tidealmanac
Thu, Oct 29

Friday, October 30, 2026

Alcatraz Island, CA · NOAA 9414792 · MLLW · Local time (America/Los_Angeles)

Sat, Oct 31

This is a subordinate station: NOAA predicts its highs and lows from a nearby reference station and publishes no curve for it. Nothing is interpolated.

Tides

  1. High4:41 AM4.6 ft1.42 m
  2. Low8:50 AM3.4 ft1.03 m
  3. High2:53 PM6.2 ft1.90 m
  4. Low10:07 PM-0.7 ft-0.22 m

Range 7.0 ft2.13 m · 4 predicted tides · MLLW

Sun

Civil dawn
7:06 AM
Sunrise
7:33 AM
Solar noon
12:53 PM
Sunset
6:14 PM
Civil dusk
6:41 PM
Daylight
10h 41m

Computed from the station's coordinates (NOAA solar algorithm, ±1 min); not NOAA tide data. Sun calendars: sunupsundown.site.

Moon

Waning gibbous79% illuminated · day 19 of the cycle

Between spring and neap: an average tidal range. Approximate phase, computed here.

This week

Tue, Oct 27H 1:35AM 5.0 ft1.51 mL 6:19AM 2.5 ft0.76 mH 12:29PM 6.6 ft2.03 mL 7:20PM -1.0 ft-0.32 mWed, Oct 28H 2:33AM 4.9 ft1.48 mL 7:02AM 2.9 ft0.87 mH 1:10PM 6.7 ft2.03 mL 8:10PM -1.1 ft-0.34 mThu, Oct 29H 3:35AM 4.7 ft1.45 mL 7:50AM 3.2 ft0.97 mH 1:57PM 6.5 ft1.99 mL 9:05PM -1.0 ft-0.30 mFri, Oct 30H 4:41AM 4.6 ft1.42 mL 8:50AM 3.4 ft1.03 mH 2:53PM 6.2 ft1.90 mL 10:07PM -0.7 ft-0.22 mSat, Oct 31H 5:49AM 4.7 ft1.42 mL 10:08AM 3.4 ft1.05 mH 3:58PM 5.8 ft1.78 mL 11:14PM -0.4 ft-0.13 mSun, Nov 1H 5:54AM 4.8 ft1.46 mL 10:42AM 3.2 ft0.99 mH 4:13PM 5.4 ft1.65 mL 11:22PM -0.1 ft-0.04 mMon, Nov 2H 6:49AM 5.0 ft1.53 mL 12:09PM 2.7 ft0.84 mH 5:35PM 5.0 ft1.54 m