Phan Thiết weather in September

In September, Phan Thiết sees average daytime highs of 30°C and overnight lows near 24°C, with 239 mm of rain across 26.1 wet days and about 12.1 hours of daylight. It is the 6th-warmest and 2nd-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 3% of the time in September, and the air most often feels oppressive.

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 Phan Thiết's 12th-clearest and 7th-windiest month. For the whole year in context, see Phan Thiết's year-round climate.

Daytime high
30°
6th warmest
Overnight low
24°
7th coldest
Rainfall
239 mm
26.1 wet days
Daylight
12 h 06 min
5:40 AM – 5:44 PM
Cloud cover
85%
12th clearest
Wind
9 km/h
7th windiest
Solar energy
5.09 kWh/m²
Travel score
3.0
out of 10

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 Phan Thiết reaches about 30°C in the afternoon and slips back to 24°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 31°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)
13024
23024
33024
43024
53024
63024
73024
83024
93024
103024
113024
123024
133024
143024
153024
163024
173024
183024
193024
203024
213024
223024
233024
243024
253024
263024
273024
283024
293024
303024

How September really feels in Phan Thiết

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.

Phan Thiết weather by month

How September compares with the rest of the year at a glance. September is the 6th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 21°182.311.46.3
Feb30° / 21°71.411.66.2
Mar31° / 23°27511.95.4
Apr31° / 24°7012.612.24.1
May31° / 25°18825.512.52.8
Jun30° / 25°21225.812.62.9
Jul30° / 24°21327.212.63.0
Aug30° / 24°2112712.43.0
Sep30° / 24°23926.112.13.0
Oct30° / 24°26025.611.83.3
Nov30° / 23°11312.811.54.8
Dec29° / 22°687.411.45.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 3% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11486
21387
31387
41387
51387
61387
71387
81189
91189
101189
111189
121189
131090
141090
15991
16991
17991
181090
191189
201189
211189
221189
231288
241288
251288
261288
271288
281288
291288
301288

Chance of precipitation in September

Any precipitation

Phan Thiết gets around 239 mm of rain over 26.1 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 88% and peaks near 92% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%100%151015202530
Rain chance (%)
184
284
384
484
584
684
785
885
986
1087
1187
1288
1388
1488
1588
1688
1788
1888
1988
2089
2189
2289
2389
2490
2590
2690
2791
2891
2992
3092

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the oppressive band about 70% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
16832
26931
37030
47129
57129
67228
77228
87327
97327
107327
117327
127228
137228
147228
157228
167228
177129
187129
197030
206931
216931
226832
236832
246832
256832
266832
276832
286832
296931
306931

Wind in September

Winds average 9 km/h in September.

Across September, daily wind ranges from about 7 km/h on the calmest days to 9 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
178calm
188calm
198calm
208calm
218calm
228calm
238calm
248calm
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 5:41 AM to 5:39 AM, and sunset from 5:54 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:415:54
212.25:415:53
312.25:415:52
412.25:415:52
512.25:415:51
612.25:415:50
712.25:415:50
812.15:415:49
912.15:415:48
1012.15:405:48
1112.15:405:47
1212.15:405:46
1312.15:405:46
1412.15:405:45
1512.15:405:44
1612.15:405:44
1712.05:405:43
1812.05:405:42
1912.05:405:42
2012.05:405:41
2112.05:405:40
2212.05:405:40
2312.05:405:39
2412.05:405:38
2512.05:405:38
2612.05:405:37
2711.95:405:36
2811.95:405:36
2911.95:395:35
3011.95:395:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.09 kWh/m².

For context, solar energy here swings from a low near 4.71 kWh/m² to a high of 6.54 kWh/m² in March across the year — September's 5.09 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.4Bright
25.4Bright
35.3Bright
45.3Bright
55.3Bright
65.3Bright
75.2Bright
85.2Bright
95.2Bright
105.2Bright
115.1Bright
125.1Bright
135.1Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
185.0Bright
195.0Bright
205.0Bright
215.0Bright
224.9Bright
234.9Bright
244.9Bright
254.9Bright
264.9Bright
274.9Bright
284.9Bright
294.9Bright
304.9Bright
Planning a trip in September

Hazard calendar for Phan Thiết

In seasonPeak

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

Phan Thiết sits in the Pacific typhoon belt; the season peaks July–October.

Phan Thiết's rainy season runs May–October, 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 Phan Thiết?

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

3.0
Sightseeing
8th-best month of the year
4.0
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Phan Thiết.

What to pack for Phan Thiết in September

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

In September, Phan Thiết sees daytime highs around 30°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 26 days see rain.

light clothesrain gearsun protection

Sea temperature near Phan Thiết in September

The nearest coast averages about 28°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 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
Mar27Warm
Apr28Tropical
May29Tropical
Jun28Tropical
Jul28Tropical
Aug28Warm
Sep28Tropical
Oct28Tropical
Nov27Warm
Dec26Warm

UV index in Phan Thiết 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 Phan Thiết peaks around May 10 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 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 highMay 10UV 13Dec 13UV 9
UV index (midday)Level
Jan11Extreme
Feb12Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun11Extreme
Jul12Extreme
Aug12Extreme
Sep13Extreme
Oct11Extreme
Nov10Very high
Dec9Very high

Air quality in Phan Thiết 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 Phan Thiết is worst in October — around 32 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateOct 1432 µg/m³Feb 1123 µg/m³
PM2.5 (µg/m³)Level
Jan24Moderate
Feb23Moderate
Mar26Moderate
Apr28Moderate
May28Moderate
Jun29Moderate
Jul26Moderate
Aug26Moderate
Sep30Moderate
Oct32Moderate
Nov28Moderate
Dec26Moderate
Location & terrain

Where is Phan Thiết?

Phan Thiết sits at 10.9°N, 108.1°E, 10 m above sea level, in Vietnam. The nearest listed city is Mui Ne, 20 km away.

Đưc TrọngXuân Lộc

Topography around Phan Thiết

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

Within 3 km, the terrain around Phan Thiết has only modest variations in elevation — a maximum elevation change of 44 m around an average of 4 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 361 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,844 m.

The land around Phan Thiết is covered by artificial surfaces (44%) and water (33%) within 3 km, water (37%), trees (30%) and grassland (21%) within 16 km, and trees (46%) and water (36%) within 80 km.

3 km
44 m
16 km
361 m
80 km
1,844 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Mui Ne 20 km · La Gi 47 km · Ấp Bình Châu 74 km · Bảo Lộc 76 km · Thị Trấn Phước Bửu 88 km · Long Khánh 93 km · Đưc Trọng 94 km · Xuân Lộc 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 Phan Thiết (10.9289°, 108.1021°, 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).