Toyama Bay firefly squid in April 2027: darkest nights
Firefly squid (hotaru-ika) glow as fishermen haul nets before dawn. Sightseeing boats leave around 3 am. March to May only.
4 pitch-dark nights, 7 dark nights
New moon Wed 7 Apr · Full moon Wed 21 Apr
Night by night, April 2027
| Night | Moon | 03:00 | Best |
|---|---|---|---|
| Thu 1 Apr | 27% | ●●●●● | 03:00 |
| Fri 2 Apr | 19% | ●●●●● | 03:00 |
| Sat 3 Apr | 12% | ●●●●● | 03:00 |
| Sun 4 Apr | 6% | ●●●●● | 03:00 |
| Mon 5 Apr | 2% | ●●●●● | 03:00 |
| Tue 6 Apr | 0% | ●●●●● | 03:00 |
| Wed 7 Apr | 1% | ●●●●● | 03:00 |
| Thu 8 Apr | 3% | ●●●●● | 03:00 |
| Fri 9 Apr | 8% | ●●●●● | 03:00 |
| Sat 10 Apr | 15% | ●●●●● | 03:00 |
| Sun 11 Apr | 24% | ●●●●● | 03:00 |
| Mon 12 Apr | 35% | ●●●●● | 03:00 |
| Tue 13 Apr | 47% | ●●●●● | 03:00 |
| Wed 14 Apr | 59% | ●●●●● | 03:00 |
| Thu 15 Apr | 70% | ●●●●● | 03:00 |
| Fri 16 Apr | 80% | ●●●●● | 03:00 |
| Sat 17 Apr | 88% | ●●●●● | 03:00 |
| Sun 18 Apr | 95% | ●●●●● | 03:00 |
| Mon 19 Apr | 98% | ●●●●● | 03:00 |
| Tue 20 Apr | 100% | ●●●●● | 03:00 |
| Wed 21 Apr | 99% | ●●●●● | 03:00 |
| Thu 22 Apr | 96% | ●●●●● | 03:00 |
| Fri 23 Apr | 92% | ●●●●● | 03:00 |
| Sat 24 Apr | 85% | ●●●●● | 03:00 |
| Sun 25 Apr | 78% | ●●●●● | 03:00 |
| Mon 26 Apr | 70% | ●●●●● | 03:00 |
| Tue 27 Apr | 61% | ●●●●● | 03:00 |
| Wed 28 Apr | 52% | ●●●●● | 03:00 |
| Thu 29 Apr | 42% | ●●●●● | 03:00 |
| Fri 30 Apr | 33% | ●●●●● | 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 April 2027?
The darkest nights are Sat 3 Apr, Sun 4 Apr, Mon 5 Apr, Tue 6 Apr. 7 of 30 nights score at least 4 out of 5.
Which nights should I avoid in April 2027?
Avoid the nights around the full moon on Wed 21 Apr, 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).