Nghi Sơn weather in September

In September, Nghi Sơn sees average daytime highs of 31°C and overnight lows near 26°C, with 293 mm of rain across 19.4 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 32°C in the first days to 30°C by the end. The sky is clear or mostly clear about 18% 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 Nghi Sơn's 7th-clearest and 12th-windiest month. For the whole year in context, see Nghi Sơn's year-round climate.

Daytime high
31°
5th warmest
Overnight low
26°
8th coldest
Rainfall
293 mm
19.4 wet days
Daylight
12 h 06 min
5:48 AM – 5:54 PM
Cloud cover
74%
7th clearest
Wind
9 km/h
12th windiest
Solar energy
4.49 kWh/m²
Travel score
3.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 32°C in the first days to 30°C by the end.

A typical September day in Nghi Sơn reaches about 31°C in the afternoon and slips back to 26°C overnight — a 5°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 2°C cooler than August and about 3°C warmer than October.

20°25°30°35°40°151015202530
Avg high (°C)Avg low (°C)
13227
23227
33226
43226
53226
63226
73226
83226
93126
103126
113126
123126
133126
143126
153126
163126
173126
183126
193126
203126
213126
223125
233125
243125
253025
263025
273025
283025
293025
303025

How September really feels in Nghi Sơn

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
9 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.

Nghi Sơn weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 16°234.9116.8
Feb22° / 17°153.911.37.1
Mar25° / 20°315.711.97.2
Apr29° / 23°47712.45.5
May33° / 26°11512.112.93.3
Jun35° / 28°12411.613.12.2
Jul35° / 28°17213.1132.4
Aug33° / 27°26320.112.72.6
Sep31° / 26°29319.412.13.4
Oct29° / 23°21916.311.65.0
Nov26° / 20°63911.16.7
Dec22° / 17°30510.97.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% 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 70%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12080
22080
32179
42080
52080
62179
72278
82278
92377
102377
112575
122674
132674
142872
152971
163070
173169
183367
193367
203565
213565
223664
233763
243763
253862
263862
273961
283961
294060
304060

Chance of precipitation in September

Any precipitation

Nghi Sơn gets around 293 mm of rain over 19.4 wet days in September, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 65% and peaks near 68% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
168
268
368
468
568
668
768
868
967
1067
1167
1267
1367
1466
1566
1665
1765
1864
1964
2063
2163
2262
2362
2462
2562
2661
2761
2861
2961
3061

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 78% 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
301693
401792
501891
601891
701990
8021088
9021088
10021187
11131284
12131383
13131482
14141580
15141679
16141778
17151876
18151975
19162073
20162172
21162271
22172369
23172468
24172567
25282664
26282763
27292861
28292861
293102958
303103057

Wind in September

Winds average 9 km/h in September, the calmest month.

Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

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 5:51 AM, and sunset from 6:08 PM to 5:41 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:456:08
212.45:456:07
312.35:456:06
412.35:456:05
512.35:466:04
612.35:466:04
712.35:466:03
812.35:466:02
912.25:466:01
1012.25:476:00
1112.25:475:59
1212.25:475:58
1312.25:475:57
1412.15:475:56
1512.15:485:55
1612.15:485:54
1712.15:485:53
1812.15:485:52
1912.15:485:51
2012.05:495:51
2112.05:495:50
2212.05:495:49
2312.05:495:48
2412.05:495:47
2511.95:505:46
2611.95:505:45
2711.95:505:44
2811.95:505:43
2911.95:505:42
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 4.49 kWh/m².

For context, solar energy here swings from a low near 2.67 kWh/m² to a high of 5.72 kWh/m² in May across the year — September's 4.49 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.7Bright
24.7Bright
34.7Bright
44.6Bright
54.6Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.5Bright
144.5Bright
154.4Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.4Bright
214.4Bright
224.4Bright
234.4Bright
244.4Bright
254.4Bright
264.4Bright
274.4Bright
284.3Bright
294.3Bright
304.3Bright
Planning a trip in September

Hazard calendar for Nghi Sơn

In seasonPeak

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

Nghi Sơn sits in the Pacific typhoon belt; the season peaks July–October.

Nghi Sơn's monsoon runs July–October, 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 Nghi Sơn?

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
5.0
Beach & pool
8th-best month of the year

September is a weaker month for outdoor sightseeing in Nghi Sơn.

What to pack for Nghi Sơn in September

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

In September, Nghi Sơn sees daytime highs around 31°C and nights near 26°C. Pack light clothes and rain gear. About 19 days see rain.

light clothesrain gear

Sea temperature near Nghi Sơn in September

The nearest coast averages about 30°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 30°C and coldest in February near 21°C.

The water stays above 20°C all year — warm enough for a swim any month.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan21Refreshing
Feb21Refreshing
Mar22Refreshing
Apr24Warm
May28Warm
Jun30Tropical
Jul30Tropical
Aug30Tropical
Sep30Tropical
Oct28Warm
Nov26Warm
Dec23Refreshing

UV index in Nghi Sơn in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nghi Sơn peaks around August 10 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 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 highHighAug 10UV 12Dec 16UV 6
UV index (midday)Level
Jan7Very high
Feb9Very high
Mar10Very high
Apr9Very high
May11Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep10Extreme
Oct10Very high
Nov7Very high
Dec6High

Air quality in Nghi Sơn 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 Nghi Sơn is worst in April — around 65 µg/m³ PM2.5 (unhealthy), about 3.3× the cleanest month (July, 20 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecUnhealthyPoorModeratePoorUnhealthyApr 1065 µg/m³Jul 1920 µg/m³
PM2.5 (µg/m³)Level
Jan65Unhealthy
Feb63Unhealthy
Mar63Unhealthy
Apr65Unhealthy
May43Poor
Jun25Moderate
Jul20Moderate
Aug23Moderate
Sep33Moderate
Oct46Poor
Nov55Poor
Dec64Unhealthy
Location & terrain

Where is Nghi Sơn?

Nghi Sơn sits at 19.3°N, 105.8°E, 74 m above sea level, in Vietnam. The nearest listed city is Hoàng Mai, 13 km away.

Topography around Nghi Sơn

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

Within 3 km, the terrain around Nghi Sơn has only modest variations in elevation — a maximum elevation change of 159 m around an average of 7 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 507 m; within 80 km, large variations in elevation — a maximum elevation change of 1,068 m.

The land around Nghi Sơn is covered by water (66%) within 3 km, water (65%) and trees (21%) within 16 km, and trees (40%) and water (38%) within 80 km.

3 km
159 m
16 km
507 m
80 km
1,068 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hoàng Mai 13 km · Diễn Thành 45 km · Sầm Sơn 46 km · Thanh Hóa 53 km · Kim Liên 72 km · Vinh 74 km · Nghi Xuân 75 km · Yên Vinh 75 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 Nghi Sơn (19.3275°, 105.8214°, elevation 74 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). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).