tidealmanac
Wed, Oct 14

Thursday, October 15, 2026

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

Fri, Oct 16

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. High4:35 AM4.3 ft1.32 m
  2. Low8:47 AM3.5 ft1.05 m
  3. High2:38 PM5.5 ft1.67 m
  4. Low9:52 PM0.3 ft0.10 m

Range 5.2 ft1.57 m · 4 predicted tides · MLLW

Sun

Civil dawn
6:51 AM
Sunrise
7:18 AM
Solar noon
12:56 PM
Sunset
6:33 PM
Civil dusk
7:00 PM
Daylight
11h 16m

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

Moon

Waxing crescent19% illuminated · day 4 of the cycle

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

This week

Mon, Oct 12H 1:46AM 4.9 ft1.49 mL 6:48AM 2.3 ft0.69 mH 1:00PM 6.0 ft1.84 mL 7:39PM -0.1 ft-0.04 mTue, Oct 13H 2:38AM 4.7 ft1.43 mL 7:24AM 2.7 ft0.83 mH 1:28PM 5.9 ft1.80 mL 8:19PM 0.0 ft-0.01 mWed, Oct 14H 3:33AM 4.5 ft1.37 mL 8:02AM 3.1 ft0.96 mH 2:00PM 5.7 ft1.74 mL 9:03PM 0.1 ft0.03 mThu, Oct 15H 4:35AM 4.3 ft1.32 mL 8:47AM 3.5 ft1.05 mH 2:38PM 5.5 ft1.67 mL 9:52PM 0.3 ft0.10 mFri, Oct 16H 5:46AM 4.2 ft1.29 mL 9:46AM 3.7 ft1.12 mH 3:25PM 5.2 ft1.59 mL 10:50PM 0.5 ft0.16 mSat, Oct 17H 7:02AM 4.2 ft1.29 mL 11:14AM 3.7 ft1.13 mH 4:24PM 5.0 ft1.51 mL 11:56PM 0.6 ft0.19 mSun, Oct 18H 8:01AM 4.4 ft1.33 mL 12:43PM 3.5 ft1.08 mH 5:35PM 4.8 ft1.45 m