Climate Insights for Hạ Long

The climate in Hạ Long is warm and mild. The average annual temperature is 24°C and approximately 1940mm of precipitation falls per year. August is the wettest month, receiving around 464mm of rainfall. Hạ Long is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: June, July, August. The coldest months are January, February, December, when temperatures can drop to 15°C.

Hạ Long sees moderate temperature variation throughout the year, ranging from 15°C to 32°C. The warmest month is June, when average highs reach 32°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 15°C and an average of 17°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between November and December, with a 4°C shift in average temperatures.

Hạ Long is a fairly wet location, receiving approximately 1940mm of precipitation annually, which averages out to around 162mm per month. The wettest month is August, averaging 464mm of rainfall. July and September also tend to see above-average precipitation. The driest month is December, with just 21mm. That's 443mm less than August, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Hạ Long is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently autumn in Hạ Long, which began on September 23, 2026. Hạ Long is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in June at around 32°C, while the coldest stretch bottoms out in January near 15°C. Winter is next, beginning on December 21, 2026 (87 days from now).

The best time to visit Hạ Long is during January, February, March, April, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 41mm per month. By contrast, June can be uncomfortably hot with temperatures reaching 32°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Hạ Long based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.