Climate averages 1991–2020
Hạ Long weather
in May.
A hot, very wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Hạ Long: daytime highs average 29.3°C and nights cool to about 24.8°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 219 mm of rain on roughly 20 days, which makes May a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 07 min on an average May day.
The nearest other city in this atlas is Cẩm Phả (22 km away). In May its highs average 28.7°C, 0.6°C cooler than Hạ Long, with 200 mm of rain.
Among the 136 cities listed in Vietnam, Hạ Long ranks joint 124th of 136 for the warmest May highs and joint 93rd of 136 for the driest May (rainfall, lowest first). The mean May high of those 136 cities is 31.2°C; Hạ Long is 1.9°C cooler than that mean.
From May to June, average highs rise by 1.5°C to 30.8°C, and monthly rainfall rises from 219 mm to 266 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hạ Long climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.1°C14.6°C | 14.6°C | 34 | 6.4 | 11.011 h |
| February | 20.5°C15.8°C | 15.8°C | 21 | 5.7 | 11.411 h |
| March | 23.2°C18.5°C | 18.5°C | 43 | 8.8 | 12.012 h |
| April | 26.7°C21.8°C | 21.8°C | 69 | 11.6 | 12.613 h |
| May, selected | 29.3°C24.8°C | 24.8°C | 219 | 19.5 | 13.113 h |
| June | 30.8°C26.8°C | 26.8°C | 266 | 22.4 | 13.413 h |
| July | 30.7°C26.8°C | 26.8°C | 305 | 24.3 | 13.313 h |
| August | 30.4°C26.1°C | 26.1°C | 381 | 26.2 | 12.813 h |
| September | 29.6°C25.0°C | 25.0°C | 243 | 20.0 | 12.312 h |
| October | 27.8°C22.9°C | 22.9°C | 104 | 11.9 | 11.712 h |
| November | 24.8°C19.6°C | 19.6°C | 51 | 8.2 | 11.211 h |
| December | 20.8°C15.8°C | 15.8°C | 31 | 5.9 | 10.911 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Cẩm Phả in MayVietnam · 22 kmHigh 28.7°C · Low 24.7°C · 200 mm rain
- Haiphong in MayVietnam · 42 kmHigh 30.1°C · Low 24.7°C · 207 mm rain
- Kiến An in MayVietnam · 49 kmHigh 30.0°C · Low 24.9°C · 207 mm rain
- Thị Trấn Mạo Khê in MayVietnam · 51 kmHigh 30.7°C · Low 24.5°C · 241 mm rain
- Thị Trấn Đông Triều in MayVietnam · 60 kmHigh 30.7°C · Low 24.4°C · 241 mm rain
- Chũ in MayVietnam · 71 kmHigh 30.2°C · Low 23.6°C · 254 mm rain
- Hải Dương in MayVietnam · 77 kmHigh 30.9°C · Low 24.5°C · 244 mm rain
- Chí Linh in MayVietnam · 80 kmHigh 30.9°C · Low 24.3°C · 244 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hạ Long) is explained once on the Hạ Long year overview and on the Sources, method and limits page.