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Koh Rong plankton in May 2027: 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 Thu 6 May · Full moon Thu 20 May

Night by night, May 2027

NightMoon20:0022:00Best
Sat 1 May 24%●●●●●●●●●●20:00
Sun 2 May 16%●●●●●●●●●●20:00
Mon 3 May 9%●●●●●●●●●●20:00
Tue 4 May 4%●●●●●●●●●●20:00
Wed 5 May 1%●●●●●●●●●●20:00
Thu 6 May 0%●●●●●●●●●●20:00
Fri 7 May 2%●●●●●●●●●●20:00
Sat 8 May 6%●●●●●●●●●●22:00
Sun 9 May 13%●●●●●●●●●●22:00
Mon 10 May 22%●●●●●●●●●●22:00
Tue 11 May 32%●●●●●●●●●●22:00
Wed 12 May 44%●●●●●●●●●●22:00
Thu 13 May 56%●●●●●●●●●●22:00
Fri 14 May 67%●●●●●●●●●●22:00
Sat 15 May 77%●●●●●●●●●●20:00
Sun 16 May 86%●●●●●●●●●●20:00
Mon 17 May 92%●●●●●●●●●●20:00
Tue 18 May 97%●●●●●●●●●●20:00
Wed 19 May 99%●●●●●●●●●●20:00
Thu 20 May 100%●●●●●●●●●●20:00
Fri 21 May 98%●●●●●●●●●●20:00
Sat 22 May 95%●●●●●●●●●●20:00
Sun 23 May 90%●●●●●●●●●●20:00
Mon 24 May 83%●●●●●●●●●●20:00
Tue 25 May 76%●●●●●●●●●●20:00
Wed 26 May 67%●●●●●●●●●●20:00
Thu 27 May 58%●●●●●●●●●●20:00
Fri 28 May 48%●●●●●●●●●●20:00
Sat 29 May 39%●●●●●●●●●●20:00
Sun 30 May 29%●●●●●●●●●●20:00
Mon 31 May 20%●●●●●●●●●●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 May 2027?

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

Which nights should I avoid in May 2027?

Avoid the nights around the full moon on Thu 20 May, when moonlight washes out the glow.

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

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).