Mosquito Bay in September 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, 15 dark nights
New moon Wed 29 Sep · Full moon Wed 15 Sep
Night by night, September 2027
| Night | Moon | 19:00 | 21:00 | Best |
|---|---|---|---|---|
| Wed 1 Sep | 3% | ●●●●● | ●●●●● | 21:00 |
| Thu 2 Sep | 8% | ●●●●● | ●●●●● | 21:00 |
| Fri 3 Sep | 15% | ●●●●● | ●●●●● | 21:00 |
| Sat 4 Sep | 24% | ●●●●● | ●●●●● | 21:00 |
| Sun 5 Sep | 33% | ●●●●● | ●●●●● | 21:00 |
| Mon 6 Sep | 43% | ●●●●● | ●●●●● | 21:00 |
| Tue 7 Sep | 53% | ●●●●● | ●●●●● | 21:00 |
| Wed 8 Sep | 63% | ●●●●● | ●●●●● | 21:00 |
| Thu 9 Sep | 72% | ●●●●● | ●●●●● | 21:00 |
| Fri 10 Sep | 80% | ●●●●● | ●●●●● | 21:00 |
| Sat 11 Sep | 87% | ●●●●● | ●●●●● | 21:00 |
| Sun 12 Sep | 93% | ●●●●● | ●●●●● | 21:00 |
| Mon 13 Sep | 97% | ●●●●● | ●●●●● | 21:00 |
| Tue 14 Sep | 99% | ●●●●● | ●●●●● | 19:00 |
| Wed 15 Sep | 100% | ●●●●● | ●●●●● | 19:00 |
| Thu 16 Sep | 99% | ●●●●● | ●●●●● | 19:00 |
| Fri 17 Sep | 95% | ●●●●● | ●●●●● | 19:00 |
| Sat 18 Sep | 90% | ●●●●● | ●●●●● | 19:00 |
| Sun 19 Sep | 83% | ●●●●● | ●●●●● | 19:00 |
| Mon 20 Sep | 74% | ●●●●● | ●●●●● | 19:00 |
| Tue 21 Sep | 64% | ●●●●● | ●●●●● | 21:00 |
| Wed 22 Sep | 52% | ●●●●● | ●●●●● | 21:00 |
| Thu 23 Sep | 41% | ●●●●● | ●●●●● | 21:00 |
| Fri 24 Sep | 30% | ●●●●● | ●●●●● | 21:00 |
| Sat 25 Sep | 19% | ●●●●● | ●●●●● | 21:00 |
| Sun 26 Sep | 11% | ●●●●● | ●●●●● | 21:00 |
| Mon 27 Sep | 5% | ●●●●● | ●●●●● | 21:00 |
| Tue 28 Sep | 1% | ●●●●● | ●●●●● | 21:00 |
| Wed 29 Sep | 0% | ●●●●● | ●●●●● | 21:00 |
| Thu 30 Sep | 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 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. 15 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.
19:00 or 21:00: which Mosquito Bay tour is darker in September?
19:00 is the darker choice on 2 nights; 21:00 is the darker choice on 16 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).