tidealmanac
Sat, Oct 3

Sunday, October 4, 2026

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

Mon, Oct 5

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. Low12:52 AM-0.1 ft-0.02 m
  2. High8:30 AM4.7 ft1.42 m
  3. Low1:06 PM3.3 ft1.00 m
  4. High6:46 PM5.6 ft1.72 m

Range 5.7 ft1.74 m · 4 predicted tides · MLLW

Sun

Civil dawn
6:41 AM
Sunrise
7:08 AM
Solar noon
12:59 PM
Sunset
6:49 PM
Civil dusk
7:16 PM
Daylight
11h 42m

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

Moon

Last quarter43% illuminated · day 22 of the cycle

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

This week

Thu, Oct 1H 4:38AM 4.4 ft1.35 mL 8:54AM 3.1 ft0.95 mH 3:12PM 6.2 ft1.90 mL 10:22PM -0.2 ft-0.06 mFri, Oct 2H 6:01AM 4.3 ft1.32 mL 9:59AM 3.4 ft1.05 mH 4:12PM 6.0 ft1.83 mL 11:35PM -0.1 ft-0.03 mSat, Oct 3H 7:25AM 4.4 ft1.35 mL 11:30AM 3.5 ft1.08 mH 5:25PM 5.8 ft1.76 mSun, Oct 4L 12:52AM -0.1 ft-0.02 mH 8:30AM 4.7 ft1.42 mL 1:06PM 3.3 ft1.00 mH 6:46PM 5.6 ft1.72 mMon, Oct 5L 2:00AM -0.1 ft-0.03 mH 9:18AM 5.0 ft1.51 mL 2:21PM 2.8 ft0.84 mH 8:03PM 5.6 ft1.71 mTue, Oct 6L 2:56AM -0.1 ft-0.02 mH 9:58AM 5.3 ft1.60 mL 3:20PM 2.1 ft0.64 mH 9:12PM 5.6 ft1.70 mWed, Oct 7L 3:43AM 0.1 ft0.02 mH 10:33AM 5.5 ft1.69 mL 4:12PM 1.5 ft0.45 mH 10:13PM 5.5 ft1.69 m