Like The Photo

Koh Rong plankton in December 2026: darkest nights

Swim off Long Set Beach or from night boat trips on Koh Rong Samloem. Year-round; best in the dry season.

18 pitch-dark nights, 20 dark nights

New moon Wed 9 Dec · Full moon Thu 24 Dec

Night by night, December 2026

NightMoon20:0022:00Best
Tue 1 Dec 47%●●●●●●●●●●20:00
Wed 2 Dec 36%●●●●●●●●●●20:00
Thu 3 Dec 26%●●●●●●●●●●20:00
Fri 4 Dec 17%●●●●●●●●●●20:00
Sat 5 Dec 10%●●●●●●●●●●20:00
Sun 6 Dec 5%●●●●●●●●●●20:00
Mon 7 Dec 2%●●●●●●●●●●20:00
Tue 8 Dec 0%●●●●●●●●●●20:00
Wed 9 Dec 1%●●●●●●●●●●20:00
Thu 10 Dec 3%●●●●●●●●●●20:00
Fri 11 Dec 6%●●●●●●●●●●20:00
Sat 12 Dec 12%●●●●●●●●●●22:00
Sun 13 Dec 19%●●●●●●●●●●22:00
Mon 14 Dec 27%●●●●●●●●●●22:00
Tue 15 Dec 36%●●●●●●●●●●22:00
Wed 16 Dec 46%●●●●●●●●●●22:00
Thu 17 Dec 56%●●●●●●●●●●22:00
Fri 18 Dec 67%●●●●●●●●●●22:00
Sat 19 Dec 76%●●●●●●●●●●20:00
Sun 20 Dec 85%●●●●●●●●●●20:00
Mon 21 Dec 92%●●●●●●●●●●20:00
Tue 22 Dec 97%●●●●●●●●●●20:00
Wed 23 Dec 100%●●●●●●●●●●20:00
Thu 24 Dec 99%●●●●●●●●●●20:00
Fri 25 Dec 96%●●●●●●●●●●20:00
Sat 26 Dec 91%●●●●●●●●●●20:00
Sun 27 Dec 83%●●●●●●●●●●20:00
Mon 28 Dec 74%●●●●●●●●●●20:00
Tue 29 Dec 63%●●●●●●●●●●20:00
Wed 30 Dec 52%●●●●●●●●●●20:00
Thu 31 Dec 42%●●●●●●●●●●20:00

Check one night in detail Koh Rong plankton tours

Questions

What are the best nights to see the bioluminescence at Koh Rong plankton in December 2026?

The darkest nights are Tue 1 Dec, Wed 2 Dec, Thu 3 Dec, Fri 4 Dec, Sat 5 Dec, Sun 6 Dec, Mon 7 Dec, Tue 8 Dec, Wed 9 Dec, Thu 10 Dec and more. 20 of 31 nights score at least 4 out of 5.

Which nights should I avoid in December 2026?

Avoid the nights around the full moon on Thu 24 Dec, when moonlight washes out the glow.

20:00 or 22:00: which Koh Rong plankton tour is darker in December?

20:00 is the darker choice on 16 nights; 22:00 is the darker choice on 5 nights.

Koh Rong plankton darkness by month

Darkness score 1-5 per tour slot from twilight and moonlight. Weather and plankton health are not included. Times are local (Asia/Phnom_Penh).