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Grand Cayman Bio Bay in January 2027: darkest nights

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

17 pitch-dark nights, 19 dark nights

New moon Thu 7 Jan · Full moon Fri 22 Jan

Night by night, January 2027

NightMoon19:0020:30Best
Fri 1 Jan 27%●●●●●●●●●●20:30
Sat 2 Jan 19%●●●●●●●●●●20:30
Sun 3 Jan 12%●●●●●●●●●●20:30
Mon 4 Jan 6%●●●●●●●●●●20:30
Tue 5 Jan 3%●●●●●●●●●●20:30
Wed 6 Jan 0%●●●●●●●●●●20:30
Thu 7 Jan 0%●●●●●●●●●●20:30
Fri 8 Jan 2%●●●●●●●●●●20:30
Sat 9 Jan 5%●●●●●●●●●●20:30
Sun 10 Jan 10%●●●●●●●●●●20:30
Mon 11 Jan 16%●●●●●●●●●●20:30
Tue 12 Jan 25%●●●●●●●●●●20:30
Wed 13 Jan 34%●●●●●●●●●●20:30
Thu 14 Jan 45%●●●●●●●●●●20:30
Fri 15 Jan 55%●●●●●●●●●●20:30
Sat 16 Jan 66%●●●●●●●●●●20:30
Sun 17 Jan 77%●●●●●●●●●●20:30
Mon 18 Jan 86%●●●●●●●●●●20:30
Tue 19 Jan 93%●●●●●●●●●●20:30
Wed 20 Jan 98%●●●●●●●●●●20:30
Thu 21 Jan 100%●●●●●●●●●●19:00
Fri 22 Jan 99%●●●●●●●●●●19:00
Sat 23 Jan 96%●●●●●●●●●●19:00
Sun 24 Jan 90%●●●●●●●●●●19:00
Mon 25 Jan 83%●●●●●●●●●●20:30
Tue 26 Jan 74%●●●●●●●●●●20:30
Wed 27 Jan 64%●●●●●●●●●●20:30
Thu 28 Jan 54%●●●●●●●●●●20:30
Fri 29 Jan 43%●●●●●●●●●●20:30
Sat 30 Jan 34%●●●●●●●●●●20:30
Sun 31 Jan 25%●●●●●●●●●●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 January 2027?

The darkest nights are Fri 1 Jan, Sat 2 Jan, Sun 3 Jan, Mon 4 Jan, Tue 5 Jan, Wed 6 Jan, Thu 7 Jan, Fri 8 Jan, Sat 9 Jan, Sun 10 Jan and more. 19 of 31 nights score at least 4 out of 5.

Which nights should I avoid in January 2027?

Avoid the nights around the full moon on Fri 22 Jan, when moonlight washes out the glow.

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

19:00 is the darker choice on 1 nights; 20:30 is the darker choice on 20 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).