Ha Long weather in October

In October, Ha Long sees average daytime highs of 28°C and overnight lows near 23°C, with 104 mm of rain across 11.9 wet days and about 11.5 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 30°C in the first days to 27°C by the end. The sky is clear or mostly clear about 40% of the time in October, and the air most often feels oppressive.

Daylight stretches from about 11 h 48 min at the start of October to 11 h 12 min by month's end. Set against the rest of the year, October is Ha Long's 1st-clearest and 4th-windiest month. For the whole year in context, see Ha Long's year-round climate.

Daytime high
28°
6th warmest
Overnight low
23°
7th coldest
Rainfall
104 mm
11.9 wet days
Daylight
11 h 30 min
5:51 AM – 5:22 PM
Cloud cover
53%
1st clearest
Wind
11 km/h
4th windiest
Solar energy
4.38 kWh/m²
Travel score
5.7
out of 10

Ha Long is provincial city of Vietnam.

Air quality
Elevated
PM10 47 µg/m³ · 2015
Density
993/km²
people per km²

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 30°C in the first days to 27°C by the end.

A typical October day in Ha Long reaches about 28°C in the afternoon and slips back to 23°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 31°C. Set against its neighbours, October runs about 2°C cooler than September and about 3°C warmer than November.

15°20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13024
23024
33024
43024
52924
62924
72924
82923
92923
102923
112923
122923
132923
142923
152923
162823
172823
182823
192822
202822
212822
222822
232822
242822
252822
262822
272822
282721
292721
302721
312721

How October really feels in Ha Long

Once humidity and wind are folded in, October averages 7 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
7
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

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

Ha Long weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan19° / 15°346.510.96.3
Feb20° / 16°215.611.36.4
Mar22° / 18°448.811.96.5
Apr26° / 22°6911.612.56.0
May30° / 25°21919.5133.9
Jun31° / 27°26622.413.22.9
Jul31° / 27°30524.313.12.8
Aug31° / 26°38126.212.72.7
Sep30° / 25°2432012.13.6
Oct28° / 23°10411.911.55.7
Nov25° / 19°518.2117.1
Dec21° / 16°315.910.87.0

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% of the time in October, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of October, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15347
25446
35545
45644
55644
65842
75842
85842
95842
105842
115842
125842
135842
145941
155941
165941
176040
186040
196139
206139
216139
226238
236238
246238
256238
266238
276238
286238
296238
306337
316238

Chance of precipitation in October

Any precipitation

Ha Long gets around 104 mm of rain over 11.9 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 38% and peaks near 48% on the wettest days. The odds ease toward the end of the month.

0%20%40%60%151015202531
Rain chance (%)
148
247
347
446
546
645
745
845
944
1044
1143
1243
1342
1441
1540
1639
1739
1838
1937
2036
2135
2234
2332
2431
2530
2629
2728
2828
2927
3027
3127

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

Most of October feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, October lands in the oppressive band about 37% of days. Sticky, muggy-or-worse air turns up on roughly 76% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)Miserable (%)
1018184329
2019194427
30110194426
40210204424
50211214422
60212214421
70212224420
80213234418
90214244317
100214244316
110315254214
121315264213
131316274112
141316284012
151317293911
161417293810
172417303810
18251730379
19251731378
20261731368
21371731357
22481731346
23491731336
245101731325
256111730315
267121730305
278131729294
288141729284
299141728274
3010151728264
3110161827263

Wind in October

Winds average 11 km/h in October.

Across October, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1011calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in October

DaylightNight

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

Days shrink by about 36 minutes over October. Sunrise moves from 5:46 AM to 5:58 AM, and sunset from 5:35 PM to 5:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.85:465:35
211.85:475:34
311.85:475:33
411.75:475:32
511.75:485:31
611.75:485:30
711.75:485:30
811.75:495:29
911.65:495:28
1011.65:495:27
1111.65:505:26
1211.65:505:25
1311.65:505:24
1411.55:515:24
1511.55:515:23
1611.55:515:22
1711.55:525:21
1811.55:525:21
1911.55:535:20
2011.45:535:19
2111.45:535:18
2211.45:545:18
2311.45:545:17
2411.45:555:16
2511.35:555:16
2611.35:565:15
2711.35:565:14
2811.35:575:14
2911.35:575:13
3011.35:585:13
3111.25:585:12

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 4.38 kWh/m².

For context, solar energy here swings from a low near 2.58 kWh/m² to a high of 5.07 kWh/m² in May across the year — October's 4.38 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.6Bright
24.6Bright
34.6Bright
44.6Bright
54.6Bright
64.6Bright
74.5Bright
84.5Bright
94.5Bright
104.5Bright
114.5Bright
124.4Bright
134.4Bright
144.4Bright
154.4Bright
164.3Bright
174.3Bright
184.3Bright
194.3Bright
204.3Bright
214.3Bright
224.3Bright
234.2Bright
244.2Bright
254.2Bright
264.2Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
314.1Bright
Planning a trip in October

Hazard calendar for Ha Long

In seasonPeak

In October, Ha Long sits inside its pacific typhoon season. The full year is below, with each hazard's peak months called out.

Ha Long sits in the Pacific typhoon belt; the season peaks July–October.

Ha Long'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 October a good time to visit Ha Long?

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

5.7
Sightseeing
7th-best month of the year
6.7
Beach & pool
1st-best month of the year

October is a reasonable time to visit Ha Long for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Ha Long in October

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

In October, Ha Long sees daytime highs around 28°C and nights near 23°C. Pack light clothes. Worth having: rain gear. About 12 days see rain.

light clothesrain gear

Sea temperature near Ha Long in October

The nearest coast averages about 28°C in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 32 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 13 to Jan 10 — about 10 months when the water holds above 20°C.

20°25°30°JanFebMarAprMayJunJulAugSepOctNovDeccoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°C)Comfort
Jan20Cool
Feb19Cool
Mar20Refreshing
Apr23Refreshing
May27Warm
Jun29Tropical
Jul29Tropical
Aug30Tropical
Sep29Tropical
Oct28Warm
Nov25Warm
Dec22Refreshing

UV index in Ha Long in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 9 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ha Long peaks around July 12 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighJul 12UV 12Dec 19UV 6
UV index (midday)Level
Jan7High
Feb8Very high
Mar9Very high
Apr8Very high
May10Extreme
Jun12Extreme
Jul12Extreme
Aug9Very high
Sep9Very high
Oct9Very high
Nov7High
Dec6High

Air quality in Ha Long in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Ha Long 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 Ha Long?

Ha Long sits at 21.0°N, 107.1°E, 8 m above sea level, in Vietnam. The nearest listed city is Cẩm Phả, 22 km away.

Topography around Ha Long

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

Within 3 km, the terrain around Ha Long has only modest variations in elevation — a maximum elevation change of 150 m around an average of 9 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 679 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,530 m.

The land around Ha Long is covered by water (57%) and artificial surfaces (21%) within 3 km, water (46%) and trees (37%) within 16 km, and trees (42%) and water (42%) within 80 km.

3 km
150 m
16 km
679 m
80 km
1,530 m
treesgrasslandcroplandartificial surfacesbare terrainwatermangroves
October weather nearby: Cẩm Phả 22 km · Cẩm Phả Mines 25 km · Cát Bà 25 km · Thành Phố Uông Bí 33 km · Đố Sơn 40 km · Haiphong 42 km · Thị Trấn Ba Chẽ 42 km · Kiến An 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
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 Ha Long (20.9505°, 107.0734°, 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).