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Koh Rong plankton in September 2027: darkest nights

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

15 pitch-dark nights, 17 dark nights

New moon Thu 30 Sep · Full moon Thu 16 Sep

Night by night, September 2027

NightMoon20:0022:00Best
Wed 1 Sep 1%●●●●●●●●●●20:00
Thu 2 Sep 5%●●●●●●●●●●20:00
Fri 3 Sep 12%●●●●●●●●●●22:00
Sat 4 Sep 20%●●●●●●●●●●22:00
Sun 5 Sep 29%●●●●●●●●●●22:00
Mon 6 Sep 39%●●●●●●●●●●22:00
Tue 7 Sep 49%●●●●●●●●●●22:00
Wed 8 Sep 59%●●●●●●●●●●22:00
Thu 9 Sep 68%●●●●●●●●●●22:00
Fri 10 Sep 76%●●●●●●●●●●22:00
Sat 11 Sep 84%●●●●●●●●●●20:00
Sun 12 Sep 90%●●●●●●●●●●20:00
Mon 13 Sep 95%●●●●●●●●●●20:00
Tue 14 Sep 98%●●●●●●●●●●20:00
Wed 15 Sep 100%●●●●●●●●●●20:00
Thu 16 Sep 99%●●●●●●●●●●20:00
Fri 17 Sep 97%●●●●●●●●●●20:00
Sat 18 Sep 93%●●●●●●●●●●20:00
Sun 19 Sep 87%●●●●●●●●●●20:00
Mon 20 Sep 78%●●●●●●●●●●20:00
Tue 21 Sep 69%●●●●●●●●●●20:00
Wed 22 Sep 58%●●●●●●●●●●20:00
Thu 23 Sep 46%●●●●●●●●●●20:00
Fri 24 Sep 35%●●●●●●●●●●20:00
Sat 25 Sep 24%●●●●●●●●●●20:00
Sun 26 Sep 15%●●●●●●●●●●20:00
Mon 27 Sep 7%●●●●●●●●●●20:00
Tue 28 Sep 2%●●●●●●●●●●20:00
Wed 29 Sep 0%●●●●●●●●●●20:00
Thu 30 Sep 1%●●●●●●●●●●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 September 2027?

The darkest nights are Wed 1 Sep, Thu 2 Sep, Fri 3 Sep, Sat 4 Sep, Sun 5 Sep, Tue 21 Sep, Wed 22 Sep, Thu 23 Sep, Fri 24 Sep, Sat 25 Sep and more. 17 of 30 nights score at least 4 out of 5.

Which nights should I avoid in September 2027?

Avoid the nights around the full moon on Thu 16 Sep, when moonlight washes out the glow.

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

20:00 is the darker choice on 13 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).