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Mosquito Bay in July 2027: darkest nights

Guinness-listed as the brightest bioluminescent bay in the world. Swimming is banned; tours use clear-bottom kayaks or electric boats. Year-round. Brightest after a few dry, calm nights.

14 pitch-dark nights, 16 dark nights

New moon Sat 3 Jul · Full moon Sun 18 Jul

Night by night, July 2027

NightMoon19:0021:00Best
Thu 1 Jul 6%●●●●●●●●●●21:00
Fri 2 Jul 1%●●●●●●●●●●21:00
Sat 3 Jul 0%●●●●●●●●●●21:00
Sun 4 Jul 1%●●●●●●●●●●21:00
Mon 5 Jul 6%●●●●●●●●●●21:00
Tue 6 Jul 12%●●●●●●●●●●21:00
Wed 7 Jul 21%●●●●●●●●●●21:00
Thu 8 Jul 31%●●●●●●●●●●21:00
Fri 9 Jul 42%●●●●●●●●●●21:00
Sat 10 Jul 53%●●●●●●●●●●21:00
Sun 11 Jul 64%●●●●●●●●●●21:00
Mon 12 Jul 74%●●●●●●●●●●21:00
Tue 13 Jul 82%●●●●●●●●●●21:00
Wed 14 Jul 89%●●●●●●●●●●21:00
Thu 15 Jul 94%●●●●●●●●●●21:00
Fri 16 Jul 98%●●●●●●●●●●19:00
Sat 17 Jul 100%●●●●●●●●●●19:00
Sun 18 Jul 100%●●●●●●●●●●19:00
Mon 19 Jul 98%●●●●●●●●●●19:00
Tue 20 Jul 94%●●●●●●●●●●19:00
Wed 21 Jul 89%●●●●●●●●●●21:00
Thu 22 Jul 83%●●●●●●●●●●21:00
Fri 23 Jul 74%●●●●●●●●●●21:00
Sat 24 Jul 65%●●●●●●●●●●21:00
Sun 25 Jul 55%●●●●●●●●●●21:00
Mon 26 Jul 44%●●●●●●●●●●21:00
Tue 27 Jul 33%●●●●●●●●●●21:00
Wed 28 Jul 23%●●●●●●●●●●21:00
Thu 29 Jul 14%●●●●●●●●●●21:00
Fri 30 Jul 7%●●●●●●●●●●21:00
Sat 31 Jul 2%●●●●●●●●●●21:00

Check one night in detail Mosquito Bay tours

Questions

What are the best nights to see the bioluminescence at Mosquito Bay in July 2027?

The darkest nights are Thu 1 Jul, Fri 2 Jul, Sat 3 Jul, Sun 4 Jul, Mon 5 Jul, Tue 6 Jul, Sat 24 Jul, Sun 25 Jul, Mon 26 Jul, Tue 27 Jul and more. 16 of 31 nights score at least 4 out of 5.

Which nights should I avoid in July 2027?

Avoid the nights around the full moon on Sun 18 Jul, when moonlight washes out the glow.

19:00 or 21:00: which Mosquito Bay tour is darker in July?

19:00 is the darker choice on 0 nights; 21:00 is the darker choice on 19 nights.

Mosquito 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/Puerto_Rico).