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Tomales Bay in April 2027: darkest nights

Night kayak tours from Marshall and Inverness. Fog helps; moonlight hurts. Late summer to early autumn.

17 pitch-dark nights, 19 dark nights

New moon Tue 6 Apr · Full moon Tue 20 Apr

Night by night, April 2027

NightMoon20:0021:30Best
Thu 1 Apr 21%●●●●●●●●●●21:30
Fri 2 Apr 14%●●●●●●●●●●21:30
Sat 3 Apr 8%●●●●●●●●●●21:30
Sun 4 Apr 3%●●●●●●●●●●21:30
Mon 5 Apr 1%●●●●●●●●●●21:30
Tue 6 Apr 0%●●●●●●●●●●21:30
Wed 7 Apr 2%●●●●●●●●●●21:30
Thu 8 Apr 6%●●●●●●●●●●21:30
Fri 9 Apr 13%●●●●●●●●●●21:30
Sat 10 Apr 21%●●●●●●●●●●21:30
Sun 11 Apr 31%●●●●●●●●●●21:30
Mon 12 Apr 43%●●●●●●●●●●21:30
Tue 13 Apr 55%●●●●●●●●●●21:30
Wed 14 Apr 66%●●●●●●●●●●21:30
Thu 15 Apr 77%●●●●●●●●●●21:30
Fri 16 Apr 86%●●●●●●●●●●21:30
Sat 17 Apr 93%●●●●●●●●●●21:30
Sun 18 Apr 97%●●●●●●●●●●20:00
Mon 19 Apr 100%●●●●●●●●●●20:00
Tue 20 Apr 100%●●●●●●●●●●21:30
Wed 21 Apr 97%●●●●●●●●●●21:30
Thu 22 Apr 93%●●●●●●●●●●21:30
Fri 23 Apr 88%●●●●●●●●●●21:30
Sat 24 Apr 81%●●●●●●●●●●21:30
Sun 25 Apr 73%●●●●●●●●●●21:30
Mon 26 Apr 64%●●●●●●●●●●21:30
Tue 27 Apr 55%●●●●●●●●●●21:30
Wed 28 Apr 45%●●●●●●●●●●21:30
Thu 29 Apr 36%●●●●●●●●●●21:30
Fri 30 Apr 27%●●●●●●●●●●21:30

Check one night in detail Tomales Bay tours

Questions

What are the best nights to see the bioluminescence at Tomales Bay in April 2027?

The darkest nights are Thu 1 Apr, Fri 2 Apr, Sat 3 Apr, Sun 4 Apr, Mon 5 Apr, Tue 6 Apr, Wed 7 Apr, Thu 8 Apr, Fri 9 Apr, Fri 23 Apr and more. 19 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 Tue 20 Apr, when moonlight washes out the glow.

20:00 or 21:30: which Tomales Bay tour is darker in April?

20:00 is the darker choice on 0 nights; 21:30 is the darker choice on 20 nights.

Tomales 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/Los_Angeles).