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

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