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Grand Cayman Bio Bay in February 2027: darkest nights

Boat tours leave from Rum Point and Kaibo. Operators cancel on bright full-moon nights. Year-round.

14 pitch-dark nights, 15 dark nights

New moon Sat 6 Feb · Full moon Sat 20 Feb

Night by night, February 2027

NightMoon19:0020:30Best
Mon 1 Feb 17%●●●●●●●●●●20:30
Tue 2 Feb 11%●●●●●●●●●●20:30
Wed 3 Feb 5%●●●●●●●●●●20:30
Thu 4 Feb 2%●●●●●●●●●●20:30
Fri 5 Feb 0%●●●●●●●●●●20:30
Sat 6 Feb 0%●●●●●●●●●●20:30
Sun 7 Feb 2%●●●●●●●●●●20:30
Mon 8 Feb 6%●●●●●●●●●●20:30
Tue 9 Feb 12%●●●●●●●●●●20:30
Wed 10 Feb 20%●●●●●●●●●●20:30
Thu 11 Feb 29%●●●●●●●●●●20:30
Fri 12 Feb 39%●●●●●●●●●●20:30
Sat 13 Feb 51%●●●●●●●●●●20:30
Sun 14 Feb 62%●●●●●●●●●●20:30
Mon 15 Feb 73%●●●●●●●●●●20:30
Tue 16 Feb 83%●●●●●●●●●●20:30
Wed 17 Feb 91%●●●●●●●●●●20:30
Thu 18 Feb 96%●●●●●●●●●●20:30
Fri 19 Feb 99%●●●●●●●●●●19:00
Sat 20 Feb 100%●●●●●●●●●●19:00
Sun 21 Feb 98%●●●●●●●●●●19:00
Mon 22 Feb 93%●●●●●●●●●●19:00
Tue 23 Feb 87%●●●●●●●●●●19:00
Wed 24 Feb 79%●●●●●●●●●●20:30
Thu 25 Feb 70%●●●●●●●●●●20:30
Fri 26 Feb 60%●●●●●●●●●●20:30
Sat 27 Feb 50%●●●●●●●●●●20:30
Sun 28 Feb 41%●●●●●●●●●●20:30

Check one night in detail Grand Cayman Bio Bay tours

Questions

What are the best nights to see the bioluminescence at Grand Cayman Bio Bay in February 2027?

The darkest nights are Mon 1 Feb, Tue 2 Feb, Wed 3 Feb, Thu 4 Feb, Fri 5 Feb, Sat 6 Feb, Sun 7 Feb, Mon 8 Feb, Tue 9 Feb, Wed 24 Feb and more. 15 of 28 nights score at least 4 out of 5.

Which nights should I avoid in February 2027?

Avoid the nights around the full moon on Sat 20 Feb, when moonlight washes out the glow.

19:00 or 20:30: which Grand Cayman Bio Bay tour is darker in February?

19:00 is the darker choice on 2 nights; 20:30 is the darker choice on 16 nights.

Grand Cayman Bio Bay 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/Cayman).