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Tomales Bay in October 2027: darkest nights

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

16 pitch-dark nights, 18 dark nights

New moon Fri 29 Oct · Full moon Fri 15 Oct

Night by night, October 2027

NightMoon20:0021:30Best
Fri 1 Oct 7%●●●●●●●●●●21:30
Sat 2 Oct 13%●●●●●●●●●●21:30
Sun 3 Oct 21%●●●●●●●●●●21:30
Mon 4 Oct 29%●●●●●●●●●●21:30
Tue 5 Oct 39%●●●●●●●●●●21:30
Wed 6 Oct 48%●●●●●●●●●●21:30
Thu 7 Oct 58%●●●●●●●●●●21:30
Fri 8 Oct 67%●●●●●●●●●●21:30
Sat 9 Oct 75%●●●●●●●●●●21:30
Sun 10 Oct 83%●●●●●●●●●●21:30
Mon 11 Oct 89%●●●●●●●●●●21:30
Tue 12 Oct 94%●●●●●●●●●●21:30
Wed 13 Oct 98%●●●●●●●●●●20:00
Thu 14 Oct 100%●●●●●●●●●●20:00
Fri 15 Oct 99%●●●●●●●●●●20:00
Sat 16 Oct 97%●●●●●●●●●●20:00
Sun 17 Oct 92%●●●●●●●●●●20:00
Mon 18 Oct 85%●●●●●●●●●●20:00
Tue 19 Oct 77%●●●●●●●●●●20:00
Wed 20 Oct 66%●●●●●●●●●●20:00
Thu 21 Oct 55%●●●●●●●●●●20:00
Fri 22 Oct 43%●●●●●●●●●●20:00
Sat 23 Oct 31%●●●●●●●●●●20:00
Sun 24 Oct 21%●●●●●●●●●●20:00
Mon 25 Oct 12%●●●●●●●●●●20:00
Tue 26 Oct 6%●●●●●●●●●●20:00
Wed 27 Oct 2%●●●●●●●●●●20:00
Thu 28 Oct 0%●●●●●●●●●●20:00
Fri 29 Oct 1%●●●●●●●●●●20:00
Sat 30 Oct 4%●●●●●●●●●●20:00
Sun 31 Oct 9%●●●●●●●●●●20:00

Check one night in detail Tomales Bay tours

Questions

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

The darkest nights are Fri 1 Oct, Sat 2 Oct, Sun 3 Oct, Mon 4 Oct, Wed 20 Oct, Thu 21 Oct, Fri 22 Oct, Sat 23 Oct, Sun 24 Oct, Mon 25 Oct and more. 18 of 31 nights score at least 4 out of 5.

Which nights should I avoid in October 2027?

Avoid the nights around the full moon on Fri 15 Oct, when moonlight washes out the glow.

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

20:00 is the darker choice on 14 nights; 21:30 is the darker choice on 6 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).