Hồng Ngự weather in September

In September, Hồng Ngự sees average daytime highs of 32°C and overnight lows near 25°C, with 254 mm of rain across 27.9 wet days and about 12.1 hours of daylight. It is the 7th-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 Hồng Ngự's 12th-clearest and 4th-windiest month. For the whole year in context, see Hồng Ngự's year-round climate.

Daytime high: 32°; 7th warmest
Overnight low: 25°; 7th coldest
Rainfall: 254 mm; 27.9 wet days
Daylight: 12 h 06 min; 5:51 AM – 5:55 PM
Cloud cover: 90%; 12th clearest
Wind: 9 km/h; 4th windiest
Solar energy: 4.55 kWh/m²
Travel score: 2.2; out of 10

← August Hồng Ngự 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 Hồng Ngự reaches about 32°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 30°C and 34°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)	26	26	26	26	26	26	26	26	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	26
2	32	26
3	32	26
4	32	26
5	32	26
6	32	26
7	32	26
8	32	26
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 Hồng Ngự

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.

Hồng Ngự weather by month

How September compares with the rest of the year at a glance. September is the 7th-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°	23	4	11.4	4.9
Feb	32° / 23°	13	1.6	11.6	4.6
Mar	34° / 25°	35	6.6	11.9	3.1
Apr	35° / 26°	87	13.5	12.2	2.3
May	34° / 27°	170	23.6	12.5	2.1
Jun	32° / 26°	198	26.5	12.6	2.2
Jul	32° / 26°	208	27.2	12.6	2.4
Aug	32° / 26°	215	27.8	12.4	2.3
Sep	32° / 25°	254	27.9	12.1	2.2
Oct	32° / 25°	276	26.3	11.8	2.5
Nov	32° / 25°	113	14.8	11.5	3.6
Dec	31° / 24°	48	7.4	11.4	4.6

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 4% of September, with mostly cloudy or overcast conditions the remaining 95%.

	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 (%)	4	4	4	4	4	4	4	4	4	4	4	4	4	5	5	5	5	5	6	7	7	7	7	7	6	6	6	6	7	7
Cloudier (%)	96	96	96	96	96	96	96	96	96	96	96	96	96	95	95	95	95	95	94	93	93	93	93	93	94	94	94	94	93	93

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

Chance of precipitation in September

Any precipitation

Hồng Ngự gets around 254 mm of rain over 27.9 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 93% and peaks near 95% 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	92	92	92	92	92	92	93	93	93	93	93	93	94	94	94	94	94	94	94	94	94	94	94	94	94	95

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

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 91% 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 (%)	10	10	11	11	11	11	11	11	11	10	10	10	10	9	9	9	8	8	8	7	7	7	7	7	7	7	7	7	7	8
Miserable (%)	90	90	89	89	89	89	89	89	89	90	90	90	90	91	91	91	92	92	92	93	93	93	93	93	93	93	93	93	93	92

	Oppressive (%)	Miserable (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	10	90
11	10	90
12	10	90
13	10	90
14	9	91
15	9	91
16	9	91
17	8	92
18	8	92
19	8	92
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	8	92

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 10 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)	10	10	10	10	10	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	9	8	8	8	8	8	8	8	7	7
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	10	calm
2	10	calm
3	10	calm
4	10	calm
5	10	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	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	8	calm
23	8	calm
24	8	calm
25	8	calm
26	8	calm
27	8	calm
28	8	calm
29	7	calm
30	7	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 5:52 AM to 5:50 AM, and sunset from 6:05 PM to 5:45 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	12.2	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)	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:52	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:51	5:50	5:50
Sunset (PM)	6:05	6:04	6:03	6:03	6:02	6:01	6:01	6:00	5:59	5:59	5:58	5:57	5:57	5:56	5:55	5:55	5:54	5:53	5:53	5:52	5:51	5:51	5:50	5:49	5:49	5:48	5:47	5:47	5:46	5:45

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.2	5:52	6:05
2	12.2	5:52	6:04
3	12.2	5:52	6:03
4	12.2	5:52	6:03
5	12.2	5:52	6:02
6	12.2	5:52	6:01
7	12.2	5:52	6:01
8	12.1	5:52	6:00
9	12.1	5:52	5:59
10	12.1	5:52	5:59
11	12.1	5:51	5:58
12	12.1	5:51	5:57
13	12.1	5:51	5:57
14	12.1	5:51	5:56
15	12.1	5:51	5:55
16	12.1	5:51	5:55
17	12.0	5:51	5:54
18	12.0	5:51	5:53
19	12.0	5:51	5:53
20	12.0	5:51	5:52
21	12.0	5:51	5:51
22	12.0	5:51	5:51
23	12.0	5:51	5:50
24	12.0	5:51	5:49
25	12.0	5:51	5:49
26	12.0	5:51	5:48
27	11.9	5:51	5:47
28	11.9	5:51	5:47
29	11.9	5:50	5:46
30	11.9	5:50	5:45

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.55 kWh/m².

