Cao Lãnh weather in September

In September, Cao Lãnh sees average daytime highs of 32°C and overnight lows near 25°C, with 277 mm of rain across 28.2 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 32°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 Cao Lãnh's 12th-clearest and 4th-windiest month. For the whole year in context, see Cao Lãnh's year-round climate.

Daytime high: 32°; 6th warmest
Overnight low: 25°; 7th coldest
Rainfall: 277 mm; 28.2 wet days
Daylight: 12 h 06 min; 5:50 AM – 5:54 PM
Cloud cover: 90%; 12th clearest
Wind: 10 km/h; 4th windiest
Solar energy: 4.44 kWh/m²
Travel score: 2.2; out of 10

Cao Lãnh is provincial city of Dong Thap, Viet Nam.

Density: 1,980/km²; people per km²

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← August Cao Lãnh year-round climate October →Best places to visit in September

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 32°C through the month.

A typical September day in Cao Lãnh reaches about 32°C in the afternoon and slips back to 25°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, September runs on par with August and on par with October.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Avg high (°C)	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32	32
Avg low (°C)	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

How September really feels in Cao Lãnh

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 feel dangerously hot (≥ 39°C)

Days feeling ≤ 0°C

wind chill below the day's low

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Cao Lãnh 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	31° / 23°	26	4.1	11.5	5.0
Feb	32° / 23°	13	1.9	11.7	4.7
Mar	34° / 25°	31	5.6	11.9	3.5
Apr	35° / 26°	79	12.6	12.2	2.5
May	33° / 26°	179	24.3	12.5	2.1
Jun	32° / 26°	216	26.6	12.6	2.3
Jul	31° / 25°	227	27.9	12.6	2.4
Aug	32° / 25°	240	28.2	12.3	2.3
Sep	32° / 25°	277	28.2	12.1	2.2
Oct	32° / 25°	288	26.9	11.8	2.5
Nov	32° / 24°	140	16.3	11.5	3.5
Dec	31° / 23°	63	8.9	11.4	4.5

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%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Clearer (%)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	6	6	6	6	7	7	7	7	7	7	7	7
Cloudier (%)	95	95	95	95	95	95	95	95	95	95	95	95	95	95	95	95	95	95	94	94	94	94	93	93	93	93	93	93	93	93

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93

Chance of precipitation in September

Any precipitation

Cao Lãnh gets around 277 mm of rain over 28.2 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 94% and peaks near 96% on the wettest days.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Rain chance (%)	92	92	92	92	93	93	93	94	94	94	95	95	95	96	96	96	96	96	96	95	95	95	95	94	94	94	94	94	94	94

	Rain chance (%)
1	92
2	92
3	92
4	92
5	93
6	93
7	93
8	94
9	94
10	94
11	95
12	95
13	95
14	96
15	96
16	96
17	96
18	96
19	96
20	95
21	95
22	95
23	95
24	94
25	94
26	94
27	94
28	94
29	94
30	94

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 87% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Oppressive (%)	12	12	12	13	13	13	14	14	14	14	14	14	14	14	14	14	14	14	13	13	13	13	13	13	13	13	13	12	12	13
Miserable (%)	88	88	88	87	87	87	86	86	86	86	86	86	86	86	86	86	86	86	87	87	87	87	87	87	87	87	87	88	88	87

	Oppressive (%)	Miserable (%)
1	12	88
2	12	88
3	12	88
4	13	87
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	14	86
14	14	86
15	14	86
16	14	86
17	14	86
18	14	86
19	13	87
20	13	87
21	13	87
22	13	87
23	13	87
24	13	87
25	13	87
26	13	87
27	13	87
28	12	88
29	12	88
30	13	87

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 11 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Wind speed (km/h)	11	11	11	11	11	10	10	10	10	10	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	8	8	8	8	8
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	11	calm
2	11	calm
3	11	calm
4	11	calm
5	11	calm
6	10	calm
7	10	calm
8	10	calm
9	10	calm
10	10	calm
11	10	calm
12	10	calm
13	10	calm
14	10	calm
15	10	calm
16	10	calm
17	10	calm
18	10	calm
19	10	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	8	calm
27	8	calm
28	8	calm
29	8	calm
30	8	calm

