Ha Long Bay: Weather Guide & Climate
Complete month-by-month weather guide: Ha Long Bay. Best time to visit: March, April, May, September, October, November. Plan your trip with detailed climate data.
☀️ Climate Overview
Ha Long Bay has a Moderate climate with average yearly highs of 28°C, lows of 23°C, and approximately 15 rainy days per month.
The best time to visit Ha Long Bay is during March, April, May, September, October, November, when conditions are perfect for sightseeing and exploration
Drier season: Jan–Dec Wetter season: May–Oct
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Air Quality
Hottest
Coldest
Driest Month
Windiest Month
17 km/h
June (gusts 36)
Sea Temp Range
18° – 32°C
Warmest water: July (32°C)
Best for swimming: Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec (21°–32°C)
Forecast for your trip dates
Up to 14 days aheadWeather by Season
Spring
Mar–May
Summer
Jun–Aug
Autumn
Sep–Nov
Winter
Dec–Feb
Month-by-Month Weather Table
January
February
March
BestApril
BestMay
BestJune
July
August
September
BestOctober
BestNovember
BestDecember
| Month | High | Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition | View Details |
|---|---|---|---|---|---|---|---|---|---|
| January | 21°C | 16°C | 7d (34mm) | 6.4h | 76% Humid | 4.1 Moderate | | Good | View Details → |
| February | 21°C | 17°C | 6d (33mm) | 5.7h | 82% Very Humid | 4.4 Moderate | | Good | View Details → |
| March (best) | 24°C | 20°C | 10d (31mm) | 6.7h | 84% Very Humid | 5.3 High | | Excellent | View Details → |
| April (best) | 27°C | 23°C | 11d (59mm) | 8.7h | 83% Very Humid | 6.8 High | | Excellent | View Details → |
| May (best) | 31°C | 26°C | 20d (154mm) | 9.7h | 83% Very Muggy | 7.4 Very High | | Excellent | View Details → |
| June | 33°C | 28°C | 22d (271mm) | 8.7h | 82% Very Muggy | 7.3 Very High | | Wet | View Details → |
| July | 33°C | 28°C | 23d (280mm) | 9.7h | 83% Very Muggy | 7.7 Very High | | Wet | View Details → |
| August | 32°C | 27°C | 28d (400mm) | 7.7h | 85% Very Muggy | 6.4 High | | Wet | View Details → |
| September (best) | 31°C | 26°C | 26d (366mm) | 7.8h | 84% Very Muggy | 6 High | | Excellent | View Details → |
| October (best) | 29°C | 23°C | 14d (156mm) | 8.1h | 76% Muggy | 5.9 High | | Excellent | View Details → |
| November (best) | 27°C | 21°C | 7d (32mm) | 8.4h | 74% Humid | 5.3 High | | Excellent | View Details → |
| December | 22°C | 17°C | 3d (12mm) | 7.1h | 69% Humid | 4.4 Moderate | | Good | View Details → |
Ha Long Bay
UNESCO World Heritage Bay with 1,600 limestone karst islands rising dramatically from emerald waters, overnight junk boat cruises, kayaking through caves, floating villages, and one of Vietnam's most iconic natural wonders.
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Frequently Asked Questions
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More Ha Long Bay Guides
Best Time to Visit
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Things to Do
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Cost & Budget
Daily costs, money-saving tips, and budget breakdown
Itineraries
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Overview
Complete travel guide for Ha Long Bay: top things to do, itineraries, and typical costs.