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Laguna Grande in May 2027: 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 Thu 6 May · Full moon Thu 20 May

Night by night, May 2027

NightMoon18:3020:30Best
Sat 1 May 20%●●●●●●●●●●20:30
Sun 2 May 13%●●●●●●●●●●20:30
Mon 3 May 7%●●●●●●●●●●20:30
Tue 4 May 2%●●●●●●●●●●20:30
Wed 5 May 0%●●●●●●●●●●20:30
Thu 6 May 1%●●●●●●●●●●20:30
Fri 7 May 4%●●●●●●●●●●20:30
Sat 8 May 9%●●●●●●●●●●20:30
Sun 9 May 17%●●●●●●●●●●20:30
Mon 10 May 26%●●●●●●●●●●20:30
Tue 11 May 38%●●●●●●●●●●20:30
Wed 12 May 49%●●●●●●●●●●20:30
Thu 13 May 61%●●●●●●●●●●20:30
Fri 14 May 72%●●●●●●●●●●20:30
Sat 15 May 81%●●●●●●●●●●20:30
Sun 16 May 89%●●●●●●●●●●20:30
Mon 17 May 95%●●●●●●●●●●20:30
Tue 18 May 98%●●●●●●●●●●18:30
Wed 19 May 100%●●●●●●●●●●18:30
Thu 20 May 99%●●●●●●●●●●20:30
Fri 21 May 97%●●●●●●●●●●20:30
Sat 22 May 93%●●●●●●●●●●20:30
Sun 23 May 87%●●●●●●●●●●20:30
Mon 24 May 80%●●●●●●●●●●20:30
Tue 25 May 72%●●●●●●●●●●20:30
Wed 26 May 63%●●●●●●●●●●20:30
Thu 27 May 54%●●●●●●●●●●20:30
Fri 28 May 44%●●●●●●●●●●20:30
Sat 29 May 34%●●●●●●●●●●20:30
Sun 30 May 25%●●●●●●●●●●20:30
Mon 31 May 16%●●●●●●●●●●20:30

Check one night in detail Laguna Grande tours

Questions

What are the best nights to see the bioluminescence at Laguna Grande 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, Mon 24 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.

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

18:30 is the darker choice on 0 nights; 20:30 is the darker choice on 20 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).