Nha Trang weather in September

In September, Nha Trang sees average daytime highs of 30°C and overnight lows near 27°C, with 177 mm of rain across 24.2 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 30°C through the month. The sky is clear or mostly clear about 8% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 12 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Nha Trang's 12th-clearest and 12th-windiest month. For the whole year in context, see Nha Trang's year-round climate.

Daytime high
30°
5th warmest
Overnight low
27°
8th coldest
Rainfall
177 mm
24.2 wet days
Daylight
12 h 06 min
5:36 AM – 5:40 PM
Cloud cover
81%
12th clearest
Wind
6 km/h
12th windiest
Solar energy
5.19 kWh/m²
Travel score
3.1
out of 10

Nha Trang is city of Vietnam, capital of the Khánh Hòa Province.

Air quality
Excellent
PM10 14 µg/m³ · 2015
Density
2,307/km²
people per km²
Founded
1977

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 30°C through the month.

A typical September day in Nha Trang reaches about 30°C in the afternoon and slips back to 27°C overnight — a 4°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 31°C. Set against its neighbours, September runs about 1°C cooler than August and about 2°C warmer than October.

25°28°30°33°35°151015202530
Avg high (°C)Avg low (°C)
13127
23127
33127
43127
53127
63127
73127
83027
93027
103027
113027
123027
133027
143027
153027
163027
173027
183026
193026
203026
213026
223026
233026
243026
253026
263026
272926
282926
292926
302926

How September really feels in Nha Trang

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
heat index over the day's high
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.

Nha Trang 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
Jan25° / 22°9012.111.46.4
Feb26° / 23°397.311.67.0
Mar28° / 24°508.411.96.5
Apr30° / 26°528.812.35.4
May31° / 27°10216.112.63.8
Jun31° / 27°8617.512.73.4
Jul31° / 27°8920.512.63.4
Aug31° / 27°9820.112.43.3
Sep30° / 27°17724.212.13.1
Oct28° / 25°28025.111.73.8
Nov27° / 24°33221.211.44.7
Dec26° / 23°27619.411.35.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 82%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12179
22080
32080
41981
51981
61783
71783
81684
91684
101684
111585
121585
131585
141585
151585
161585
171684
181684
191783
201783
211981
221981
232080
242080
252179
262179
272278
282476
292476
302575

Chance of precipitation in September

Any precipitation

Nha Trang gets around 177 mm of rain over 24.2 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 81% and peaks near 85% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
172
273
373
474
575
676
777
878
979
1080
1181
1282
1382
1483
1584
1684
1785
1885
1985
2085
2184
2284
2384
2484
2584
2684
2784
2884
2984
3084

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 86% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
1793
2793
3892
4892
5991
6991
71090
81090
91090
101189
111189
121189
131189
141288
151288
161288
171387
181387
191387
201486
211486
221585
231684
241882
251981
262179
272377
282575
292773
302971

Wind in September

Winds average 6 km/h in September, the calmest month.

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
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 12 min at the start of September to 11 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over September. Sunrise moves from 5:36 AM to 5:35 AM, and sunset from 5:50 PM to 5:30 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:365:50
212.25:365:49
312.25:365:49
412.25:365:48
512.25:365:47
612.25:365:47
712.25:365:46
812.25:365:45
912.15:365:45
1012.15:365:44
1112.15:365:43
1212.15:365:42
1312.15:365:42
1412.15:365:41
1512.15:365:40
1612.15:365:40
1712.15:365:39
1812.05:355:38
1912.05:355:37
2012.05:355:37
2112.05:355:36
2212.05:355:35
2312.05:355:35
2412.05:355:34
2512.05:355:33
2612.05:355:32
2711.95:355:32
2811.95:355:31
2911.95:355:30
3011.95:355:30

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.19 kWh/m².

For context, solar energy here swings from a low near 3.41 kWh/m² to a high of 6.31 kWh/m² in April across the year — September's 5.19 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.6Bright
25.6Bright
35.6Bright
45.5Bright
55.5Bright
65.5Bright
75.4Bright
85.4Bright
95.3Bright
105.3Bright
115.3Bright
125.2Bright
135.2Bright
145.2Bright
155.1Bright
165.1Bright
175.1Bright
185.1Bright
195.0Bright
205.0Bright
215.0Bright
225.0Bright
235.0Bright
245.0Bright
255.0Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
Planning a trip in September

Hazard calendar for Nha Trang

In seasonPeak

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

Nha Trang sits in the Pacific typhoon belt; the season peaks July–October.

Nha Trang's monsoon runs September–December, 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 Nha Trang?

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

3.1
Sightseeing
12th-best month of the year
4.3
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Nha Trang.

What to pack for Nha Trang in September

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

In September, Nha Trang sees daytime highs around 30°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Nha Trang in September

The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 24 km away) is warmest in May at about 29°C and coldest in January near 25°C.

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

24°26°28°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan25Warm
Feb25Warm
Mar26Warm
Apr28Warm
May29Tropical
Jun29Tropical
Jul28Tropical
Aug28Tropical
Sep29Tropical
Oct28Tropical
Nov27Warm
Dec26Warm

UV index in Nha Trang in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Nha Trang peaks around August 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 9 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highAug 18UV 13Dec 16UV 9
UV index (midday)Level
Jan10Extreme
Feb12Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep12Extreme
Oct12Extreme
Nov10Very high
Dec8Very high

Air quality in Nha Trang 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 Nha Trang is worst in July — around 19 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateJul 1718 µg/m³Nov 1713 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb15Moderate
Mar15Moderate
Apr16Moderate
May15Moderate
Jun18Moderate
Jul19Moderate
Aug18Moderate
Sep16Moderate
Oct15Moderate
Nov13Moderate
Dec15Moderate
Location & terrain

Where is Nha Trang?

Nha Trang sits at 12.2°N, 109.2°E, 10 m above sea level, in Vietnam. The nearest listed city is Ninh Hòa, 28 km away.

Tuy HòaĐưc Trọng

Topography around Nha Trang

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

Within 3 km, the terrain around Nha Trang has only modest variations in elevation — a maximum elevation change of 169 m around an average of 6 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 959 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,277 m.

The land around Nha Trang is covered by water (42%) and artificial surfaces (39%) within 3 km, water (41%) and trees (39%) within 16 km, and trees (49%) and water (39%) within 80 km.

3 km
169 m
16 km
959 m
80 km
2,277 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ninh Hòa 28 km · Cam Ranh 36 km · Tu Bông 59 km · Khánh Hải 75 km · Phan Rang-Tháp Chàm 79 km · Da Lat 88 km · Tuy Hòa 96 km · Đưc Trọng 106 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 Nha Trang (12.2451°, 109.1943°, elevation 10 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).