tidealmanac
Thu, Oct 15

Friday, October 16, 2026

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

Sat, Oct 17

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. High5:46 AM4.2 ft1.29 m
  2. Low9:46 AM3.7 ft1.12 m
  3. High3:25 PM5.2 ft1.59 m
  4. Low10:50 PM0.5 ft0.16 m

Range 4.7 ft1.43 m · 4 predicted tides · MLLW

Sun

Civil dawn
6:52 AM
Sunrise
7:19 AM
Solar noon
12:55 PM
Sunset
6:32 PM
Civil dusk
6:58 PM
Daylight
11h 13m

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

Moon

Waxing crescent28% illuminated · day 5 of the cycle

Near quarter moon: neap tides, a smaller range than average. Approximate phase, computed here.

This week

Tue, 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 mMon, Oct 19L 1:00AM 0.7 ft0.20 mH 8:41AM 4.5 ft1.38 mL 1:49PM 3.2 ft0.96 mH 6:49PM 4.7 ft1.42 m