December · Vietnam
Best time to visit Cat Ba Island in December Weather, crowds & prices
Weather in Cat Ba Island in December
Average temperature 17°C, 13 mm of rain, about 5 days with 6+ hours of sunshine and 77% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
December score
7.6/10
Ranked #2 of 12 months
- Avg temp
- 17°C
- Rainfall
- 13 mm
- Humidity
- 77%
- Days with 6h+ sun
- 5
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
December in Cat Ba Island scores 7.6/10 for nature and wildlife travel - one of the top 12-month picks (#2). Expect around 17°C, 13 mm of rain, and roughly 5 days with 6+ hours of sunshine this month.
Largest island in Halong/Lan Ha Bay featuring rainforest national parks, bioluminescent plankton, and kayaking.
December holds up well in Cat Ba Island — 2nd best month
December averages 17°C (63°F), the range most people find easiest for walking a city all day without either overheating or losing daylight to weather.
Rain is a non-issue at 13 mm for the month, with about 5 days with 6+ hours of sunshine and 10.7 hours of daylight to work with.
It scores 7.6/10 here, 2nd of 12 months, against 7.9/10 in the destination's best month.
Pack layers you can shed by midday plus one warm layer for the evening, footwear you can get muddy.
Plan for peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Cat Ba Island in December?
- In December, Cat Ba Island averages 17°C, 13 mm of rain, and about 5 days with 6+ hours of sunshine. Its climate-comfort score is 7.6/10.
- Is December a good time to visit Cat Ba Island?
- December earns a 7.6/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Cat Ba Island in December?
- Expect about 13 mm of rain in December. Average humidity is 77% and there are about 5 days with 6+ hours of sunshine.
Curated in Cat Ba Island
Tickets & experiences
Things to do in Cat Ba Island
Cat Ba Island, Vietnam. Live activities and tours from GetYourGuide, matched to this destination.