Ba Đồn weather in September

In September, Ba Đồn sees average daytime highs of 29°C and overnight lows near 26°C, with 366 mm of rain across 19.6 wet days and about 12.1 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 30°C in the first days to 28°C by the end. The sky is clear or mostly clear about 17% of the time in September, and the air most often feels miserable.

Daylight stretches from about 12 h 24 min at the start of September to 11 h 54 min by month's end. Set against the rest of the year, September is Ba Đồn's 8th-clearest and 10th-windiest month. For the whole year in context, see Ba Đồn's year-round climate.

Daytime high
29°
5th warmest
Overnight low
26°
9th coldest
Rainfall
366 mm
19.6 wet days
Daylight
12 h 06 min
5:46 AM – 5:52 PM
Cloud cover
75%
8th clearest
Wind
13 km/h
10th windiest
Solar energy
4.48 kWh/m²
Travel score
4.1
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 30°C in the first days to 28°C by the end.

A typical September day in Ba Đồn 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 31°C. Set against its neighbours, September runs about 2°C cooler than August and about 2°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13027
23027
33027
43027
53027
63026
73026
83026
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192926
202926
212926
222826
232826
242826
252826
262825
272825
282825
292825
302825

How September really feels in Ba Đồn

Once humidity and wind are folded in, September averages 25 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
25
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.

Ba Đồn weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan21° / 18°12817.111.15.2
Feb22° / 19°7312.811.45.9
Mar24° / 21°6911.711.96.6
Apr27° / 24°7811.212.46.3
May29° / 26°10313.512.84.9
Jun31° / 27°617.6134.4
Jul31° / 27°1069.2134.4
Aug30° / 27°16713.512.64.1
Sep29° / 26°36619.612.14.1
Oct27° / 24°48823.311.64.6
Nov25° / 22°31720.111.25.1
Dec22° / 20°21319.5115.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 70%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12377
22278
32278
42278
52278
62278
72476
82476
92476
102476
112575
122674
132773
142773
152971
163070
173169
183268
193367
203367
213466
223565
233763
243763
253862
263961
273961
283961
294060
304159

Chance of precipitation in September

Any precipitation

Ba Đồn gets around 366 mm of rain over 19.6 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 65% and peaks near 73% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
154
255
356
456
557
658
759
860
961
1063
1164
1265
1366
1466
1567
1668
1768
1868
1969
2069
2170
2270
2370
2471
2571
2672
2772
2873
2973
3073

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 50% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
104060
204159
304159
404258
514257
614356
714356
814356
914356
1014356
1124355
1224454
1324454
1424553
1524553
1634651
1734750
1834850
1934849
2034948
2135146
2235245
2345244
2445442
2545541
2645739
2755738
2855936
2966034
3066133

Wind in September

Winds average 13 km/h in September.

Across September, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202530
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
914light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2814light breeze
2914light breeze
3014light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 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 30 minutes over September. Sunrise moves from 5:43 AM to 5:48 AM, and sunset from 6:05 PM to 5:39 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:436:05
212.35:446:04
312.35:446:03
412.35:446:02
512.35:446:01
612.35:446:00
712.35:446:00
812.25:455:59
912.25:455:58
1012.25:455:57
1112.25:455:56
1212.25:455:55
1312.25:455:54
1412.15:455:53
1512.15:465:52
1612.15:465:52
1712.15:465:51
1812.15:465:50
1912.05:465:49
2012.05:465:48
2112.05:465:47
2212.05:475:46
2312.05:475:45
2412.05:475:45
2511.95:475:44
2611.95:475:43
2711.95:475:42
2811.95:485:41
2911.95:485:40
3011.95:485:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.48 kWh/m².

For context, solar energy here swings from a low near 2.33 kWh/m² to a high of 5.83 kWh/m² in May across the year — September's 4.48 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.7Bright
94.6Bright
104.6Bright
114.6Bright
124.5Bright
134.5Bright
144.5Bright
154.5Bright
164.4Bright
174.4Bright
184.4Bright
194.4Bright
204.3Bright
214.3Bright
224.3Bright
234.3Bright
244.3Bright
254.2Bright
264.2Bright
274.2Bright
284.1Bright
294.1Bright
304.1Bright
Planning a trip in September

Hazard calendar for Ba Đồn

In seasonPeak

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

Ba Đồn sits in the Pacific typhoon belt; the season peaks July–October.

Ba Đồn's monsoon runs September–November, 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 Ba Đồn?

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

4.1
Sightseeing
11th-best month of the year
5.2
Beach & pool
7th-best month of the year

September is a reasonable time to visit Ba Đồn for sightseeing.

What to pack for Ba Đồn in September

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

In September, Ba Đồn sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. About 20 days see rain.

light clothesrain gear

Sea temperature near Ba Đồn 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 25 km away) is warmest in August at about 30°C and coldest in February near 22°C.

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

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDecrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar23Refreshing
Apr25Warm
May28Warm
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov26Warm
Dec24Refreshing

UV index in Ba Đồn in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ba Đồn peaks around August 12 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 7 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highVery highExtremeVery highAug 12UV 13Dec 16UV 7
UV index (midday)Level
Jan8Very high
Feb10Extreme
Mar10Very high
Apr9Very high
May12Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Extreme
Nov8Very high
Dec7High

Air quality in Ba Đồn 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 Ba Đồn is worst in April — around 38 µg/m³ PM2.5 (poor), about 2.8× the cleanest month (July, 14 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateApr 1237 µg/m³Jul 1814 µg/m³
PM2.5 (µg/m³)Level
Jan24Moderate
Feb26Moderate
Mar33Moderate
Apr38Poor
May21Moderate
Jun15Moderate
Jul14Moderate
Aug14Moderate
Sep16Moderate
Oct22Moderate
Nov21Moderate
Dec25Moderate
Location & terrain

Where is Ba Đồn?

Ba Đồn sits at 17.8°N, 106.4°E, 8 m above sea level, in Vietnam. The nearest listed city is Hoàn Lão, 22 km away.

NghènHồng LĩnhCam Lộ

Topography around Ba Đồn

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

Within 3 km, the terrain around Ba Đồn has only modest variations in elevation — a maximum elevation change of 13 m around an average of 3 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 365 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,998 m.

The land around Ba Đồn is covered by cropland (28%), artificial surfaces (21%) and water (21%) within 3 km, trees (37%) and water (35%) within 16 km, and trees (58%) and water (34%) within 80 km.

3 km
13 m
16 km
365 m
80 km
1,998 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Hoàn Lão 22 km · Kỳ Anh 37 km · Đồng Hới 38 km · Quán Hàu 45 km · Hà Tĩnh 85 km · Nghèn 103 km · Hồng Lĩnh 115 km · Cam Lộ 121 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 Ba Đồn (17.7535°, 106.4236°, elevation 8 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).