Toyama Bay firefly squid in September 2027: darkest nights
Firefly squid (hotaru-ika) glow as fishermen haul nets before dawn. Sightseeing boats leave around 3 am. March to May only.
7 pitch-dark nights, 10 dark nights
New moon Thu 30 Sep · Full moon Thu 16 Sep
Night by night, September 2027
| Night | Moon | 03:00 | Best |
|---|---|---|---|
| Wed 1 Sep | 1% | ●●●●● | 03:00 |
| Thu 2 Sep | 5% | ●●●●● | 03:00 |
| Fri 3 Sep | 11% | ●●●●● | 03:00 |
| Sat 4 Sep | 19% | ●●●●● | 03:00 |
| Sun 5 Sep | 28% | ●●●●● | 03:00 |
| Mon 6 Sep | 38% | ●●●●● | 03:00 |
| Tue 7 Sep | 48% | ●●●●● | 03:00 |
| Wed 8 Sep | 58% | ●●●●● | 03:00 |
| Thu 9 Sep | 68% | ●●●●● | 03:00 |
| Fri 10 Sep | 76% | ●●●●● | 03:00 |
| Sat 11 Sep | 84% | ●●●●● | 03:00 |
| Sun 12 Sep | 90% | ●●●●● | 03:00 |
| Mon 13 Sep | 95% | ●●●●● | 03:00 |
| Tue 14 Sep | 98% | ●●●●● | 03:00 |
| Wed 15 Sep | 100% | ●●●●● | 03:00 |
| Thu 16 Sep | 100% | ●●●●● | 03:00 |
| Fri 17 Sep | 97% | ●●●●● | 03:00 |
| Sat 18 Sep | 93% | ●●●●● | 03:00 |
| Sun 19 Sep | 87% | ●●●●● | 03:00 |
| Mon 20 Sep | 79% | ●●●●● | 03:00 |
| Tue 21 Sep | 69% | ●●●●● | 03:00 |
| Wed 22 Sep | 58% | ●●●●● | 03:00 |
| Thu 23 Sep | 47% | ●●●●● | 03:00 |
| Fri 24 Sep | 35% | ●●●●● | 03:00 |
| Sat 25 Sep | 24% | ●●●●● | 03:00 |
| Sun 26 Sep | 15% | ●●●●● | 03:00 |
| Mon 27 Sep | 8% | ●●●●● | 03:00 |
| Tue 28 Sep | 3% | ●●●●● | 03:00 |
| Wed 29 Sep | 0% | ●●●●● | 03:00 |
| Thu 30 Sep | 1% | ●●●●● | 03:00 |
Check one night in detail Toyama Bay firefly squid tours
Questions
What are the best nights to see the bioluminescence at Toyama Bay firefly squid in September 2027?
The darkest nights are Fri 10 Sep, Sat 11 Sep, Sun 12 Sep, Mon 27 Sep, Tue 28 Sep, Wed 29 Sep, Thu 30 Sep. 10 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 Thu 16 Sep, when moonlight washes out the glow.
Toyama Bay firefly squid darkness by month
Darkness score 1-5 per tour slot from twilight and moonlight. Weather and plankton health are not included. Times are local (Asia/Tokyo).