AI-generatedHa Long Bay at a glance
- Best time
- Nov – Apr
- Warmest month
- Jun · 31°
- Warmest sea
- Aug · 29.8°
- Sunshine a year
- 1,560 h
- Rain a year
- 1,789 mm
- Climate
- Subtropical
- Time zone
- UTC+7
- Elevation
- 8 m
Climate in Ha Long Bay
Ha Long Bay has a subtropical climate with warm summers and mild winters. June is the warmest month with average highs of 31 °C, while January is the coolest at 20 °C. With around 1,560 hours of sunshine a year, Ha Long Bay is rather dull; October is the sunniest month with 5.4 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Good
Best time to visit: November – April
October is the peak of the typhoon season
Keep in mindFrequent rainStorm season
A typical day in October
- Morning, 08:00: about 25°
- Midday, 13:00: about 28°
- Afternoon, 16:00: about 27°
- Evening, 20:00: about 25°
- Night, 23:00: about 24°
05:4617:28
Warm enough for a T-shirt in the evening.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 05:33–06:16 · evening 16:59–17:42
- Blue hour
- Morning 05:24–05:33 · evening 17:42–17:51
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Ha Long Bay in October?
In October, Ha Long Bay is hot: daytime highs average 28 °C, and even at night it stays warm at around 23 °C. The sea averages 27.9 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 116 mm in total. On about 6 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is a good month for a holiday in Ha Long Bay.
More details for October
- Daylight
- 11 h 42 min05:46 – 17:28
- UV index
- 9 · very highclear sky, noon (estimate)All months
- Muggy days
- 25 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 54 %on averageAll months
- Hot days
- 6 days30 °C or moreAll months
- Time zone
- UTC+7Asia/Bangkok
How the score comes together
- Temperatureweight 50 %83 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 30 %39 %
Each factor is rated from 0 to 100 % and weighted for the travel style “Nature escape”.
What to pack in October
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Insect repellent
- Rain jacket or umbrella
Sea temperature in Ha Long Bay
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 27.0 – 28.7 °C
Swimming season: Mar – Dec
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Ha Long Bay ranges from 18.9 °C in February to 29.8 °C in August. It is warm enough for a comfortable swim (20 °C and more) from March to December.
The sea warms up slowly: it is warmest in August, while the air already peaks in June. In December the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 29.3 and 30.5 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 19.4° | 18.3° | 20.5° | fresh |
| FebruaryFeb | 18.9° | 17.3° | 20.1° | fresh |
| MarchMar | 20.1° | 18.6° | 21.6° | refreshing |
| AprilApr | 22.9° | 21.8° | 23.6° | refreshing |
| MayMay | 26.9° | 25.9° | 27.9° | warm |
| JuneJun | 29.2° | 28.5° | 30.1° | very warm |
| JulyJul | 29.7° | 28.8° | 30.7° | very warm |
| AugustAug | 29.8° | 29.3° | 30.5° | very warm |
| SeptemberSep | 29.4° | 28.6° | 30.0° | very warm |
| OctoberOct | 27.9° | 27.0° | 28.7° | warm |
| NovemberNov | 25.3° | 24.5° | 26.3° | pleasant |
| DecemberDec | 22.0° | 20.9° | 23.0° | refreshing |
Sunshine hours in Ha Long Bay
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.4 of 11.7 hours of daylight in Ha Long Bay, 46 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Ha Long Bay
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 9 · very highStay in the shade around midday; SPF 50, clothing, hat and sunglasses.
The sun is strongest in July (UV 12).
Minutes until sunburn in October
- Very fair skin
- about 15 min
- Fair skin
- about 20 min
- Light brown skin
- about 25 min
- Olive skin
- about 35 min
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Ha Long Bay: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Ha Long Bay has about 13 rainy days with 116 mm of rain in total.
Wind and clouds in Ha Long Bay
How breezy and how cloudy Ha Long Bay is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Ha Long Bay typically peaks at 15 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 54 % of the sky over Ha Long Bay: variable cloud, with about 5.4 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Ha Long Bay
How often the day gets hot in Ha Long Bay (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Ha Long Bay has about 6 hot days, with an average daytime high of 28 °C: often muggy. The air feels warmer than the thermometer says: light, airy clothes and slow days help.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Ha Long Bay
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Pleasant 15–20°
- Warm 20–24°
- Hot 24° and more
- muggy month (10+ muggy days)
WarmOctober: nights around 23°. Tropical nights: a fan or air conditioning helps. Muggy on about 25 days (dew point 18 °C or more).
