When to visit Halong Bay?
The decision rests on several criteria. Climate score, tourist crowds and feasible activities.
What you grasp in 5 seconds
Halong Bay offers 7 comfortable months, without any month really to avoid. The gap stays moderate: 8.6 in October vs 4.6 in August.
What to check next
Your tolerance for crowds and budget. The best months concentrate tourist saturation and higher prices. Shoulder seasons offer a good compromise.
Next action
Scroll down to the detailed table to compare month by month, then open the page of the month that interests you.
How we calculate the score
The score combines 4 weighted criteria using 10 years of real climate data (ERA5).
Source : ERA5 · Open-Meteo · 10 years (2016–2025) · Full methodology →
Compare all 12 months
Month-by-month details: temperature, rain, sunshine, score and verdict.
| Month | T° min | T° max | Rain % | mm/day | Sun | Score | Verdict |
|---|---|---|---|---|---|---|---|
| ☀️ January → | 61°F | 68°F | 15% | 1.5mm | 5.2h | 7.7/10 | Best period |
| ☀️ February → | 61°F | 70°F | 16% | 1.7mm | 4.6h | 7.6/10 | Best period |
| ☀️ March → | 66°F | 75°F | 17% | 1.4mm | 4.8h | 8.0/10 | Best period |
| ☀️ April → | 72°F | 79°F | 22% | 2.7mm | 6.2h | 8.3/10 | Best period |
| 🌥️ May → | 77°F | 84°F | 37% | 5.8mm | 6.2h | 5.3/10 | Decent period |
| 🌥️ June → | 81°F | 88°F | 50% | 8.8mm | 5.4h | 4.7/10 | Decent period |
| 🌥️ July → | 81°F | 88°F | 53% | 10.4mm | 5.6h | 4.7/10 | Decent period |
| 🌥️ August → | 79°F | 86°F | 62% | 14.3mm | 4.4h | 4.6/10 | Decent period |
| 🌥️ September → | 79°F | 86°F | 47% | 10.4mm | 5.6h | 5.0/10 | Decent period |
| ☀️ October → | 73°F | 82°F | 24% | 4.8mm | 6.8h | 8.6/10 | Best period |
| ☀️ November → | 68°F | 79°F | 14% | 1.3mm | 7.0h | 8.5/10 | Best period |
| ☀️ December → | 61°F | 72°F | 8% | 0.6mm | 6.5h | 8.2/10 | Best period |
Halong Bay week by week: your odds of avoiding rain
For each week of the year: in how many years out of 10 it was mostly dry (at most 2 rainy days), 2016 to 2025.
Safest week: Dec 17 to Dec 23, mostly dry in 10 years out of 10 (0.2 rainy day(s) on average).
Most exposed: Jul 30 to Aug 5, mostly dry in 1 years out of 10 (5.1 rainy days on average).
| Jan | Jan 110/1070°F | Jan 86/1068°F | Jan 159/1068°F | Jan 228/1066°F | Jan 2910/1067°F |
|---|---|---|---|---|---|
| Feb | Feb 58/1067°F | Feb 128/1070°F | Feb 199/1069°F | Feb 269/1071°F | |
| Mar | Mar 59/1072°F | Mar 127/1074°F | Mar 1910/1076°F | Mar 269/1075°F | |
| Apr | Apr 210/1078°F | Apr 98/1079°F | Apr 167/1081°F | Apr 237/1081°F | Apr 308/1082°F |
| May | May 75/1084°F | May 146/1084°F | May 211/1085°F | May 285/1087°F | |
| Jun | Jun 41/1087°F | Jun 112/1088°F | Jun 185/1088°F | Jun 252/1087°F | |
| Jul | Jul 22/1087°F | Jul 93/1088°F | Jul 163/1087°F | Jul 232/1087°F | Jul 301/1087°F |
| Aug | Aug 62/1088°F | Aug 131/1086°F | Aug 201/1087°F | Aug 272/1087°F | |
| Sep | Sep 33/1087°F | Sep 102/1086°F | Sep 173/1086°F | Sep 244/1085°F | |
| Oct | Oct 16/1085°F | Oct 87/1083°F | Oct 157/1082°F | Oct 2210/1081°F | Oct 299/1080°F |
| Nov | Nov 510/1079°F | Nov 129/1079°F | Nov 199/1076°F | Nov 2610/1075°F | |
| Dec | Dec 39/1073°F | Dec 109/1071°F | Dec 1710/1069°F | Dec 2410/1069°F |
A specific date? The app computes the same figure day by day.
Annual temperatures — Halong Bay
Min/max temperature curves observed over the past 10 years (ERA5). Shows climate stability and trend.
For your trip
A few angles depending on what kind of trip you are planning.
Plan your trip
Hotels at their lowest outside peak season, highest on comfortable months. Shoulder seasons offer a good price/climate compromise.
🎟️ Activities & tours · Halong Bay
GetYourGuide selection · free cancellation
What you need to know before you go
Three angles: the country (language, currency, safety, budget), the year-round climate, and the specifics of a tropical stay.
Country · Vietnam
🌡️ Climate
🏝️ Tropical stay
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Where is Halong Bay ?
Global position + regional geographic context.