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Tomales Bay in January 2027: darkest nights

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

19 pitch-dark nights, 19 dark nights

New moon Thu 7 Jan · Full moon Fri 22 Jan

Night by night, January 2027

NightMoon20:0021:30Best
Fri 1 Jan 26%●●●●●●●●●●20:00
Sat 2 Jan 18%●●●●●●●●●●20:00
Sun 3 Jan 11%●●●●●●●●●●20:00
Mon 4 Jan 6%●●●●●●●●●●20:00
Tue 5 Jan 2%●●●●●●●●●●20:00
Wed 6 Jan 0%●●●●●●●●●●20:00
Thu 7 Jan 0%●●●●●●●●●●20:00
Fri 8 Jan 2%●●●●●●●●●●20:00
Sat 9 Jan 5%●●●●●●●●●●20:00
Sun 10 Jan 11%●●●●●●●●●●21:30
Mon 11 Jan 17%●●●●●●●●●●21:30
Tue 12 Jan 26%●●●●●●●●●●21:30
Wed 13 Jan 35%●●●●●●●●●●21:30
Thu 14 Jan 46%●●●●●●●●●●21:30
Fri 15 Jan 57%●●●●●●●●●●21:30
Sat 16 Jan 68%●●●●●●●●●●20:00
Sun 17 Jan 78%●●●●●●●●●●20:00
Mon 18 Jan 87%●●●●●●●●●●20:00
Tue 19 Jan 94%●●●●●●●●●●20:00
Wed 20 Jan 98%●●●●●●●●●●20:00
Thu 21 Jan 100%●●●●●●●●●●20:00
Fri 22 Jan 99%●●●●●●●●●●20:00
Sat 23 Jan 95%●●●●●●●●●●20:00
Sun 24 Jan 89%●●●●●●●●●●20:00
Mon 25 Jan 82%●●●●●●●●●●20:00
Tue 26 Jan 72%●●●●●●●●●●20:00
Wed 27 Jan 62%●●●●●●●●●●20:00
Thu 28 Jan 52%●●●●●●●●●●20:00
Fri 29 Jan 42%●●●●●●●●●●20:00
Sat 30 Jan 33%●●●●●●●●●●20:00
Sun 31 Jan 24%●●●●●●●●●●20:00

Check one night in detail Tomales Bay tours

Questions

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

The darkest nights are Fri 1 Jan, Sat 2 Jan, Sun 3 Jan, Mon 4 Jan, Tue 5 Jan, Wed 6 Jan, Thu 7 Jan, Fri 8 Jan, Sat 9 Jan, Sun 10 Jan and more. 19 of 31 nights score at least 4 out of 5.

Which nights should I avoid in January 2027?

Avoid the nights around the full moon on Fri 22 Jan, when moonlight washes out the glow.

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

20:00 is the darker choice on 17 nights; 21:30 is the darker choice on 4 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).