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 5:51 AM to 5:49 AM, and sunset from 6:03 PM to 5:44 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Daylight (h)	12.2	12.2	12.2	12.2	12.2	12.2	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	11.9	11.9	11.9	11.9
Sunrise (AM)	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:50	5:49	5:49	5:49	5:49	5:49	5:49
Sunset (PM)	6:03	6:03	6:02	6:01	6:01	6:00	5:59	5:59	5:58	5:58	5:57	5:56	5:56	5:55	5:54	5:54	5:53	5:52	5:51	5:51	5:50	5:49	5:49	5:48	5:48	5:47	5:46	5:46	5:45	5:44

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	5:51	6:03
2	12.2	5:51	6:03
3	12.2	5:51	6:02
4	12.2	5:51	6:01
5	12.2	5:51	6:01
6	12.2	5:51	6:00
7	12.1	5:51	5:59
8	12.1	5:51	5:59
9	12.1	5:51	5:58
10	12.1	5:51	5:58
11	12.1	5:50	5:57
12	12.1	5:50	5:56
13	12.1	5:50	5:56
14	12.1	5:50	5:55
15	12.1	5:50	5:54
16	12.1	5:50	5:54
17	12.0	5:50	5:53
18	12.0	5:50	5:52
19	12.0	5:50	5:51
20	12.0	5:50	5:51
21	12.0	5:50	5:50
22	12.0	5:50	5:49
23	12.0	5:50	5:49
24	12.0	5:50	5:48
25	12.0	5:49	5:48
26	12.0	5:49	5:47
27	11.9	5:49	5:46
28	11.9	5:49	5:46
29	11.9	5:49	5:45
30	11.9	5:49	5:44

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.44 kWh/m².

For context, solar energy here swings from a low near 4.3 kWh/m² to a high of 6.01 kWh/m² in March across the year — September's 4.44 kWh/m² sits near the bottom.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
Solar energy (kWh/m²)	4.7	4.7	4.7	4.7	4.6	4.6	4.6	4.6	4.5	4.5	4.5	4.5	4.4	4.4	4.4	4.4	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3	4.3
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.7	Bright
2	4.7	Bright
3	4.7	Bright
4	4.7	Bright
5	4.6	Bright
6	4.6	Bright
7	4.6	Bright
8	4.6	Bright
9	4.5	Bright
10	4.5	Bright
11	4.5	Bright
12	4.5	Bright
13	4.4	Bright
14	4.4	Bright
15	4.4	Bright
16	4.4	Bright
17	4.3	Bright
18	4.3	Bright
19	4.3	Bright
20	4.3	Bright
21	4.3	Bright
22	4.3	Bright
23	4.3	Bright
24	4.3	Bright
25	4.3	Bright
26	4.3	Bright
27	4.3	Bright
28	4.3	Bright
29	4.3	Bright
30	4.3	Bright

Planning a trip in September

Hazard calendar for Cao Lãnh

In seasonPeak

In September, Cao Lãnh sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

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

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit Cao Lãnh?

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

2.2

Sightseeing

11th-best month of the year

3.5

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Cao Lãnh.

What to pack for Cao Lãnh in September

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

In September, Cao Lãnh sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. About 28 days see rain.

light clothesrain gear

UV index in Cao Lãnh 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 Cao Lãnh peaks around August 22 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 11 at about 9 (very high).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	10	11	13	12	12	11	12	13	13	9	9	9
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high

	UV index (midday)	Level
Jan	10	Very high
Feb	11	Extreme
Mar	13	Extreme
Apr	12	Extreme
May	12	Extreme
Jun	11	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	13	Extreme
Oct	9	Very high
Nov	9	Very high
Dec	9	Very high

Air quality in Cao Lãnh 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 Cao Lãnh is worst in January — around 72 µg/m³ PM2.5 (unhealthy), about 2.4× the cleanest month (August, 30 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	72	59	53	53	47	38	34	30	40	56	68	70
Level	Unhealthy	Unhealthy	Poor	Poor	Poor	Poor	Moderate	Moderate	Poor	Unhealthy	Unhealthy	Unhealthy

	PM2.5 (µg/m³)	Level
Jan	72	Unhealthy
Feb	59	Unhealthy
Mar	53	Poor
Apr	53	Poor
May	47	Poor
Jun	38	Poor
Jul	34	Moderate
Aug	30	Moderate
Sep	40	Poor
Oct	56	Unhealthy
Nov	68	Unhealthy
Dec	70	Unhealthy

Location & terrain

Where is Cao Lãnh?

