Rạch Giá weather in September

In September, Rạch Giá sees average daytime highs of 29°C and overnight lows near 26°C, with 353 mm of rain across 27.7 wet days and about 12.1 hours of daylight. It is the 11th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 2% 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 Rạch Giá's 12th-clearest and 3rd-windiest month. For the whole year in context, see Rạch Giá's year-round climate.

Daytime high
29°
11th warmest
Overnight low
26°
7th coldest
Rainfall
353 mm
27.7 wet days
Daylight
12 h 06 min
5:52 AM – 5:56 PM
Cloud cover
88%
12th clearest
Wind
17 km/h
3rd windiest
Solar energy
4.37 kWh/m²
Travel score
3.1
out of 10

Rạch Giá is the former provincial capital of the former Kien Giang province, Vietnam.

Density
4,422/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 29°C through the month.

A typical September day in Rạch Giá reaches about 29°C in the afternoon and slips back to 26°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 30°C. Set against its neighbours, September runs on par with August and on par with October.

24°26°28°30°32°151015202530
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112826
122826
132826
142826
152826
162826
172826
182826
192826
202926
212926
222926
232926
242926
252926
262926
272926
282926
292926
302926

How September really feels in Rạch Giá

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.

Rạch Giá weather by month

How September compares with the rest of the year at a glance. September is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan29° / 24°224.511.56.1
Feb30° / 24°122.511.75.8
Mar31° / 26°376.811.94.7
Apr32° / 27°8814.612.23.7
May30° / 27°24426.412.52.9
Jun29° / 27°31627.612.63.0
Jul29° / 26°34428.612.53.1
Aug29° / 26°32628.312.33.2
Sep29° / 26°35327.712.13.1
Oct29° / 26°30227.811.83.1
Nov30° / 25°12017.111.54.2
Dec29° / 24°579.111.45.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 2% of the time in September, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 7% of September, with mostly cloudy or overcast conditions the remaining 91%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1892
2892
3793
4892
5892
6892
7892
8892
9892
10892
11892
12892
13892
14892
15892
16892
17892
181090
191090
201090
211090
221090
231090
241090
251090
261090
27991
28991
29991
30991

Chance of precipitation in September

Any precipitation

Rạch Giá gets around 353 mm of rain over 27.7 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 93% and peaks near 94% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
192
292
391
491
591
691
792
892
992
1092
1192
1292
1393
1493
1593
1693
1793
1893
1993
2093
2193
2293
2393
2493
2593
2693
2794
2894
2994
3094

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 (%)
11189
21288
31288
41288
51288
61288
71288
81288
91288
101387
111387
121387
131387
141387
151387
161387
171387
181387
191387
201486
211486
221486
231585
241684
251783
261783
271882
281981
292080
302278

Wind in September

Winds average 17 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 18 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
118light breeze
218light breeze
318light breeze
418light breeze
518light breeze
618light breeze
718light breeze
818light breeze
918light breeze
1018light breeze
1118light breeze
1218light breeze
1318light breeze
1418light breeze
1517light breeze
1617light breeze
1717light breeze
1817light breeze
1917light breeze
2017light breeze
2116light breeze
2216light breeze
2316light breeze
2415light breeze
2515light breeze
2615light breeze
2715light breeze
2814light breeze
2914light breeze
3014light breeze

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 5:54 AM to 5:51 AM, and sunset from 6:05 PM to 5:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:546:05
212.25:536:05
312.25:536:04
412.25:536:03
512.25:536:03
612.15:536:02
712.15:536:01
812.15:536:01
912.15:536:00
1012.15:536:00
1112.15:535:59
1212.15:535:58
1312.15:535:58
1412.15:535:57
1512.15:525:56
1612.15:525:56
1712.05:525:55
1812.05:525:54
1912.05:525:54
2012.05:525:53
2112.05:525:52
2212.05:525:52
2312.05:525:51
2412.05:525:50
2512.05:525:50
2612.05:525:49
2712.05:515:49
2811.95:515:48
2911.95:515:47
3011.95:515:47

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.37 kWh/m².

For context, solar energy here swings from a low near 4.3 kWh/m² to a high of 5.98 kWh/m² in March across the year — September's 4.37 kWh/m² sits near the bottom.

024151015202530
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.4Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.3Bright
264.3Bright
274.3Bright
284.3Bright
294.2Bright
304.2Bright
Planning a trip in September

Hazard calendar for Rạch Giá

In seasonPeak

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

Rạch Giá sits in the Pacific typhoon belt; the season peaks July–October.

Rạch Giá's monsoon runs May–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 Rạch Giá?

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

3.1
Sightseeing
8th-best month of the year
3.8
Beach & pool
12th-best month of the year

September is a weaker month for outdoor sightseeing in Rạch Giá.

What to pack for Rạch Giá in September

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

In September, Rạch Giá sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

Sea temperature near Rạch Giá 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 26 km away) is warmest in May at about 31°C and coldest in January near 27°C.

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

26°28°30°32°JanFebMarAprMayJunJulAugSepOctNovDecwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan27Warm
Feb28Warm
Mar29Tropical
Apr30Tropical
May31Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Rạch Giá 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 Rạch Giá peaks around August 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 21UV 13Dec 15UV 9
UV index (midday)Level
Jan10Very high
Feb11Extreme
Mar12Extreme
Apr12Extreme
May12Extreme
Jun12Extreme
Jul12Extreme
Aug13Extreme
Sep13Extreme
Oct9Very high
Nov9Very high
Dec9Very high

Air quality in Rạch Giá 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 Rạch Giá is worst in January — around 45 µg/m³ PM2.5 (poor), about 2.4× the cleanest month (August, 19 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorJan 145 µg/m³Aug 1519 µg/m³
PM2.5 (µg/m³)Level
Jan45Poor
Feb37Poor
Mar33Moderate
Apr32Moderate
May27Moderate
Jun22Moderate
Jul22Moderate
Aug19Moderate
Sep23Moderate
Oct32Moderate
Nov42Poor
Dec45Poor
Location & terrain

Where is Rạch Giá?

Rạch Giá sits at 10.0°N, 105.1°E, 13 m above sea level, in Vietnam. The nearest listed city is Xóm Cái Nước, 24 km away.

Topography around Rạch Giá

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

Within 3 km, the terrain around Rạch Giá has only modest variations in elevation — a maximum elevation change of 13 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 13 m; within 80 km, large variations in elevation — a maximum elevation change of 691 m.

The land around Rạch Giá is covered by water (33%) and artificial surfaces (30%) within 3 km, cropland (49%) and water (35%) within 16 km, and cropland (51%) and water (32%) within 80 km.

3 km
13 m
16 km
13 m
80 km
691 m
treesgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Xóm Cái Nước 24 km · Kiên Hải 26 km · Óc Eo 27 km · Núi Sập 35 km · Cô Tô 38 km · Cờ Đỏ 39 km · Vĩnh Thạnh 42 km · Vị Thanh 50 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 Rạch Giá (10.0124°, 105.0809°, elevation 13 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).