Thị Trấn Đầm Hà weather in September

In September, Thị Trấn Đầm Hà sees average daytime highs of 29°C and overnight lows near 26°C, with 276 mm of rain across 19.2 wet days and about 12.1 hours of daylight. It is the 4th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 30% 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 48 min by month's end. Set against the rest of the year, September is Thị Trấn Đầm Hà's 4th-clearest and 8th-windiest month. For the whole year in context, see Thị Trấn Đầm Hà's year-round climate.

Daytime high
29°
4th warmest
Overnight low
26°
9th coldest
Rainfall
276 mm
19.2 wet days
Daylight
12 h 06 min
5:40 AM – 5:48 PM
Cloud cover
64%
4th clearest
Wind
11 km/h
8th windiest
Solar energy
4.58 kWh/m²
Travel score
4.5
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in Thị Trấn Đầm Hà 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 30°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12926
22926
32926
42926
52926
62926
72926
82926
92926
102926
112926
122926
132926
142926
152926
162926
172926
182926
192925
202825
212825
222825
232825
242825
252825
262825
272825
282825
292825
302825

How September really feels in Thị Trấn Đầm Hà

Once humidity and wind are folded in, September averages 21 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
21
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.

Thị Trấn Đầm Hà weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan17° / 15°8614.210.85.0
Feb18° / 16°6613.111.35.2
Mar21° / 18°9115.611.85.3
Apr24° / 22°8013.312.56.1
May27° / 25°21318.9135.0
Jun29° / 27°32023.613.33.5
Jul29° / 27°4242513.23.4
Aug29° / 26°4162512.73.5
Sep29° / 26°27619.212.14.5
Oct27° / 24°10911.111.56.7
Nov23° / 20°689.5117.0
Dec19° / 16°629.910.76.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 14% of September, with mostly cloudy or overcast conditions the remaining 57%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23169
33169
43169
53367
63367
73367
83466
93565
103664
113763
123961
133961
144159
154357
164357
174555
184654
194753
204951
215050
225149
235248
245347
255446
265644
275644
285743
295842
305941

Chance of precipitation in September

Any precipitation

Thị Trấn Đầm Hà gets around 276 mm of rain over 19.2 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 64% and peaks near 78% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%80%151015202530
Rain chance (%)
178
278
378
477
577
676
775
874
973
1072
1170
1269
1368
1466
1565
1663
1762
1860
1959
2058
2156
2255
2354
2453
2552
2651
2750
2849
2948
3047

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 53% of days. Sticky, muggy-or-worse air turns up on roughly 97% of them.

0%25%50%75%100%151015202530
Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
10011980
20012079
30022177
40022276
50132373
60132472
70142471
80152569
90152569
100262666
110272665
120282763
130292762
1403102859
1503112957
1603123055
1703133153
1803143251
1904153447
2004163545
2104173742
2204183940
2304184037
2404194234
2505194332
2605204530
2706214627
2816214625
2917224723
3018224722

Wind in September

Winds average 11 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
711calm
811calm
911calm
1011calm
1111calm
1211calm
1311calm
1411calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 36 minutes over September. Sunrise moves from 5:36 AM to 5:44 AM, and sunset from 6:02 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.45:366:02
212.45:376:01
312.45:376:00
412.45:375:59
512.35:375:58
612.35:385:57
712.35:385:56
812.35:385:56
912.35:395:55
1012.25:395:54
1112.25:395:53
1212.25:395:52
1312.25:405:51
1412.25:405:50
1512.15:405:49
1612.15:405:48
1712.15:415:47
1812.15:415:46
1912.15:415:45
2012.05:415:44
2112.05:425:43
2212.05:425:42
2312.05:425:41
2412.05:425:40
2511.95:435:39
2611.95:435:38
2711.95:435:37
2811.95:445:36
2911.85:445:35
3011.85:445:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.58 kWh/m².

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 4.89 kWh/m² in May across the year — September's 4.58 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.5Bright
54.5Bright
64.5Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.5Bright
134.6Bright
144.6Bright
154.6Bright
164.6Bright
174.6Bright
184.7Bright
194.7Bright
204.7Bright
214.7Bright
224.7Bright
234.7Bright
244.7Bright
254.7Bright
264.7Bright
274.7Bright
284.7Bright
294.7Bright
304.7Bright
Planning a trip in September

Hazard calendar for Thị Trấn Đầm Hà

In seasonPeak

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

Thị Trấn Đầm Hà sits in the Pacific typhoon belt; the season peaks July–October.

Thị Trấn Đầm Hà's monsoon runs May–September, 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 Thị Trấn Đầm Hà?

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

4.5
Sightseeing
9th-best month of the year
5.4
Beach & pool
3rd-best month of the year

September is a reasonable time to visit Thị Trấn Đầm Hà for sightseeing.

What to pack for Thị Trấn Đầm Hà in September

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

In September, Thị Trấn Đầm Hà sees daytime highs around 29°C and nights near 26°C. Pack light clothes and rain gear. Worth having: sun protection. About 19 days see rain.

light clothesrain gearsun protection

Sea temperature near Thị Trấn Đầm Hà 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 26 km away) is warmest in August at about 30°C and coldest in February near 19°C.

It's comfortable for a long swim from Mar 15 to Jan 4 — about 9.7 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan19Cool
Feb19Cool
Mar20Refreshing
Apr23Refreshing
May27Warm
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov25Warm
Dec21Refreshing

UV index in Thị Trấn Đầm Hà in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Thị Trấn Đầm Hà peaks around July 11 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 6 (high).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecHighVery highExtremeVery highHighJul 11UV 12Dec 19UV 6
UV index (midday)Level
Jan7High
Feb8Very high
Mar9Very high
Apr8Very high
May10Extreme
Jun12Extreme
Jul12Extreme
Aug9Very high
Sep10Very high
Oct9Very high
Nov7High
Dec6High

Air quality in Thị Trấn Đầm Hà 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 Thị Trấn Đầm Hà is worst in January — around 42 µg/m³ PM2.5 (poor), about 2.6× the cleanest month (July, 16 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecPoorModeratePoorJan 2342 µg/m³Jul 1716 µg/m³
PM2.5 (µg/m³)Level
Jan42Poor
Feb42Poor
Mar41Poor
Apr40Poor
May26Moderate
Jun19Moderate
Jul16Moderate
Aug18Moderate
Sep21Moderate
Oct27Moderate
Nov29Moderate
Dec39Poor
Location & terrain

Where is Thị Trấn Đầm Hà?

Thị Trấn Đầm Hà sits at 21.4°N, 107.6°E, 19 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Tiên Yên, 20 km away.

Topography around Thị Trấn Đầm Hà

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thị Trấn Đầm Hà.

Within 3 km, the terrain around Thị Trấn Đầm Hà has only modest variations in elevation — a maximum elevation change of 58 m around an average of 17 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,238 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,582 m.

The land around Thị Trấn Đầm Hà is covered by trees (51%) and cropland (36%) within 3 km, trees (44%) and water (41%) within 16 km, and trees (55%) and water (40%) within 80 km.

3 km
58 m
16 km
1,238 m
80 km
1,582 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
September weather nearby: Thị Trấn Tiên Yên 20 km · Thị Trấn Ba Chẽ 34 km · Móng Cái 43 km · Cẩm Phả Mines 48 km · Cẩm Phả 51 km · Ha Long 70 km · Thị Trấn Na Dương 77 km · Cát Bà 90 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 Thị Trấn Đầm Hà (21.3531°, 107.5972°, elevation 19 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).