Ha Long weather in July

In July, Ha Long sees average daytime highs of 31°C and overnight lows near 27°C, with 305 mm of rain across 24.3 wet days and about 13.1 hours of daylight. It is the 2nd-warmest and 2nd-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 10% of the time in July, and the air most often feels miserable.

Daylight stretches from about 13 h 18 min at the start of July to 13 hours by month's end. Set against the rest of the year, July is Ha Long's 11th-clearest and 1st-windiest month. For the whole year in context, see Ha Long's year-round climate.

Daytime high
31°
2nd warmest
Overnight low
27°
12th coldest
Rainfall
305 mm
24.3 wet days
Daylight
13 h 12 min
5:23 AM – 6:32 PM
Cloud cover
84%
11th clearest
Wind
11 km/h
1st windiest
Solar energy
4.96 kWh/m²
Travel score
2.8
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 July

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 31°C through the month.

A typical July day in Ha Long reaches about 31°C in the afternoon and slips back to 27°C overnight — a 5°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 34°C. Set against its neighbours, July runs on par with June and on par with August.

20°25°30°35°151015202531
Avg high (°C)Avg low (°C)
13127
23127
33127
43127
53127
63127
73127
83127
93127
103127
113127
123127
133127
143127
153127
163127
173127
183127
193127
203127
213127
223127
233127
243126
253126
263126
273126
283126
293126
303126
313126

How July really feels in Ha Long

Once humidity and wind are folded in, July averages 31 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
31
31 feel dangerously hot (≥ 39°C)
Days feeling ≤ C
0
wind chill below the day's low

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

Ha Long weather by month

How July compares with the rest of the year at a glance. July is the 2nd-warmest and 2nd-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 July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 10% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 7% of July, with mostly cloudy or overcast conditions the remaining 84%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
11486
21585
31585
41684
51684
61684
71684
81783
91783
101783
111882
121783
131783
141783
151684
161684
171684
181684
191684
201783
211684
221684
231684
241684
251684
261783
271783
281783
291783
301882
311981

Chance of precipitation in July

Any precipitation

Ha Long gets around 305 mm of rain over 24.3 wet days in July. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 79% and peaks near 84% on the wettest days. The odds climb toward the end of the month.

0%20%40%60%80%151015202531
Rain chance (%)
177
277
377
477
577
677
777
877
977
1077
1177
1277
1378
1478
1578
1678
1779
1879
1979
2079
2180
2280
2381
2481
2582
2682
2783
2883
2983
3084
3184

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the miserable band about 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

0%25%50%75%100%151015202531
Oppressive (%)Miserable (%)
1298
2298
3298
4298
5298
6397
7397
8397
9397
10397
11298
12298
13298
14298
15298
16298
17199
18199
19199
20199
21199
22199
23199
24199
25199
26199
27199
28199
29298
30298
31298

Wind in July

Winds average 11 km/h in July, the windiest month of the year.

Across July, daily wind ranges from about 10 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112calm
212calm
312calm
412calm
512calm
612calm
712calm
812calm
912calm
1012calm
1111calm
1211calm
1311calm
1411calm
1511calm
1611calm
1711calm
1811calm
1911calm
2011calm
2111calm
2211calm
2311calm
2411calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm
3110calm

Sunrise & sunset in July

DaylightNight

Daylight runs from about 13 h 18 min at the start of July to 13 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 18 minutes over July. Sunrise moves from 5:17 AM to 5:28 AM, and sunset from 6:33 PM to 6:27 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.35:176:33
213.35:186:33
313.35:186:33
413.25:186:33
513.25:196:33
613.25:196:33
713.25:196:33
813.25:206:33
913.25:206:33
1013.25:206:33
1113.25:216:33
1213.25:216:33
1313.25:216:33
1413.25:226:32
1513.25:226:32
1613.25:236:32
1713.15:236:32
1813.15:236:32
1913.15:246:31
2013.15:246:31
2113.15:246:31
2213.15:256:31
2313.15:256:30
2413.15:266:30
2513.15:266:30
2613.05:266:29
2713.05:276:29
2813.05:276:29
2913.05:286:28
3013.05:286:28
3113.05:286:27

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 4.96 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 — July's 4.96 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.1Bright
45.1Bright
55.1Bright
65.1Bright
75.1Bright
85.1Bright
95.1Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
145.0Bright
155.0Bright
165.0Bright
175.0Bright
184.9Bright
194.9Bright
204.9Bright
214.9Bright
224.8Bright
234.8Bright
244.8Bright
254.8Bright
264.8Bright
274.8Bright
284.8Bright
294.7Bright
304.7Bright
314.7Bright
Planning a trip in July

Hazard calendar for Ha Long

In seasonPeak

In July, Ha Long sits inside its pacific typhoon and monsoon 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 July a good time to visit Ha Long?

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

2.8
Sightseeing
11th-best month of the year
4.2
Beach & pool
9th-best month of the year

July is a weaker month for outdoor sightseeing in Ha Long.

What to pack for Ha Long in July

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

In July, Ha Long sees daytime highs around 31°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 24 days see rain.

light clothesrain gearsun protection

Sea temperature near Ha Long in July

The nearest coast averages about 29°C in July — 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 July

LowModerateHighVery highExtreme

Clear-sky midday UV in July peaks around 12 (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 July

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where July 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
July 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).