The coolest nights are in January (15°), the warmest in June (27°). Tropical nights of 20 °C and more are the rule from April to November; then air conditioning or a fan helps you sleep. Nights are pleasant for sleeping (15 to 20 °C) from December to March. It is muggy (dew point 18 °C or more) on about 248 days a year, mostly from March to November.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 74 | 20° | 15° | 19.4° | 2.7 h | 7 | 32 |
| FebruaryFeb | 77 | 21° | 16° | 18.9° | 2.6 h | 6 | 22 |
| MarchMar | 70 | 24° | 19° | 20.1° | 3.0 h | 9 | 42 |
| AprilApr | 65 | 27° | 22° | 22.9° | 4.4 h | 12 | 73 |
| MayMay | 38 | 30° | 25° | 26.9° | 5.3 h | 20 | 220 |
| JuneJun | 25 | 31° | 27° | 29.2° | 4.9 h | 22 | 260 |
| JulyJul | 26 | 31° | 27° | 29.7° | 5.1 h | 25 | 301 |
| AugustAug | 29 | 31° | 26° | 29.8° | 4.5 h | 27 | 380 |
| SeptemberSep | 36 | 30° | 25° | 29.4° | 4.9 h | 21 | 265 |
| OctoberOct | 61 | 28° | 23° | 27.9° | 5.4 h | 13 | 116 |
| NovemberNov | 76 | 25° | 20° | 25.3° | 4.8 h | 9 | 51 |
| DecemberDec | 79 | 21° | 16° | 22.0° | 3.7 h | 6 | 28 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
20.95° N, 107.07° E · 8 m · Asia/Bangkok
Best time to visit Ha Long Bay
The best time to visit Ha Long Bay is from November to April. For a beach holiday with the sea above 21 °C, go in April and in November. For sightseeing, day trips and hiking, conditions are most comfortable from November to April. Rain is most frequent from April to October; the wettest month is August with 380 mm.
Ha Long Bay through the seasons
How the weather changes over the seasons, with averages for each.
Ha Long Bay in spring
Mar – May
Fair
- 24–30 °C by day
- Sea 23 °C
- 4 h of sun a day
- 41 rainy days in all
Ha Long Bay in summer
Jun – Aug
Poor
- 31 °C by day
- Sea 30 °C
- 5 h of sun a day
- 73 rainy days in all
Ha Long Bay in autumn
Sep – Nov
Fair
- 25–30 °C by day
- Sea 28 °C
- 5 h of sun a day
- 42 rainy days in all
Ha Long Bay in winter
Dec – Feb
Good
- 20–21 °C by day
- Sea 20 °C
- 3 h of sun a day
- 18 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Ha Long Bay for you.
Your best months: February – March, December
Based on the climate averages; tap a month to see its details.
Compare two months in Ha Long Bay
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
December has the better holiday weather in Ha Long Bay: score 79 against 61. In December, days are 7 °C cooler than in October. The sea is 6 °C cooler in December. December has 7 fewer rainy days. The sun shines 2 hours less a day in December.
| Month | October | December |
|---|---|---|
| Weather score | 61 | 79better |
| Day high | 28° | 21° |
| Night low | 23° | 16° |
| Sea | 27.9° | 22.0° |
| Sunshine | 5.4 hbetter | 3.7 h |
| Rainy days | 13 | 6better |
| Rainfall | 116 mm | 28 mmbetter |
| Muggy days | 25 | 5better |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
Apr, Nov
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
Nov – Apr
15–28 °C and not too much rain
Rainy months
Apr – Oct
12 or more rainy days
Ha Long Bay month by month
The typical weather for every month at a glance.
74January20° · Sea 19° · 3 h
In January, Ha Long Bay is mild: daytime highs average 20 °C, and nights cool down to about 15 °C. The sea averages 19.4 °C – bracing, so a wetsuit helps for longer swims. The sun is scarce, with only about 3 hours a day. Rain falls on about 7 days, adding up to 32 mm. All in all, January is a good month for a holiday in Ha Long Bay.
