Ngã Năm weather in September

In September, Ngã Năm sees average daytime highs of 31°C and overnight lows near 25°C, with 317 mm of rain across 28.9 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 2nd-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 1% 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 Ngã Năm's 12th-clearest and 6th-windiest month. For the whole year in context, see Ngã Năm's year-round climate.

Daytime high
31°
8th warmest
Overnight low
25°
7th coldest
Rainfall
317 mm
28.9 wet days
Daylight
12 h 06 min
5:50 AM – 5:53 PM
Cloud cover
89%
12th clearest
Wind
10 km/h
6th windiest
Solar energy
4.31 kWh/m²
Travel score
2.4
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 Ngã Năm 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 33°C. Set against its neighbours, September runs on par with August and on par with October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13125
23125
33125
43125
53125
63125
73125
83125
93125
103125
113125
123125
133125
143125
153125
163125
173125
183125
193125
203125
213125
223125
233125
243125
253125
263125
273125
283125
293125
303125

How September really feels in Ngã Năm

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.

Ngã Năm weather by month

How September compares with the rest of the year at a glance. September is the 8th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan30° / 23°264.511.55.3
Feb31° / 24°132.411.75.0
Mar33° / 25°456.511.93.9
Apr34° / 26°9113.812.22.9
May33° / 26°24126.712.42.1
Jun32° / 25°28027.912.52.3
Jul31° / 25°28729.712.52.4
Aug31° / 25°27929.312.32.4
Sep31° / 25°31728.912.12.4
Oct31° / 24°34328.211.82.6
Nov30° / 24°17419.911.63.5
Dec30° / 24°8810.911.54.8

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 5% of September, with mostly cloudy or overcast conditions the remaining 94%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2892
3892
4892
5793
6694
7694
8793
9793
10793
11793
12694
13694
14694
15694
16694
17694
18694
19694
20694
21694
22694
23694
24694
25793
26793
27793
28793
29793
30694

Chance of precipitation in September

Any precipitation

Ngã Năm gets around 317 mm of rain over 28.9 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 96% and peaks near 96% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
195
295
395
496
596
696
796
896
996
1096
1196
1296
1396
1496
1596
1696
1796
1896
1996
2096
2196
2296
2396
2496
2596
2696
2796
2896
2996
3096

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 84% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
11585
21585
31684
41684
51783
61783
71882
81882
91882
101981
111981
121981
131981
141981
151981
161882
171882
181783
191783
201684
211684
221585
231486
241486
251486
261387
271387
281387
291387
301486

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 8 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
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
308calm

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 5:52 AM to 5:49 AM, and sunset from 6:03 PM to 5:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:526:03
212.25:526:02
312.25:526:02
412.25:526:01
512.25:516:00
612.15:516:00
712.15:515:59
812.15:515:59
912.15:515:58
1012.15:515:57
1112.15:515:57
1212.15:515:56
1312.15:515:55
1412.15:515:55
1512.15:505:54
1612.15:505:53
1712.05:505:53
1812.05:505:52
1912.05:505:52
2012.05:505:51
2112.05:505:50
2212.05:505:50
2312.05:505:49
2412.05:505:48
2512.05:505:48
2612.05:495:47
2712.05:495:47
2811.95:495:46
2911.95:495:45
3011.95:495:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.31 kWh/m².

For context, solar energy here swings from a low near 4.11 kWh/m² to a high of 5.94 kWh/m² in March across the year — September's 4.31 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.4Bright
94.4Bright
104.4Bright
114.3Bright
124.3Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.2Bright
184.2Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.1Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Ngã Năm

In seasonPeak

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

Ngã Năm sits in the Pacific typhoon belt; the season peaks July–October.

Ngã Năm's rainy season runs May–November, when most of the year's rain falls.

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

Is September a good time to visit Ngã Năm?

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

2.4
Sightseeing
8th-best month of the year
3.5
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Ngã Năm.

What to pack for Ngã Năm in September

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

In September, Ngã Năm sees daytime highs around 31°C and nights near 25°C. Pack light clothes and rain gear. About 29 days see rain.

light clothesrain gear

Sea temperature near Ngã Năm 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 49 km away) is warmest in May at about 30°C and coldest in January near 26°C.

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

24°26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan26Warm
Feb26Warm
Mar28Warm
Apr29Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov28Tropical
Dec27Warm

UV index in Ngã Năm in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ngã Năm peaks around March 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 10 (very high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeVery highMar 22UV 13Jan 1UV 10
UV index (midday)Level
Jan10Very high
Feb12Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct10Extreme
Nov10Very high
Dec10Very high

Air quality in Ngã Năm 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 Ngã Năm is worst in December — around 57 µg/m³ PM2.5 (unhealthy), about 2.1× the cleanest month (August, 27 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorUnhealthyDec 1556 µg/m³Aug 1327 µg/m³
PM2.5 (µg/m³)Level
Jan51Poor
Feb40Poor
Mar38Poor
Apr39Poor
May37Poor
Jun32Moderate
Jul30Moderate
Aug27Moderate
Sep35Poor
Oct49Poor
Nov53Poor
Dec57Unhealthy
Location & terrain

Where is Ngã Năm?

Ngã Năm sits at 9.6°N, 105.6°E, 1 m above sea level, in Vietnam. The nearest listed city is Long Mỹ, 13 km away.

Topography around Ngã Năm

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

Within 3 km, the terrain around Ngã Năm has only modest variations in elevation — a maximum elevation change of 10 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 12 m; within 80 km, only modest variations in elevation — a maximum elevation change of 21 m.

The land around Ngã Năm is covered by cropland (77%) within 3 km, cropland (80%) within 16 km, and cropland (46%) and water (31%) within 80 km.

3 km
10 m
16 km
12 m
80 km
21 m
treesgrasslandcroplandartificial surfaceswatermangroves
September weather nearby: Long Mỹ 13 km · Phú Lộc 22 km · Vị Thanh 28 km · Ấp Một 32 km · Bạc Liêu 33 km · Ngã Bảy 37 km · Phong Thạnh 39 km · Giá Rai 40 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 Ngã Năm (9.5651°, 105.599°, elevation 1 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).