Cao Lãnh sits at 10.5°N, 105.6°E, 5 m above sea level, in Vietnam. The nearest listed city is Quận Đức Thịnh, 20 km away.

Topography around Cao Lãnh

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

Within 3 km, the terrain around Cao Lãnh has only modest variations in elevation — a maximum elevation change of 19 m around an average of 5 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 23 m; within 80 km, large variations in elevation — a maximum elevation change of 680 m.

The land around Cao Lãnh is covered by trees (49%) and artificial surfaces (32%) within 3 km, cropland (51%) and trees (35%) within 16 km, and cropland (69%) and trees (24%) within 80 km.

3 km

19 m

trees 49%

16 km

23 m

cropland 51%

80 km

680 m

cropland 69%

treesgrasslandcroplandartificial surfaceswater

← August Cao Lãnh year-round climate October →Best places to visit in September

September weather nearby: Quận Đức Thịnh 20 km · Lai Vung 23 km · Long Xuyên 23 km · Sa Dec 23 km · Thốt Nốt 24 km · Tràm Chim 24 km · Kiến An 31 km · Vĩnh Thạnh 37 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

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 Cao Lãnh (10.4602°, 105.6329°, elevation 5 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. 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).

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93

	Rain chance (%)
1	92
2	92
3	92
4	92
5	93
6	93
7	93
8	94
9	94
10	94
11	95
12	95
13	95
14	96
15	96
16	96
17	96
18	96
19	96
20	95
21	95
22	95
23	95
24	94
25	94
26	94
27	94
28	94
29	94
30	94

	Oppressive (%)	Miserable (%)
1	12	88
2	12	88
3	12	88
4	13	87
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	14	86
14	14	86
15	14	86
16	14	86
17	14	86
18	14	86
19	13	87
20	13	87
21	13	87
22	13	87
23	13	87
24	13	87
25	13	87
26	13	87
27	13	87
28	12	88
29	12	88
30	13	87

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93

	Rain chance (%)
1	92
2	92
3	92
4	92
5	93
6	93
7	93
8	94
9	94
10	94
11	95
12	95
13	95
14	96
15	96
16	96
17	96
18	96
19	96
20	95
21	95
22	95
23	95
24	94
25	94
26	94
27	94
28	94
29	94
30	94

	Oppressive (%)	Miserable (%)
1	12	88
2	12	88
3	12	88
4	13	87
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	14	86
14	14	86
15	14	86
16	14	86
17	14	86
18	14	86
19	13	87
20	13	87
21	13	87
22	13	87
23	13	87
24	13	87
25	13	87
26	13	87
27	13	87
28	12	88
29	12	88
30	13	87

	Avg high (°C)	Avg low (°C)
1	32	25
2	32	25
3	32	25
4	32	25
5	32	25
6	32	25
7	32	25
8	32	25
9	32	25
10	32	25
11	32	25
12	32	25
13	32	25
14	32	25
15	32	25
16	32	25
17	32	25
18	32	25
19	32	25
20	32	25
21	32	25
22	32	25
23	32	25
24	32	25
25	32	25
26	32	25
27	32	25
28	32	25
29	32	25
30	32	25

	Clearer (%)	Cloudier (%)
1	5	95
2	5	95
3	5	95
4	5	95
5	5	95
6	5	95
7	5	95
8	5	95
9	5	95
10	5	95
11	5	95
12	5	95
13	5	95
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	6	94
21	6	94
22	6	94
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	7	93

	Rain chance (%)
1	92
2	92
3	92
4	92
5	93
6	93
7	93
8	94
9	94
10	94
11	95
12	95
13	95
14	96
15	96
16	96
17	96
18	96
19	96
20	95
21	95
22	95
23	95
24	94
25	94
26	94
27	94
28	94
29	94
30	94

	Oppressive (%)	Miserable (%)
1	12	88
2	12	88
3	12	88
4	13	87
5	13	87
6	13	87
7	14	86
8	14	86
9	14	86
10	14	86
11	14	86
12	14	86
13	14	86
14	14	86
15	14	86
16	14	86
17	14	86
18	14	86
19	13	87
20	13	87
21	13	87
22	13	87
23	13	87
24	13	87
25	13	87
26	13	87
27	13	87
28	12	88
29	12	88
30	13	87