Ha Long Bay in January77February21° · Sea 19° · 3 h
In February, Ha Long Bay is mild: daytime highs average 21 °C, and nights cool down to about 16 °C. The sea averages 18.9 °C – bracing, so a wetsuit helps for longer swims. The sun is scarce, with only about 3 hours a day. Rain falls on about 6 days, adding up to 22 mm. All in all, February is a good month for a holiday in Ha Long Bay.
Ha Long Bay in February70March24° · Sea 20° · 3 h
In March, Ha Long Bay is warm: daytime highs average 24 °C, and nights cool down to about 19 °C. The sea averages 20.1 °C – refreshing for a swim. The sun is scarce, with only about 3 hours a day. Rain falls on about 9 days, adding up to 42 mm. The air is often humid and muggy. All in all, March is a good month for a holiday in Ha Long Bay.
Ha Long Bay in March65April27° · Sea 23° · 4 h
In April, Ha Long Bay is hot: daytime highs average 27 °C, and even at night it stays warm at around 22 °C. The sea averages 22.9 °C – refreshing for a swim. Expect around 4 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 73 mm in total. The air is often humid and muggy. All in all, April is a good month for a holiday in Ha Long Bay.
Ha Long Bay in April38May30° · Sea 27° · 5 h
In May, Ha Long Bay is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 26.9 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. It rains often – on about 20 days, adding up to 220 mm. On about 14 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, May is not an ideal month for a holiday in Ha Long Bay.
Ha Long Bay in May25June31° · Sea 29° · 5 h
In June, Ha Long Bay is hot: daytime highs average 31 °C, and even at night it stays warm at around 27 °C. The sea averages 29.2 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It rains often – on about 22 days, adding up to 260 mm. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, June is not an ideal month for a holiday in Ha Long Bay.
Ha Long Bay in June26July31° · Sea 30° · 5 h
In July, Ha Long Bay is hot: daytime highs average 31 °C, and even at night it stays warm at around 27 °C. The sea averages 29.7 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It rains often – on about 25 days, adding up to 301 mm. On about 23 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, July is not an ideal month for a holiday in Ha Long Bay.
Ha Long Bay in July29August31° · Sea 30° · 5 h
In August, Ha Long Bay is hot: daytime highs average 31 °C, and even at night it stays warm at around 26 °C. The sea averages 29.8 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It rains often – on about 27 days, adding up to 380 mm. On about 20 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, August is not an ideal month for a holiday in Ha Long Bay.
Ha Long Bay in August36September30° · Sea 29° · 5 h
In September, Ha Long Bay is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. The sea averages 29.4 °C – almost as warm as a bath. Expect around 5 hours of sunshine a day. It rains often – on about 21 days, adding up to 265 mm. On about 15 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is not an ideal month for a holiday in Ha Long Bay.
Ha Long Bay in September61October28° · Sea 28° · 5 h
In October, Ha Long Bay is hot: daytime highs average 28 °C, and even at night it stays warm at around 23 °C. The sea averages 27.9 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. Rain is frequent, with about 13 rainy days and 116 mm in total. On about 6 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, October is a good month for a holiday in Ha Long Bay.
Ha Long Bay in October76November25° · Sea 25° · 5 h
In November, Ha Long Bay is warm: daytime highs average 25 °C, and nights cool down to about 20 °C. The sea averages 25.3 °C – pleasant for swimming. Expect around 5 hours of sunshine a day. Rain falls on about 9 days, adding up to 51 mm. All in all, November is a good month for a holiday in Ha Long Bay.
Ha Long Bay in November79December21° · Sea 22° · 4 h
In December, Ha Long Bay is warm: daytime highs average 21 °C, and nights cool down to about 16 °C. The sea averages 22.0 °C – refreshing for a swim. The sun is scarce, with only about 4 hours a day. Rain falls on about 6 days, adding up to 28 mm. All in all, December is a good month for a holiday in Ha Long Bay.
Ha Long Bay in DecemberHa Long Bay compared
Put Ha Long Bay side by side with another destination.
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Ha Long Bay vs. Hanoi
In October the holiday weather in Ha Long Bay and Hanoi is about equally good (score 61 vs. 62). During the day it is about as warm in Hanoi as in Ha Long Bay.
| in October | Ha Long Bay | Hanoi |
|---|---|---|
| Holiday score | 61 | 62 |
| Daytime high | 28° | 28° |
| Sea | 28° | – |
| Sunshine | 5 h | 5 h |
| Rainy days | 13 | 12 |
| Best time | Nov – Apr | Nov – Mar |
Through the year
Vietnam in October: the best places
In October, Ha Long Bay ranks 4 of 9 destinations in this country.
