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Tomales Bay in September 2027: darkest nights

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

13 pitch-dark nights, 16 dark nights

New moon Wed 29 Sep · Full moon Wed 15 Sep

Night by night, September 2027

NightMoon20:0021:30Best
Wed 1 Sep 4%●●●●●●●●●●21:30
Thu 2 Sep 9%●●●●●●●●●●21:30
Fri 3 Sep 16%●●●●●●●●●●21:30
Sat 4 Sep 25%●●●●●●●●●●21:30
Sun 5 Sep 34%●●●●●●●●●●21:30
Mon 6 Sep 44%●●●●●●●●●●21:30
Tue 7 Sep 54%●●●●●●●●●●21:30
Wed 8 Sep 64%●●●●●●●●●●21:30
Thu 9 Sep 73%●●●●●●●●●●21:30
Fri 10 Sep 81%●●●●●●●●●●21:30
Sat 11 Sep 88%●●●●●●●●●●20:00
Sun 12 Sep 93%●●●●●●●●●●20:00
Mon 13 Sep 97%●●●●●●●●●●20:00
Tue 14 Sep 99%●●●●●●●●●●20:00
Wed 15 Sep 100%●●●●●●●●●●20:00
Thu 16 Sep 98%●●●●●●●●●●20:00
Fri 17 Sep 95%●●●●●●●●●●20:00
Sat 18 Sep 89%●●●●●●●●●●20:00
Sun 19 Sep 82%●●●●●●●●●●20:00
Mon 20 Sep 73%●●●●●●●●●●20:00
Tue 21 Sep 62%●●●●●●●●●●21:30
Wed 22 Sep 51%●●●●●●●●●●21:30
Thu 23 Sep 39%●●●●●●●●●●21:30
Fri 24 Sep 28%●●●●●●●●●●21:30
Sat 25 Sep 18%●●●●●●●●●●21:30
Sun 26 Sep 10%●●●●●●●●●●21:30
Mon 27 Sep 4%●●●●●●●●●●21:30
Tue 28 Sep 1%●●●●●●●●●●21:30
Wed 29 Sep 0%●●●●●●●●●●21:30
Thu 30 Sep 2%●●●●●●●●●●21:30

Check one night in detail Tomales Bay tours

Questions

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

The darkest nights are Wed 1 Sep, Thu 2 Sep, Fri 3 Sep, Sat 4 Sep, Wed 22 Sep, Thu 23 Sep, Fri 24 Sep, Sat 25 Sep, Sun 26 Sep, Mon 27 Sep and more. 16 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 Wed 15 Sep, when moonlight washes out the glow.

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

20:00 is the darker choice on 1 nights; 21:30 is the darker choice on 17 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).