th-best month of the year

September is a reasonable time to visit Nghĩa Lộ for sightseeing.

What to pack for Nghĩa Lộ in September

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

In September, Nghĩa Lộ sees daytime highs around 26°C and nights near 20°C. Pack rain gear. Worth having: light clothes. About 23 days see rain.

rain gearlight clothes

UV index in Nghĩa Lộ in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nghĩa Lộ peaks around June 20 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highExtremeVery highHighJun 20UV 14Dec 20UV 6
UV index (midday)Level
Jan7High
Feb9Very high
Mar12Extreme
Apr9Very high
May11Extreme
Jun14Extreme
Jul13Extreme
Aug13Extreme
Sep9Very high
Oct9Very high
Nov8Very high
Dec6High

Air quality in Nghĩa Lộ 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 Nghĩa Lộ is worst in April — around 70 µg/m³ PM2.5 (unhealthy), about 4.5× the cleanest month (July, 16 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecPoorUnhealthyModeratePoorApr 1169 µg/m³Jul 2016 µg/m³
PM2.5 (µg/m³)Level
Jan43Poor
Feb48Poor
Mar64Unhealthy
Apr70Unhealthy
May34Moderate
Jun18Moderate
Jul16Moderate
Aug17Moderate
Sep23Moderate
Oct30Moderate
Nov37Poor
Dec42Poor
Location & terrain

Where is Nghĩa Lộ?

Nghĩa Lộ sits at 21.6°N, 104.5°E, 260 m above sea level, in Vietnam. The nearest listed city is Yên Bái, 43 km away.

Cổ Đô

Topography around Nghĩa Lộ

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

Within 3 km, the terrain around Nghĩa Lộ has only modest variations in elevation — a maximum elevation change of 242 m around an average of 279 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,218 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,909 m.

The land around Nghĩa Lộ is covered by cropland (41%) and trees (38%) within 3 km, trees (77%) within 16 km, and trees (80%) within 80 km.

3 km
242 m
16 km
2,218 m
80 km
2,909 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Yên Bái 43 km · Ít Ong 51 km · Sơn La 69 km · Tuyên Quang 76 km · Phú Thọ 76 km · Thị Trấn Phố Lu 87 km · Thị Trấn Thuận Châu 87 km · Cổ Đô 95 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 Nghĩa Lộ (21.6°, 104.5167°, elevation 260 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).