- Nha Trang29°28°67
- 2Phu Quoc (Duong Dong)28°29°66
- 3Da Nang28°28°65
- 4Ha Long BayThis page28°28°61
- 5Hanoi28°60
- 6Sa Pa21°56
- 7Huế27°51
- 8Hoi An28°28°50
Planning a trip to Ha Long Bay
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Ha Long Bay in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Ha Long Bay has its best school-holiday weather during the Christmas holidays (score 77) and its weakest during the summer holidays (score 28).
- 67
Easter holidays
Mar – Apr
Good
- 26 °C by day
- Sea 22 °C
- 4.0 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
Keep in mind: Frequent rain
- 35
May half-term
May – Jun
Poor
- 30 °C by day
- Sea 27 °C
- 5.2 h of sun a day
- 20 rainy days a month
Keep in mind: Frequent rain
- 28
Summer holidays
Jul – Aug
Poor
- 31 °C by day
- Sea 30 °C
- 4.7 h of sun a day
- 26 rainy days a month
Keep in mind: Frequent rain, Storm season
- 61
October half-term
Oct
Good
- 28 °C by day
- Sea 28 °C
- 5.4 h of sun a day
- 13 rainy days a month
Keep in mind: Frequent rain, Storm season
- 77
Christmas holidays
Dec – Jan
GoodBest holidays
- 20 °C by day
- Sea 21 °C
- 3.2 h of sun a day
- 6 rainy days a month
Good for: Sightseeing & walks
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 11 h 45 min
- Distance
- 9,340 km
- Time zone
- UTC+7
- Jet lag
- About 6 days (6 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Most routes need a change of planes, which adds time.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Storm season
Ha Long Bay lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
- January
- February
- March
- April
- May
- June: Season
- July: Season
- August: Peak
- September: Peak
- October: Peak
- November: Season
- December
Official season dates of the regional warning centres (NOAA, JMA, IMD, Météo-France, BoM); not a forecast.
Frequently asked questions about Ha Long Bay
When is the best time to visit Ha Long Bay?
The best time to visit Ha Long Bay is from November to April. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Ha Long Bay?
The sea temperature in Ha Long Bay ranges from 18.9 °C in February to 29.8 °C in August. It is warm enough for a comfortable swim (20 °C and more) from March to December.
Can you swim in Ha Long Bay in October?
Yes. In October the sea averages 27.9 °C – lovely and warm for swimming.
What is the warmest month in Ha Long Bay?
June is the warmest month, with average highs of 31 °C and nights around 27 °C. January is the coolest month at 20 °C.
When does it rain most in Ha Long Bay?
Rain is most frequent from April to October; the wettest month is August with 380 mm. The driest month is February with 22 mm.
How many hours of sunshine does Ha Long Bay get?
Ha Long Bay gets around 1,560 hours of sunshine a year. The sunniest month is October with 5.4 hours a day; in February there are 2.6 hours a day.
What time zone is Ha Long Bay in?
Ha Long Bay uses the time zone Asia/Bangkok, at UTC+7 all year.
How long is the flight from London to Ha Long Bay?
A nonstop flight from London to Ha Long Bay takes about 11 h 45 min, for a straight-line distance of about 9,340 km. Most routes need a change of planes, which adds time.
When is typhoon season in Ha Long Bay?
Ha Long Bay lies in an area that Pacific typhoons can reach. The typhoon season runs from June to November, with most storms from August to October. A direct hit on any one place is rare, but if you travel then, keep an eye on weather warnings and book flexibly.
Which school holidays are best for Ha Long Bay?
Ha Long Bay has its best school-holiday weather during the Christmas holidays (score 77) and its weakest during the summer holidays (score 28). Holiday ratings (0–100): Easter holidays 67, May half-term 35, Summer holidays 28, October half-term 61, Christmas holidays 77.
Near Ha Long Bay
Other destinations close by.
Places with a climate like Ha Long Bay
Destinations whose weather through the year is closest to Ha Long Bay's – good alternatives.