Mosquito Bay in December 2026: 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.
19 pitch-dark nights, 20 dark nights
New moon Tue 8 Dec · Full moon Wed 23 Dec
Night by night, December 2026
| Night | Moon | 19:00 | 21:00 | Best |
|---|---|---|---|---|
| Tue 1 Dec | 41% | ●●●●● | ●●●●● | 21:00 |
| Wed 2 Dec | 31% | ●●●●● | ●●●●● | 21:00 |
| Thu 3 Dec | 21% | ●●●●● | ●●●●● | 21:00 |
| Fri 4 Dec | 13% | ●●●●● | ●●●●● | 21:00 |
| Sat 5 Dec | 7% | ●●●●● | ●●●●● | 21:00 |
| Sun 6 Dec | 3% | ●●●●● | ●●●●● | 21:00 |
| Mon 7 Dec | 1% | ●●●●● | ●●●●● | 21:00 |
| Tue 8 Dec | 0% | ●●●●● | ●●●●● | 21:00 |
| Wed 9 Dec | 1% | ●●●●● | ●●●●● | 21:00 |
| Thu 10 Dec | 4% | ●●●●● | ●●●●● | 21:00 |
| Fri 11 Dec | 9% | ●●●●● | ●●●●● | 21:00 |
| Sat 12 Dec | 15% | ●●●●● | ●●●●● | 21:00 |
| Sun 13 Dec | 22% | ●●●●● | ●●●●● | 21:00 |
| Mon 14 Dec | 31% | ●●●●● | ●●●●● | 21:00 |
| Tue 15 Dec | 41% | ●●●●● | ●●●●● | 21:00 |
| Wed 16 Dec | 51% | ●●●●● | ●●●●● | 21:00 |
| Thu 17 Dec | 61% | ●●●●● | ●●●●● | 21:00 |
| Fri 18 Dec | 72% | ●●●●● | ●●●●● | 21:00 |
| Sat 19 Dec | 81% | ●●●●● | ●●●●● | 21:00 |
| Sun 20 Dec | 89% | ●●●●● | ●●●●● | 21:00 |
| Mon 21 Dec | 95% | ●●●●● | ●●●●● | 21:00 |
| Tue 22 Dec | 99% | ●●●●● | ●●●●● | 19:00 |
| Wed 23 Dec | 100% | ●●●●● | ●●●●● | 19:00 |
| Thu 24 Dec | 98% | ●●●●● | ●●●●● | 19:00 |
| Fri 25 Dec | 94% | ●●●●● | ●●●●● | 19:00 |
| Sat 26 Dec | 87% | ●●●●● | ●●●●● | 19:00 |
| Sun 27 Dec | 79% | ●●●●● | ●●●●● | 19:00 |
| Mon 28 Dec | 69% | ●●●●● | ●●●●● | 21:00 |
| Tue 29 Dec | 58% | ●●●●● | ●●●●● | 21:00 |
| Wed 30 Dec | 47% | ●●●●● | ●●●●● | 21:00 |
| Thu 31 Dec | 37% | ●●●●● | ●●●●● | 21:00 |
Check one night in detail Mosquito Bay tours
Questions
What are the best nights to see the bioluminescence at Mosquito Bay 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. 20 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.
19:00 or 21:00: which Mosquito Bay tour is darker in December?
19:00 is the darker choice on 3 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).