Ha Long Bay, Vietnam: Annual Weather Averages
June is the hottest month in Ha Long Bay with an average temperature of 29°C (84°F) and the coldest is January at 17°C (63°F) with the most daily sunshine hours at 8 in December. The wettest month is August with an average of 265mm of rain. The best month to swim in the sea is in January when the average sea temperature is 29°C (84°F).
Average Temperature: Ha Long Bay
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 17 | 18 | 20 | 23 | 28 | 29 | 29 | 29 | 28 | 25 | 22 | 19 |
| °F | 63 | 64 | 67 | 73 | 82 | 84 | 84 | 83 | 82 | 76 | 72 | 65 |
Average High/Low Temperature: Ha Long Bay
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °C | 20 | 21 | 23 | 27 | 30 | 30 | 31 | 32 | 31 | 28 | 24 | 21 |
| Low °C | 14 | 15 | 18 | 21 | 24 | 24 | 25 | 25 | 24 | 21 | 18 | 15 |
| High °F | 68 | 70 | 73 | 81 | 86 | 86 | 88 | 90 | 88 | 82 | 75 | 70 |
| Low °F | 57 | 59 | 64 | 70 | 75 | 75 | 77 | 77 | 75 | 70 | 64 | 59 |
Average Rainfall: Ha Long Bay
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 3 | 22 | 53 | 57 | 175 | 172 | 201 | 265 | 190 | 54 | 12 | 23 |
| Days | 10 | 11 | 13 | 13 | 14 | 15 | 15 | 16 | 14 | 11 | 8 | 7 |
Average Daily Sunshine Hours: Ha Long Bay
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hours | 7 | 7 | 8 | 8 | 8 | 8 | 7 | 6 | 7 | 7 | 8 | 8 |
Average Sea Temperature: Ha Long Bay
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| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 29 | 29 | 29 | 29 | 28 | 27 | 27 | 26 | 27 | 27 | 28 | 29 |
| °F | 84 | 84 | 84 | 84 | 82 | 81 | 81 | 79 | 81 | 81 | 82 | 84 |
