Halong has two main seasons: hot with sporadic rain from April to September and cool with some chilly wind from October to March. So it depends on your preference to decide the best month to visit Halong Bay.
Warm Spring (March and April)
Temperatures during the spring season range from 19°C to 31°C. There is still the possibility of rainy and foggy conditions during the spring months, but the fog is not as thick as in the winter.
Spring is the time of flowers blooming and swallows flying over the bay. The bay becomes more inviting in April and remains attractive to tourists till the summer. In the spring, the sun shines constantly all day, and the water is gentle and calm. With this weather, tourist can truly experience the best of Halong as they are cruising slowly around and staring at the breathtaking scenery.
Hot and Moist Summer (May to August)
In the summer, the average temperature is 34,9°C; while the maximum temperature recorded is 38°C. Summer brings clear views of the stunning islands and pleasant swimming temperatures, which is an ideal time for cruising. At this time, the sun shines from very early morning until as late as 7 p.m in Halong, which makes you feel the daytime is longer than the nighttime.
Summer also gives you a perfect chance to have sun-tanned skin. However, do not sunbathing at noon. vToo much sun exposure can probably cause heat exhaustion, heat stroke, or sunburn.
If you travel to Halong Bay from July to August, there may be infrequent typhoons, which may render cancellation or delay of your trip. Most of the time, storms and typhoons are small, and they last in a very short time for about 2 or 3 days, and thus considered to be harmless. In case of a big storm, be sure to contact your agent for alternative solutions.
Cool autumn (September and October)
Summer ends with the transformation of weather. The average temperature is lower than 27°C, so you can enjoy the cool and pleasant atmosphere.
From October onwards, it is the ideal time for tourists to take a cruise on the bay. The wonderful weather will enable you to enjoy all activities offered on board while making sightseeing as perfect as it could be. Autumn is also perfect for couples or small families to have private life-time experiences together while sailing through Halong Bay.
Cold and Dry Winter (November to February)
Ha Long Bay enjoys a dry and cold winter. The winter officially arrives at Halong Bay in November and gets colder and colder in January and February. The highest temperature reaches to only 20°C, while the temperature can drop to about 8°C. It is possible to take a boat cruise in Halong Bay in winter. Although swimming is not suitable, there are a lot of exciting activities in this season. Thick fog possesses a mystery beauty.
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