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Laguna Grande in September 2027: darkest nights

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

14 pitch-dark nights, 16 dark nights

New moon Wed 29 Sep · Full moon Wed 15 Sep

Night by night, September 2027

NightMoon18:3020:30Best
Wed 1 Sep 3%●●●●●●●●●●20:30
Thu 2 Sep 8%●●●●●●●●●●20:30
Fri 3 Sep 15%●●●●●●●●●●20:30
Sat 4 Sep 24%●●●●●●●●●●20:30
Sun 5 Sep 33%●●●●●●●●●●20:30
Mon 6 Sep 43%●●●●●●●●●●20:30
Tue 7 Sep 53%●●●●●●●●●●20:30
Wed 8 Sep 63%●●●●●●●●●●20:30
Thu 9 Sep 72%●●●●●●●●●●20:30
Fri 10 Sep 80%●●●●●●●●●●20:30
Sat 11 Sep 87%●●●●●●●●●●20:30
Sun 12 Sep 93%●●●●●●●●●●20:30
Mon 13 Sep 97%●●●●●●●●●●20:30
Tue 14 Sep 99%●●●●●●●●●●18:30
Wed 15 Sep 100%●●●●●●●●●●18:30
Thu 16 Sep 99%●●●●●●●●●●18:30
Fri 17 Sep 95%●●●●●●●●●●18:30
Sat 18 Sep 90%●●●●●●●●●●18:30
Sun 19 Sep 83%●●●●●●●●●●20:30
Mon 20 Sep 74%●●●●●●●●●●20:30
Tue 21 Sep 64%●●●●●●●●●●20:30
Wed 22 Sep 52%●●●●●●●●●●20:30
Thu 23 Sep 41%●●●●●●●●●●20:30
Fri 24 Sep 30%●●●●●●●●●●20:30
Sat 25 Sep 19%●●●●●●●●●●20:30
Sun 26 Sep 11%●●●●●●●●●●20:30
Mon 27 Sep 5%●●●●●●●●●●20:30
Tue 28 Sep 1%●●●●●●●●●●20:30
Wed 29 Sep 0%●●●●●●●●●●20:30
Thu 30 Sep 2%●●●●●●●●●●20:30

Check one night in detail Laguna Grande tours

Questions

What are the best nights to see the bioluminescence at Laguna Grande in September 2027?

The darkest nights are Wed 1 Sep, Thu 2 Sep, Fri 3 Sep, Sat 4 Sep, Tue 21 Sep, Wed 22 Sep, Thu 23 Sep, Fri 24 Sep, Sat 25 Sep, Sun 26 Sep and more. 16 of 30 nights score at least 4 out of 5.

Which nights should I avoid in September 2027?

Avoid the nights around the full moon on Wed 15 Sep, when moonlight washes out the glow.

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

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