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Tomales Bay in March 2027: darkest nights

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

18 pitch-dark nights, 20 dark nights

New moon Mon 8 Mar · Full moon Mon 22 Mar

Night by night, March 2027

NightMoon20:0021:30Best
Mon 1 Mar 31%●●●●●●●●●●20:00
Tue 2 Mar 23%●●●●●●●●●●20:00
Wed 3 Mar 15%●●●●●●●●●●20:00
Thu 4 Mar 9%●●●●●●●●●●20:00
Fri 5 Mar 4%●●●●●●●●●●20:00
Sat 6 Mar 1%●●●●●●●●●●20:00
Sun 7 Mar 0%●●●●●●●●●●20:00
Mon 8 Mar 1%●●●●●●●●●●20:00
Tue 9 Mar 4%●●●●●●●●●●20:00
Wed 10 Mar 9%●●●●●●●●●●21:30
Thu 11 Mar 16%●●●●●●●●●●21:30
Fri 12 Mar 25%●●●●●●●●●●21:30
Sat 13 Mar 35%●●●●●●●●●●21:30
Sun 14 Mar 46%●●●●●●●●●●21:30
Mon 15 Mar 58%●●●●●●●●●●21:30
Tue 16 Mar 70%●●●●●●●●●●21:30
Wed 17 Mar 80%●●●●●●●●●●21:30
Thu 18 Mar 88%●●●●●●●●●●21:30
Fri 19 Mar 95%●●●●●●●●●●21:30
Sat 20 Mar 99%●●●●●●●●●●20:00
Sun 21 Mar 100%●●●●●●●●●●20:00
Mon 22 Mar 99%●●●●●●●●●●20:00
Tue 23 Mar 95%●●●●●●●●●●20:00
Wed 24 Mar 90%●●●●●●●●●●21:30
Thu 25 Mar 83%●●●●●●●●●●21:30
Fri 26 Mar 75%●●●●●●●●●●21:30
Sat 27 Mar 67%●●●●●●●●●●21:30
Sun 28 Mar 57%●●●●●●●●●●21:30
Mon 29 Mar 48%●●●●●●●●●●21:30
Tue 30 Mar 39%●●●●●●●●●●21:30
Wed 31 Mar 30%●●●●●●●●●●21:30

Check one night in detail Tomales Bay tours

Questions

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

The darkest nights are Mon 1 Mar, Tue 2 Mar, Wed 3 Mar, Thu 4 Mar, Fri 5 Mar, Sat 6 Mar, Sun 7 Mar, Mon 8 Mar, Tue 9 Mar, Wed 10 Mar and more. 20 of 31 nights score at least 4 out of 5.

Which nights should I avoid in March 2027?

Avoid the nights around the full moon on Mon 22 Mar, when moonlight washes out the glow.

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

20:00 is the darker choice on 10 nights; 21:30 is the darker choice on 12 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).