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Tomales Bay in August 2027: darkest nights

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

8 pitch-dark nights, 15 dark nights

New moon Mon 2 Aug, Tue 31 Aug · Full moon Tue 17 Aug

Night by night, August 2027

NightMoon20:0021:30Best
Sun 1 Aug 0%●●●●●●●●●●21:30
Mon 2 Aug 1%●●●●●●●●●●21:30
Tue 3 Aug 5%●●●●●●●●●●21:30
Wed 4 Aug 11%●●●●●●●●●●21:30
Thu 5 Aug 20%●●●●●●●●●●21:30
Fri 6 Aug 29%●●●●●●●●●●21:30
Sat 7 Aug 40%●●●●●●●●●●21:30
Sun 8 Aug 50%●●●●●●●●●●21:30
Mon 9 Aug 61%●●●●●●●●●●21:30
Tue 10 Aug 70%●●●●●●●●●●21:30
Wed 11 Aug 79%●●●●●●●●●●21:30
Thu 12 Aug 86%●●●●●●●●●●21:30
Fri 13 Aug 92%●●●●●●●●●●21:30
Sat 14 Aug 96%●●●●●●●●●●21:30
Sun 15 Aug 99%●●●●●●●●●●21:30
Mon 16 Aug 100%●●●●●●●●●●21:30
Tue 17 Aug 99%●●●●●●●●●●21:30
Wed 18 Aug 96%●●●●●●●●●●21:30
Thu 19 Aug 92%●●●●●●●●●●21:30
Fri 20 Aug 86%●●●●●●●●●●21:30
Sat 21 Aug 78%●●●●●●●●●●21:30
Sun 22 Aug 68%●●●●●●●●●●21:30
Mon 23 Aug 58%●●●●●●●●●●21:30
Tue 24 Aug 47%●●●●●●●●●●21:30
Wed 25 Aug 35%●●●●●●●●●●21:30
Thu 26 Aug 25%●●●●●●●●●●21:30
Fri 27 Aug 15%●●●●●●●●●●21:30
Sat 28 Aug 8%●●●●●●●●●●21:30
Sun 29 Aug 3%●●●●●●●●●●21:30
Mon 30 Aug 0%●●●●●●●●●●21:30
Tue 31 Aug 1%●●●●●●●●●●21:30

Check one night in detail Tomales Bay tours

Questions

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

The darkest nights are Tue 24 Aug, Wed 25 Aug, Thu 26 Aug, Fri 27 Aug, Sat 28 Aug, Sun 29 Aug, Mon 30 Aug, Tue 31 Aug. 15 of 31 nights score at least 4 out of 5.

Which nights should I avoid in August 2027?

Avoid the nights around the full moon on Tue 17 Aug, when moonlight washes out the glow.

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

20:00 is the darker choice on 0 nights; 21:30 is the darker choice on 19 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).