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Holbox bioluminescence in May 2027: darkest nights

Plankton glows along the lagoon shore and Punta Cocos. Very sensitive to moonlight. Best June to October, warm water.

16 pitch-dark nights, 18 dark nights

New moon Thu 6 May · Full moon Thu 20 May

Night by night, May 2027

NightMoon20:0022:00Best
Sat 1 May 19%●●●●●●●●●●22:00
Sun 2 May 12%●●●●●●●●●●22:00
Mon 3 May 6%●●●●●●●●●●22:00
Tue 4 May 2%●●●●●●●●●●22:00
Wed 5 May 0%●●●●●●●●●●22:00
Thu 6 May 1%●●●●●●●●●●22:00
Fri 7 May 4%●●●●●●●●●●22:00
Sat 8 May 10%●●●●●●●●●●22:00
Sun 9 May 17%●●●●●●●●●●22:00
Mon 10 May 27%●●●●●●●●●●22:00
Tue 11 May 38%●●●●●●●●●●22:00
Wed 12 May 50%●●●●●●●●●●22:00
Thu 13 May 62%●●●●●●●●●●22:00
Fri 14 May 73%●●●●●●●●●●22:00
Sat 15 May 82%●●●●●●●●●●22:00
Sun 16 May 90%●●●●●●●●●●22:00
Mon 17 May 95%●●●●●●●●●●22:00
Tue 18 May 99%●●●●●●●●●●20:00
Wed 19 May 100%●●●●●●●●●●20:00
Thu 20 May 99%●●●●●●●●●●20:00
Fri 21 May 96%●●●●●●●●●●20:00
Sat 22 May 92%●●●●●●●●●●20:00
Sun 23 May 86%●●●●●●●●●●20:00
Mon 24 May 79%●●●●●●●●●●22:00
Tue 25 May 71%●●●●●●●●●●22:00
Wed 26 May 62%●●●●●●●●●●22:00
Thu 27 May 53%●●●●●●●●●●22:00
Fri 28 May 43%●●●●●●●●●●22:00
Sat 29 May 33%●●●●●●●●●●22:00
Sun 30 May 24%●●●●●●●●●●22:00
Mon 31 May 16%●●●●●●●●●●22:00

Check one night in detail Holbox bioluminescence tours

Questions

What are the best nights to see the bioluminescence at Holbox bioluminescence 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, Tue 25 May and more. 18 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 Holbox bioluminescence tour is darker in May?

20:00 is the darker choice on 2 nights; 22:00 is the darker choice on 19 nights.

Holbox bioluminescence darkness by month

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