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Tomales Bay in July 2027: darkest nights

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

0 pitch-dark nights, 2 dark nights

New moon Sat 3 Jul · Full moon Sun 18 Jul

Night by night, July 2027

NightMoon20:0021:30Best
Thu 1 Jul 5%●●●●●●●●●●21:30
Fri 2 Jul 1%●●●●●●●●●●21:30
Sat 3 Jul 0%●●●●●●●●●●21:30
Sun 4 Jul 2%●●●●●●●●●●21:30
Mon 5 Jul 6%●●●●●●●●●●21:30
Tue 6 Jul 14%●●●●●●●●●●21:30
Wed 7 Jul 23%●●●●●●●●●●21:30
Thu 8 Jul 33%●●●●●●●●●●21:30
Fri 9 Jul 44%●●●●●●●●●●21:30
Sat 10 Jul 55%●●●●●●●●●●21:30
Sun 11 Jul 66%●●●●●●●●●●21:30
Mon 12 Jul 75%●●●●●●●●●●21:30
Tue 13 Jul 83%●●●●●●●●●●21:30
Wed 14 Jul 90%●●●●●●●●●●21:30
Thu 15 Jul 95%●●●●●●●●●●21:30
Fri 16 Jul 98%●●●●●●●●●●21:30
Sat 17 Jul 100%●●●●●●●●●●21:30
Sun 18 Jul 100%●●●●●●●●●●21:30
Mon 19 Jul 98%●●●●●●●●●●21:30
Tue 20 Jul 94%●●●●●●●●●●21:30
Wed 21 Jul 88%●●●●●●●●●●21:30
Thu 22 Jul 81%●●●●●●●●●●21:30
Fri 23 Jul 73%●●●●●●●●●●21:30
Sat 24 Jul 63%●●●●●●●●●●21:30
Sun 25 Jul 53%●●●●●●●●●●21:30
Mon 26 Jul 42%●●●●●●●●●●21:30
Tue 27 Jul 32%●●●●●●●●●●21:30
Wed 28 Jul 22%●●●●●●●●●●21:30
Thu 29 Jul 13%●●●●●●●●●●21:30
Fri 30 Jul 6%●●●●●●●●●●21:30
Sat 31 Jul 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 July 2027?

2 of 31 nights score at least 4 out of 5 for darkness.

Which nights should I avoid in July 2027?

Avoid the nights around the full moon on Sun 18 Jul, when moonlight washes out the glow.

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

20:00 is the darker choice on 0 nights; 21:30 is the darker choice on 18 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).