For context, solar energy here swings from a low near 4.41 kWh/m² to a high of 6.07 kWh/m² in April across the year — September's 4.55 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)	4.8	4.8	4.8	4.8	4.8	4.7	4.7	4.7	4.6	4.6	4.6	4.5	4.5	4.5	4.5	4.5	4.5	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4	4.4
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	4.8	Bright
2	4.8	Bright
3	4.8	Bright
4	4.8	Bright
5	4.8	Bright
6	4.7	Bright
7	4.7	Bright
8	4.7	Bright
9	4.6	Bright
10	4.6	Bright
11	4.6	Bright
12	4.5	Bright
13	4.5	Bright
14	4.5	Bright
15	4.5	Bright
16	4.5	Bright
17	4.5	Bright
18	4.4	Bright
19	4.4	Bright
20	4.4	Bright
21	4.4	Bright
22	4.4	Bright
23	4.4	Bright
24	4.4	Bright
25	4.4	Bright
26	4.4	Bright
27	4.4	Bright
28	4.4	Bright
29	4.4	Bright
30	4.4	Bright

Planning a trip in September

Hazard calendar for Hồng Ngự

In seasonPeak

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

Hồng Ngự sits in the Pacific typhoon belt; the season peaks July–October.

Hồng Ngự'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 Hồng Ngự?

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

2.2

Sightseeing

10th-best month of the year

3.5

Beach & pool

12th-best month of the year

September is a weaker month for outdoor sightseeing in Hồng Ngự.

What to pack for Hồng Ngự in September

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

In September, Hồng Ngự sees daytime highs around 32°C and nights near 25°C. Pack light clothes and rain gear. Worth having: sun protection. About 28 days see rain.

light clothesrain gearsun protection

UV index in Hồng Ngự 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 Hồng Ngự peaks around August 18 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near November 20 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	12	12	11	12	12	13	13	9	9	9
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high

	UV index (midday)	Level
Jan	10	Extreme
Feb	11	Extreme
Mar	12	Extreme
Apr	12	Extreme
May	11	Extreme
Jun	12	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 Hồng Ngự 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 Hồng Ngự is worst in January — around 55 µg/m³ PM2.5 (poor), about 2.6× the cleanest month (August, 21 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)	55	49	44	40	33	25	24	21	27	39	47	48
Level	Poor	Poor	Poor	Poor	Moderate	Moderate	Moderate	Moderate	Moderate	Poor	Poor	Poor

	PM2.5 (µg/m³)	Level
Jan	55	Poor
Feb	49	Poor
Mar	44	Poor
Apr	40	Poor
May	33	Moderate
Jun	25	Moderate
Jul	24	Moderate
Aug	21	Moderate
Sep	27	Moderate
Oct	39	Poor
Nov	47	Poor
Dec	48	Poor

Location & terrain

Where is Hồng Ngự?

Hồng Ngự sits at 10.8°N, 105.3°E, 13 m above sea level, in Vietnam. The nearest listed city is Ấp Long Thạnh, 9.0 km away.

Topography around Hồng Ngự

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

Within 3 km, the terrain around Hồng Ngự has only modest variations in elevation — a maximum elevation change of 17 m around an average of 4 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 30 m; within 80 km, large variations in elevation — a maximum elevation change of 680 m.

The land around Hồng Ngự is covered by cropland (46%) and water (20%) within 3 km, cropland (77%) within 16 km, and cropland (80%) within 80 km.

3 km

17 m

cropland 46%

16 km

30 m

cropland 77%

80 km

680 m

cropland 80%

treesgrasslandcroplandartificial surfaceswaterwetland

← August Hồng Ngự year-round climate October →Best places to visit in September

September weather nearby: Ấp Long Thạnh 9.0 km · Tân Châu 12 km · Châu Phong 25 km · Kiến An 26 km · Tràm Chim 28 km · Châu Đốc 28 km · Long Xuyên 47 km · Cao Lãnh 49 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 Hồng Ngự (10.8°, 105.35°, 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). 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	26
2	32	26
3	32	26
4	32	26
5	32	26
6	32	26
7	32	26
8	32	26
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	4	96
2	4	96
3	4	96
4	4	96
5	4	96
6	4	96
7	4	96
8	4	96
9	4	96
10	4	96
11	4	96
12	4	96
13	4	96
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

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

	Oppressive (%)	Miserable (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	10	90
11	10	90
12	10	90
13	10	90
14	9	91
15	9	91
16	9	91
17	8	92
18	8	92
19	8	92
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	8	92

	Avg high (°C)	Avg low (°C)
1	32	26
2	32	26
3	32	26
4	32	26
5	32	26
6	32	26
7	32	26
8	32	26
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	4	96
2	4	96
3	4	96
4	4	96
5	4	96
6	4	96
7	4	96
8	4	96
9	4	96
10	4	96
11	4	96
12	4	96
13	4	96
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

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

	Oppressive (%)	Miserable (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	10	90
11	10	90
12	10	90
13	10	90
14	9	91
15	9	91
16	9	91
17	8	92
18	8	92
19	8	92
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	8	92

	Avg high (°C)	Avg low (°C)
1	32	26
2	32	26
3	32	26
4	32	26
5	32	26
6	32	26
7	32	26
8	32	26
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	4	96
2	4	96
3	4	96
4	4	96
5	4	96
6	4	96
7	4	96
8	4	96
9	4	96
10	4	96
11	4	96
12	4	96
13	4	96
14	5	95
15	5	95
16	5	95
17	5	95
18	5	95
19	6	94
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	6	94
26	6	94
27	6	94
28	6	94
29	7	93
30	7	93

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

	Oppressive (%)	Miserable (%)
1	10	90
2	10	90
3	11	89
4	11	89
5	11	89
6	11	89
7	11	89
8	11	89
9	11	89
10	10	90
11	10	90
12	10	90
13	10	90
14	9	91
15	9	91
16	9	91
17	8	92
18	8	92
19	8	92
20	7	93
21	7	93
22	7	93
23	7	93
24	7	93
25	7	93
26	7	93
27	7	93
28	7	93
29	7	93
30	8	92