Ko Samui December weather
Ko Samui, Thailand · December
Keep backups, then take clear windows quickly
December can still keep rain as a real variable, though some years feel like conditions ease later in the month. It’s safer not to assume steady clear weather.
A practical approach is keeping indoor anchors and attaching beach/boat plans quickly when the sky opens.
December averages at a glance
Average low
around 24°C
Average high
around 29–30°C
Average rainfall
around 120–280 mm
Wet days
about 15–23 days
What to wear in December in Ko Samui
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Summer clothing + water-safe pouch works well.
- • Thin layer helps indoors with AC.
- • Wet-tolerant shoes are practical.
Travel tips for visiting Ko Samui in December
- • When it opens, do sea plans first; when it closes, pivot indoors.
- • If dampness is a big stressor, a spare tee can change the day.
December weather in Ko Samui — FAQ
Q. Is December better than November?
A. Sometimes, but it varies by year and timing. Treat it as ‘may improve’ rather than guaranteed.
Q. Are boat tours possible in December?
A. Often yes on suitable days, but conditions vary. A Plan B makes it easier.
Explore Ko Samui
These pages are connected so you can compare conditions and decide for yourself.