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Laguna Grande in December 2026: darkest nights

Reached by kayak through a mangrove channel. The easiest bio bay to reach from San Juan. Year-round.

16 pitch-dark nights, 18 dark nights

New moon Tue 8 Dec · Full moon Wed 23 Dec

Night by night, December 2026

NightMoon18:3020:30Best
Tue 1 Dec 41%●●●●●●●●●●20:30
Wed 2 Dec 31%●●●●●●●●●●20:30
Thu 3 Dec 21%●●●●●●●●●●20:30
Fri 4 Dec 13%●●●●●●●●●●20:30
Sat 5 Dec 7%●●●●●●●●●●20:30
Sun 6 Dec 3%●●●●●●●●●●20:30
Mon 7 Dec 1%●●●●●●●●●●20:30
Tue 8 Dec 0%●●●●●●●●●●20:30
Wed 9 Dec 1%●●●●●●●●●●20:30
Thu 10 Dec 4%●●●●●●●●●●20:30
Fri 11 Dec 9%●●●●●●●●●●20:30
Sat 12 Dec 15%●●●●●●●●●●20:30
Sun 13 Dec 22%●●●●●●●●●●20:30
Mon 14 Dec 31%●●●●●●●●●●20:30
Tue 15 Dec 41%●●●●●●●●●●20:30
Wed 16 Dec 51%●●●●●●●●●●20:30
Thu 17 Dec 61%●●●●●●●●●●20:30
Fri 18 Dec 72%●●●●●●●●●●20:30
Sat 19 Dec 81%●●●●●●●●●●20:30
Sun 20 Dec 89%●●●●●●●●●●20:30
Mon 21 Dec 95%●●●●●●●●●●20:30
Tue 22 Dec 99%●●●●●●●●●●18:30
Wed 23 Dec 100%●●●●●●●●●●18:30
Thu 24 Dec 98%●●●●●●●●●●18:30
Fri 25 Dec 94%●●●●●●●●●●18:30
Sat 26 Dec 87%●●●●●●●●●●18:30
Sun 27 Dec 79%●●●●●●●●●●20:30
Mon 28 Dec 69%●●●●●●●●●●20:30
Tue 29 Dec 58%●●●●●●●●●●20:30
Wed 30 Dec 47%●●●●●●●●●●20:30
Thu 31 Dec 37%●●●●●●●●●●20:30

Check one night in detail Laguna Grande tours

Questions

What are the best nights to see the bioluminescence at Laguna Grande in December 2026?

The darkest nights are Tue 1 Dec, Wed 2 Dec, Thu 3 Dec, Fri 4 Dec, Sat 5 Dec, Sun 6 Dec, Mon 7 Dec, Tue 8 Dec, Wed 9 Dec, Thu 10 Dec and more. 18 of 31 nights score at least 4 out of 5.

Which nights should I avoid in December 2026?

Avoid the nights around the full moon on Wed 23 Dec, when moonlight washes out the glow.

18:30 or 20:30: which Laguna Grande tour is darker in December?

18:30 is the darker choice on 2 nights; 20:30 is the darker choice on 19 nights.

Laguna Grande 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/Puerto_Rico).