Cái Đôi Vàm weather in September

In September, Cái Đôi Vàm sees average daytime highs of 28°C and overnight lows near 26°C, with 309 mm of rain across 27.1 wet days and about 12.1 hours of daylight. It is the 9th-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 28°C through the month. The sky is clear or mostly clear about 3% 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 Cái Đôi Vàm's 12th-clearest and 6th-windiest month. For the whole year in context, see Cái Đôi Vàm's year-round climate.

Daytime high
28°
9th warmest
Overnight low
26°
7th coldest
Rainfall
309 mm
27.1 wet days
Daylight
12 hours
5:54 AM – 5:57 PM
Cloud cover
87%
12th clearest
Wind
16 km/h
6th windiest
Solar energy
4.75 kWh/m²
Travel score
3.2
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 28°C through the month.

A typical September day in Cái Đôi Vàm reaches about 28°C in the afternoon and slips back to 26°C overnight — a 2°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
112926
122826
132826
142826
152826
162826
172826
182826
192826
202826
212826
222826
232826
242826
252826
262826
272826
282826
292826
302826

How September really feels in Cái Đôi Vàm

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.

Cái Đôi Vàm weather by month

How September compares with the rest of the year at a glance. September is the 9th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan28° / 25°315.211.56.5
Feb29° / 25°132.411.76.6
Mar30° / 26°37611.95.7
Apr30° / 27°8513.212.24.5
May30° / 27°21325.212.43.1
Jun29° / 27°25926.512.53.1
Jul29° / 26°28128.212.53.1
Aug29° / 26°26827.612.33.2
Sep28° / 26°30927.112.13.2
Oct28° / 26°3552911.83.2
Nov29° / 26°20622.211.63.9
Dec28° / 25°10112.411.55.4

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 7% of September, with mostly cloudy or overcast conditions the remaining 89%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11090
21189
31189
41189
51189
61189
71189
81189
91189
101189
111189
121090
131090
141189
151189
161189
171189
181189
191189
201189
211189
221189
231189
241189
251189
261090
27991
28991
29991
30991

Chance of precipitation in September

Any precipitation

Cái Đôi Vàm gets around 309 mm of rain over 27.1 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 90% and peaks near 93% on the wettest days.

0%20%40%60%80%100%151015202530
Rain chance (%)
190
289
389
489
589
689
789
889
989
1090
1190
1290
1390
1490
1590
1690
1790
1890
1990
2090
2191
2291
2391
2491
2592
2692
2792
2893
2993
3093

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 89% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Oppressive (%)Miserable (%)
11189
21189
31189
41189
51288
61288
71288
81288
91288
101288
111288
121288
131288
141288
151189
161189
171189
181090
191090
201090
21991
22991
23991
24991
251090
261090
271090
281189
291288
301288

Wind in September

Winds average 16 km/h in September.

Across September, daily wind ranges from about 14 km/h on the calmest days to 17 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
117light breeze
217light breeze
317light breeze
417light breeze
517light breeze
617light breeze
717light breeze
817light breeze
917light breeze
1017light breeze
1117light breeze
1217light breeze
1317light breeze
1417light breeze
1517light breeze
1617light breeze
1717light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2515light breeze
2615light breeze
2715light breeze
2815light breeze
2915light 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 5:55 AM to 5:52 AM, and sunset from 6:06 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.25:556:06
212.25:556:05
312.25:556:04
412.15:556:04
512.15:556:03
612.15:556:03
712.15:556:02
812.15:556:01
912.15:546:01
1012.15:546:00
1112.15:546:00
1212.15:545:59
1312.15:545:58
1412.15:545:58
1512.15:545:57
1612.05:545:57
1712.05:545:56
1812.05:535:55
1912.05:535:55
2012.05:535:54
2112.05:535:53
2212.05:535:53
2312.05:535:52
2412.05:535:52
2512.05:535:51
2612.05:525:50
2712.05:525:50
2811.95:525:49
2911.95:525:49
3011.95:525:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.75 kWh/m².

For context, solar energy here swings from a low near 4.46 kWh/m² to a high of 6.31 kWh/m² in March across the year — September's 4.75 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.0Bright
45.0Bright
54.9Bright
64.9Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.8Bright
124.8Bright
134.8Bright
144.7Bright
154.7Bright
164.7Bright
174.7Bright
184.7Bright
194.7Bright
204.7Bright
214.6Bright
224.6Bright
234.6Bright
244.6Bright
254.6Bright
264.6Bright
274.6Bright
284.6Bright
294.5Bright
304.5Bright
Planning a trip in September

Hazard calendar for Cái Đôi Vàm

In seasonPeak

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

Cái Đôi Vàm sits in the Pacific typhoon belt; the season peaks July–October.

Cái Đôi Vàm'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 Cái Đôi Vàm?

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

3.2
Sightseeing
7th-best month of the year
3.9
Beach & pool
11th-best month of the year

September is a weaker month for outdoor sightseeing in Cái Đôi Vàm.

What to pack for Cái Đôi Vàm in September

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

In September, Cái Đôi Vàm sees daytime highs around 28°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

Sea temperature near Cái Đôi Vàm 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 21 km away) is warmest in May at about 30°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
Feb27Warm
Mar28Tropical
Apr30Tropical
May30Tropical
Jun30Tropical
Jul29Tropical
Aug29Tropical
Sep29Tropical
Oct29Tropical
Nov29Tropical
Dec28Warm

UV index in Cái Đôi Vàm 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 Cái Đôi Vàm peaks around March 20 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 10 (extreme).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeMar 20UV 13Dec 16UV 10
UV index (midday)Level
Jan11Extreme
Feb12Extreme
Mar13Extreme
Apr13Extreme
May13Extreme
Jun12Extreme
Jul11Extreme
Aug13Extreme
Sep13Extreme
Oct11Extreme
Nov11Extreme
Dec10Very high

Air quality in Cái Đôi Vàm 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 Cái Đôi Vàm is worst in December — around 22 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (May, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateDec 1922 µg/m³May 2012 µg/m³
PM2.5 (µg/m³)Level
Jan19Moderate
Feb17Moderate
Mar15Moderate
Apr14Moderate
May12Good
Jun13Moderate
Jul15Moderate
Aug13Moderate
Sep14Moderate
Oct15Moderate
Nov18Moderate
Dec22Moderate
Location & terrain

Where is Cái Đôi Vàm?

Cái Đôi Vàm sits at 8.9°N, 104.8°E, 2 m above sea level, in Vietnam. The nearest listed city is Hưng Mỹ, 19 km away.

Topography around Cái Đôi Vàm

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cái Đôi Vàm.

Within 3 km, the terrain around Cái Đôi Vàm has only modest variations in elevation — a maximum elevation change of 11 m around an average of 2 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 17 m; within 80 km, significant variations in elevation — a maximum elevation change of 285 m.

The land around Cái Đôi Vàm is covered by water (34%) and mangroves (32%) within 3 km, water (62%) within 16 km, and water (78%) within 80 km.

3 km
11 m
16 km
17 m
80 km
285 m
treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmangroves
September weather nearby: Hưng Mỹ 19 km · Năm Căn 23 km · Trần Văn Thời 31 km · Tam Giang 41 km · Cà Mau 52 km · Thới Bình 64 km · An Trạch 68 km · Gành Hào 70 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 Cái Đôi Vàm (8.8571°, 104.812°, elevation 2 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).