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Indian River Lagoon at Merritt Island in May 2027: darkest nights

Kayak tours from Haulover Canal. Manatees and dolphins light up the water as they move. Dinoflagellates June to September; comb jellies glow in winter.

16 pitch-dark nights, 19 dark nights

New moon Thu 6 May · Full moon Thu 20 May

Night by night, May 2027

NightMoon20:3021:30Best
Sat 1 May 20%●●●●●●●●●●21:30
Sun 2 May 13%●●●●●●●●●●21:30
Mon 3 May 7%●●●●●●●●●●21:30
Tue 4 May 2%●●●●●●●●●●21:30
Wed 5 May 0%●●●●●●●●●●21:30
Thu 6 May 1%●●●●●●●●●●21:30
Fri 7 May 4%●●●●●●●●●●21:30
Sat 8 May 9%●●●●●●●●●●21:30
Sun 9 May 17%●●●●●●●●●●21:30
Mon 10 May 26%●●●●●●●●●●21:30
Tue 11 May 38%●●●●●●●●●●21:30
Wed 12 May 49%●●●●●●●●●●21:30
Thu 13 May 61%●●●●●●●●●●21:30
Fri 14 May 72%●●●●●●●●●●21:30
Sat 15 May 81%●●●●●●●●●●21:30
Sun 16 May 89%●●●●●●●●●●21:30
Mon 17 May 95%●●●●●●●●●●21:30
Tue 18 May 98%●●●●●●●●●●20:30
Wed 19 May 100%●●●●●●●●●●21:30
Thu 20 May 99%●●●●●●●●●●21:30
Fri 21 May 97%●●●●●●●●●●21:30
Sat 22 May 93%●●●●●●●●●●21:30
Sun 23 May 87%●●●●●●●●●●21:30
Mon 24 May 80%●●●●●●●●●●21:30
Tue 25 May 72%●●●●●●●●●●21:30
Wed 26 May 63%●●●●●●●●●●21:30
Thu 27 May 54%●●●●●●●●●●21:30
Fri 28 May 44%●●●●●●●●●●21:30
Sat 29 May 34%●●●●●●●●●●21:30
Sun 30 May 25%●●●●●●●●●●21:30
Mon 31 May 16%●●●●●●●●●●21:30

Check one night in detail Indian River Lagoon at Merritt Island tours

Questions

What are the best nights to see the bioluminescence at Indian River Lagoon at Merritt Island 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, Sun 23 May, Mon 24 May, Tue 25 May and more. 19 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.

20:30 or 21:30: which Indian River Lagoon at Merritt Island tour is darker in May?

20:30 is the darker choice on 0 nights; 21:30 is the darker choice on 20 nights.

Indian River Lagoon at Merritt Island 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/New_York).