Peak in July
Coolest in January
Heavy in August
Peak in dry season
Sea Temperature
Coastal Waters(Ocean)
Annual Average
Perfect for swimming and water sports
Based on average sea surface temperature
Ocean
Halong Bay coastline
Halong Bay Monthly Weather Guide
Click any month to explore daily weather forecasts
January
February
March
April
May
June
July
August
September
October
November
December
Essential Travel Info for Halong Bay
Currency
VND
₫ Vietnamese đồng
Language
Vietnamese
Driving
Right side
Safety
High Safety
GPI: 1.786
Best Time to Visit Halong Bay
Location, climate overview & historical trends
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📍 20.9101° N, 107.1839° E
Open in Google MapsHalong Bay is a prominent destination in Vietnam.
Located at 20.91°N latitude,Halong Bay experiences a tropical climate with warm temperatures year-round.
Based on 30 years of data, July is the warmest month (avg. 31°C), while January is the coolest. August sees the most rain (73% chance), making December the driest month.
Historical Climate Trend
30-Year Analysis+0.47°C
Total over 30 years
+0.16°C
Per decade
Linear regression analysis of historical maximum temperatures for Halong Bay, based on 1995-2024 satellite data from NASA POWER.
Best Time to Visit
NASA POWER Data (1991-2021)January, February, March
Best months to visit
26°C
Avg High
Based on 30 years of NASA satellite data,Halong Bay receives approximately 1,266mm of rainfall annually. These months offer optimal temperatures and minimal rain probability for your visit.
Climate Trends
EXCLUSIVE1995-2040 Temperature Trend
1995 Avg
26.1°
2024 Avg
26.5°
2040 Proj
27°
+0.16°C
per decade (observed)
+0.28°C
per decade (CMIP6)
🌡️ Halong Bay has warmed by +0.5°C since 1995. By 2040, an additional +0.5°C is projected (based on CMIP6 rate of 0.282°C/decade), for a total of +0.9°C from 1995 baseline.
NASA POWER (1995-2024) + CMIP6 (CMCC_CM2_VHR4, EC_Earth3P_HR, FGOALS_f3_H, HiRAM_SIT_HR, MRI_AGCM3_2_S, NICAM16_8S)
Travel Intelligence
Exclusive flight analytics & health data for Halong Bay
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Airport-to-Airport Logistics
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Flight Connectivity Analysis
Airport traffic data & seasonal patterns
Off the beaten path
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Peak
Jul
Low
Dec
Monthly Traffic Distribution
Key Connections
Health & Safety Advisory
CDC travel health recommendations
COVID-19
All eligible travelers should be up to date with their COVID-19 vaccines. Please seeYour COVID-19 Vaccinationfor more information.
Chikungunya
All travelers should take steps to prevent mosquito bites. Chikungunya vaccination is generally not recommended. Travelers who wish to consider vaccination can visit “What to consider before traveling” on thechikungunya vaccinespage to learn more.
Hepatitis A
Recommended for unvaccinated travelers one year old or older going to Vietnam.Infants 6 to 11 months old should also be vaccinated against Hepatitis A. The dose does not count toward the routine 2-dose series.Travelers allergic to a vaccine component should receive a single dose of immune globulin, which provides effective protection for up to 2 months depending on dosage given.Unvaccinated travelers who are over 40 years old, are immunocompromised, or have chronic medical conditions planning to depart to a risk area in less than 2 weeks should get the initial dose of vaccine and at the same appointment receive immune globulin.
Hepatitis B
Recommended for unvaccinated travelers of all ages traveling to Vietnam.
Japanese Encephalitis
Recommended for travelers whoAre moving to an area with Japanese encephalitis to liveSpend long periods of time, such as a month or more, in areas with Japanese encephalitisFrequently travel to areas with Japanese encephalitisConsider vaccination for travelersSpending less than a month in areas with Japanese encephalitis but will be doing activities that increase risk of infection, such as visiting rural areas, hiking or camping, or staying in places without air conditioning, screens, or bed netsGoing to areas with Japanese encephalitis who are uncertain of their activities or how long they will be thereNot recommended for travelers planning short-term travel to urban areas or travel to areas with no clear Japanese encephalitis season.
Malaria
CDC recommends that travelers going to certain areas of Vietnam take prescription medicine to prevent malaria. Depending on the medicine you take, you will need to start taking this medicine multiple days before your trip, as well as during and after your trip. Talk to your doctor about which malaria medication you should take.Transmission areasRural areas only; rare cases in the Mekong and Red River DeltasNone in the cities of Da Nang, Hai Phong, Hanoi, Ho Chi Minh City (Saigon), Nha Trang, and Quy NhonDrug resistanceChloroquine and mefloquineSpeciesP. vivax(55%)P. falciparum(44%)P. knowlesi,6P. malariae, andP. ovale(rare)Recommended chemoprophylaxisProvinces of Bình Dương, Bình Phước, Đắk Lắk, Đắk Nông, Gia Lai, Khánh Hòa, Kon Tum, Lâm Đồng, Ninh Thuận, Tây Ninh: Atovaquone-proguanil, doxycycline, tafenoquine2All other areas with malaria transmission (except Mekong and Red River Deltas): Atovaquone-proguanil, doxycycline, mefloquine, tafenoquine2Mekong and Red River Deltas: No chemoprophylaxis recommended (insect bite precautions and mosquito avoidance only)4Updated April 23, 2025See footnotes
+4 more
Source: CDC Travelers' Health
View Complete Health GuideHalong Bay Climate Data by Month
Historical temperature and precipitation averages
| Month | Avg High (°C) | Rain Probability (%) | Status |
|---|---|---|---|
| January | 19°C | 11% | 😊 Pleasant |
| February | 20°C | 11% | ✨ Perfect |
| March | 23°C | 15% | ✨ Perfect |
| April | 27°C | 22% | ✨ Perfect |
| May | 29°C | 48% | 🌧️ Rainy |
| June | 31°C | 64% | 🌧️ Rainy |
| July | 31°C | 66% | 🌧️ Rainy |
| August | 30°C | 73% | 🌧️ Rainy |
| September | 30°C | 59% | 🌧️ Rainy |
| October | 28°C | 25% | 😊 Pleasant |
| November | 25°C | 15% | ✨ Perfect |
| December | 21°C | 8% | ✨ Perfect |
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Compare weather conditions with nearby destinations for your trip planning
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Halong Bay Weather FAQ
When is the best time to visit Halong Bay?
Honestly, look for months with mild temperatures (20°C-25°C) and low rain chance. Based on historical data, January, February, March are usually great choices.
When is the hottest month in Halong Bay?
July is historically the hottest month in Halong Bay with average highs of 31°C.
When does it rain the most in Halong Bay?
August typically sees the highest probability of rain (73%).
Is Halong Bay expensive?
Prices vary by season. The "Perfect" weather months usually coincide with peak tourist season and higher prices, while the rainy or cold months offer better deals.