La Parguera (Bahía Fosforescente) in May 2027: darkest nights
The only Puerto Rico bio bay where swimming is still allowed on some boat tours. Year-round.
17 pitch-dark nights, 18 dark nights
New moon Thu 6 May · Full moon Thu 20 May
Night by night, May 2027
| Night | Moon | 19:00 | 21:00 | Best |
|---|---|---|---|---|
| Sat 1 May | 20% | ●●●●● | ●●●●● | 21:00 |
| Sun 2 May | 13% | ●●●●● | ●●●●● | 21:00 |
| Mon 3 May | 7% | ●●●●● | ●●●●● | 21:00 |
| Tue 4 May | 2% | ●●●●● | ●●●●● | 21:00 |
| Wed 5 May | 0% | ●●●●● | ●●●●● | 21:00 |
| Thu 6 May | 1% | ●●●●● | ●●●●● | 21:00 |
| Fri 7 May | 4% | ●●●●● | ●●●●● | 21:00 |
| Sat 8 May | 9% | ●●●●● | ●●●●● | 21:00 |
| Sun 9 May | 17% | ●●●●● | ●●●●● | 21:00 |
| Mon 10 May | 26% | ●●●●● | ●●●●● | 21:00 |
| Tue 11 May | 38% | ●●●●● | ●●●●● | 21:00 |
| Wed 12 May | 49% | ●●●●● | ●●●●● | 21:00 |
| Thu 13 May | 61% | ●●●●● | ●●●●● | 21:00 |
| Fri 14 May | 72% | ●●●●● | ●●●●● | 21:00 |
| Sat 15 May | 81% | ●●●●● | ●●●●● | 21:00 |
| Sun 16 May | 89% | ●●●●● | ●●●●● | 21:00 |
| Mon 17 May | 95% | ●●●●● | ●●●●● | 21:00 |
| Tue 18 May | 98% | ●●●●● | ●●●●● | 19:00 |
| Wed 19 May | 100% | ●●●●● | ●●●●● | 19:00 |
| Thu 20 May | 99% | ●●●●● | ●●●●● | 19:00 |
| Fri 21 May | 97% | ●●●●● | ●●●●● | 19:00 |
| Sat 22 May | 93% | ●●●●● | ●●●●● | 21:00 |
| Sun 23 May | 87% | ●●●●● | ●●●●● | 21:00 |
| Mon 24 May | 80% | ●●●●● | ●●●●● | 21:00 |
| Tue 25 May | 72% | ●●●●● | ●●●●● | 21:00 |
| Wed 26 May | 63% | ●●●●● | ●●●●● | 21:00 |
| Thu 27 May | 54% | ●●●●● | ●●●●● | 21:00 |
| Fri 28 May | 44% | ●●●●● | ●●●●● | 21:00 |
| Sat 29 May | 34% | ●●●●● | ●●●●● | 21:00 |
| Sun 30 May | 25% | ●●●●● | ●●●●● | 21:00 |
| Mon 31 May | 16% | ●●●●● | ●●●●● | 21:00 |
Check one night in detail La Parguera (Bahía Fosforescente) tours
Questions
What are the best nights to see the bioluminescence at La Parguera (Bahía Fosforescente) 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, Sun 9 May, Mon 24 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.
19:00 or 21:00: which La Parguera (Bahía Fosforescente) tour is darker in May?
19:00 is the darker choice on 0 nights; 21:00 is the darker choice on 20 nights.
La Parguera (Bahía Fosforescente) 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).