Kỳ Anh weather in September

In September, Kỳ Anh sees average daytime highs of 30°C and overnight lows near 25°C, with 312 mm of rain across 21.4 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 31°C in the first days to 29°C by the end. The sky is clear or mostly clear about 13% 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 Kỳ Anh's 7th-clearest and 12th-windiest month. For the whole year in context, see Kỳ Anh's year-round climate.

Daytime high
30°
5th warmest
Overnight low
25°
8th coldest
Rainfall
312 mm
21.4 wet days
Daylight
12 h 06 min
5:46 AM – 5:52 PM
Cloud cover
78%
7th clearest
Wind
9 km/h
12th windiest
Solar energy
4.37 kWh/m²
Travel score
3.4
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 31°C in the first days to 29°C by the end.

A typical September day in Kỳ Anh reaches about 30°C in the afternoon and slips back to 25°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 27°C and 33°C. Set against its neighbours, September runs about 2°C cooler than August and about 3°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
13126
23126
33126
43126
53126
63126
73126
83126
93126
103126
113126
123026
133026
143026
153025
163025
173025
183025
193025
203025
213025
223025
233025
243025
252925
262925
272925
282925
292925
302925

How September really feels in Kỳ Anh

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.

Kỳ Anh 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° / 17°6712.3115.8
Feb22° / 18°459.711.46.4
Mar25° / 20°5610.111.96.6
Apr29° / 24°7710.612.45.2
May32° / 26°1261512.83.5
Jun33° / 27°8010.313.13.0
Jul33° / 27°13212.9133.1
Aug32° / 27°18916.912.63.2
Sep30° / 25°31221.412.13.4
Oct28° / 23°42722.911.64.3
Nov25° / 21°2461811.25.3
Dec22° / 18°12815.610.95.5

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 13% 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 74%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
12080
22080
32080
41981
51981
61981
71981
81981
91981
102080
112080
122278
132278
142377
152476
162674
172773
182872
192872
202971
213070
223169
233268
243268
253367
263367
273367
283367
293466
303565

Chance of precipitation in September

Any precipitation

Kỳ Anh gets around 312 mm of rain over 21.4 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 72% and peaks near 76% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
165
266
366
466
567
668
768
869
970
1070
1171
1272
1372
1473
1573
1673
1774
1874
1974
2074
2174
2275
2375
2475
2575
2676
2776
2876
2976
3076

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 70% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202530
Muggy (%)Oppressive (%)Miserable (%)
102080
202080
302179
402179
512277
612277
712376
812376
912475
1012475
1112574
1222573
1322672
1422672
1522771
1622771
1732869
1832869
1932968
2033067
2133067
2233166
2333265
2433364
2533364
2643462
2743561
2843660
2953758
3053956

Wind in September

Winds average 9 km/h in September, the calmest month.

Across September, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 5:44 AM to 5:48 AM, and sunset from 6:05 PM to 5:40 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:446:05
212.35:446:04
312.35:446:04
412.35:446:03
512.35:446:02
612.35:456:01
712.35:456:00
812.25:455:59
912.25:455:58
1012.25:455:58
1112.25:455:57
1212.25:465:56
1312.25:465:55
1412.15:465:54
1512.15:465:53
1612.15:465:52
1712.15:465:51
1812.15:465:50
1912.05:475:49
2012.05:475:49
2112.05:475:48
2212.05:475:47
2312.05:475:46
2412.05:475:45
2511.95:485:44
2611.95:485:43
2711.95:485:42
2811.95:485:42
2911.95:485:41
3011.95:485:40

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 2.2 kWh/m² to a high of 5.79 kWh/m² in June across the year — September's 4.37 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.7Bright
44.7Bright
54.7Bright
64.6Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.2Bright
224.2Bright
234.1Bright
244.1Bright
254.1Bright
264.0Bright
274.0Bright
284.0Moderate
294.0Moderate
303.9Moderate
Planning a trip in September

Hazard calendar for Kỳ Anh

In seasonPeak

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

Kỳ Anh sits in the Pacific typhoon belt; the season peaks July–October.

Kỳ Anh'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 Kỳ Anh?

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

3.4
Sightseeing
9th-best month of the year
4.8
Beach & pool
9th-best month of the year

September is a weaker month for outdoor sightseeing in Kỳ Anh.

What to pack for Kỳ Anh in September

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

In September, Kỳ Anh sees daytime highs around 30°C and nights near 25°C. Pack light clothes and rain gear. About 21 days see rain.

light clothesrain gear

Sea temperature near Kỳ Anh 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 offshore 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°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan22Refreshing
Feb22Refreshing
Mar22Refreshing
Apr25Warm
May28Warm
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov26Warm
Dec24Refreshing

UV index in Kỳ Anh 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 Kỳ Anh peaks around August 11 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighAug 11UV 13Dec 15UV 6
UV index (midday)Level
Jan8Very high
Feb10Very high
Mar10Very high
Apr9Very high
May11Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep11Extreme
Oct10Very high
Nov8Very high
Dec6High

Air quality in Kỳ Anh 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 Kỳ Anh 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 Kỳ Anh?

Kỳ Anh sits at 18.1°N, 106.3°E, 21 m above sea level, in Vietnam. The nearest listed city is Ba Đồn, 37 km away.

Topography around Kỳ Anh

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

Within 3 km, the terrain around Kỳ Anh has only modest variations in elevation — a maximum elevation change of 109 m around an average of 12 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,030 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,983 m.

The land around Kỳ Anh is covered by trees (34%), cropland (28%) and artificial surfaces (22%) within 3 km, trees (56%) within 16 km, and trees (52%) and water (38%) within 80 km.

3 km
109 m
16 km
1,030 m
80 km
1,983 m
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Ba Đồn 37 km · Hà Tĩnh 52 km · Hoàn Lão 59 km · Nghèn 70 km · Đồng Hới 74 km · Hồng Lĩnh 81 km · Quán Hàu 82 km · Nghi Xuân 88 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 Kỳ Anh (18.0624°, 106.2983°, elevation 21 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).