Tides Today & Tomorrow in Alcatraz Island, CA

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently falling in Alcatraz Island, CA.

Next low tide (tomorrow) : in 36m at 10:27 pm (1.2 ft)
Next high tide : 4:46 am (4.2 ft)
Sunset today : 8:00 pm
Sunrise tomorrow : 6:27 am
Moon phase : Waxing Crescent (28% illuminated)
Tide Station Location : Station #9414792
Common Questions About Tides

Alcatraz Island, CA Tides - Jul 1943

< Jun 1943

Print this Tide Chart

Aug 1943 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Thu			1:08	4.7	6:02	-0.5	5:39	2.8	5:50	8:35		1	Thu
2	Fri			1:49	4.7	6:37	-0.5	6:21	2.9	5:51	8:35		2	Fri
3	Sat	12:13	6.0	2:26	4.8	7:10	-0.5	7:01	3.0	5:51	8:35		3	Sat
4	Sun	12:48	5.9	3:01	4.8	7:44	-0.5	7:42	3.0	5:52	8:35		4	Sun
5	Mon	1:24	5.7	3:36	4.8	8:17	-0.3	8:25	3.0	5:52	8:35		5	Mon
6	Tue	2:02	5.4	4:10	4.8	8:52	-0.1	9:12	2.9	5:53	8:35		6	Tue
7	Wed	2:43	5.1	4:46	4.9	9:28	0.1	10:06	2.8	5:53	8:34		7	Wed
8	Thu	3:30	4.7	5:24	5.0	10:07	0.4	11:08	2.6	5:54	8:34		8	Thu
9	Fri	4:25	4.3	6:04	5.2	10:50	0.8			5:55	8:34		9	Fri
10	Sat	5:36	4.0	6:45	5.4	12:14	2.3	11:38 AM	1.3	5:55	8:33		10	Sat
11	Sun	7:02	3.8	7:28	5.7	1:18	1.8	12:32	1.7	5:56	8:33		11	Sun
12	Mon	8:30	3.8	8:12	6.0	2:14	1.2	1:29	2.1	5:57	8:33		12	Mon
13	Tue	9:47	4.0	8:58	6.4	3:06	0.5	2:26	2.3	5:57	8:32		13	Tue
14	Wed	10:50	4.4	9:45	6.7	3:54	-0.2	3:21	2.5	5:58	8:32		14	Wed
15	Thu	11:45	4.7	10:33	6.9	4:41	-0.7	4:15	2.6	5:59	8:31		15	Thu
16	Fri			12:35	4.9	5:28	-1.2	5:08	2.6	5:59	8:31		16	Fri
17	Sat			1:22	5.2	6:15	-1.4	6:02	2.5	6:00	8:30		17	Sat
18	Sun	12:13	7.1	2:08	5.3	7:02	-1.5	6:57	2.4	6:01	8:30		18	Sun
19	Mon	1:06	6.9	2:53	5.5	7:49	-1.3	7:55	2.2	6:01	8:29		19	Mon
20	Tue	1:59	6.5	3:38	5.6	8:36	-1.0	8:57	2.1	6:02	8:28		20	Tue
21	Wed	2:56	5.9	4:24	5.8	9:24	-0.5	10:04	1.9	6:03	8:28		21	Wed
22	Thu	3:58	5.3	5:12	5.9	10:14	0.2	11:18	1.7	6:04	8:27		22	Thu
23	Fri	5:09	4.7	6:02	5.9	11:07	0.8			6:05	8:26		23	Fri
24	Sat	6:31	4.3	6:53	6.0	12:33	1.4	12:05	1.5	6:05	8:26		24	Sat
25	Sun	8:00	4.1	7:44	6.1	1:44	1.0	1:07	2.0	6:06	8:25		25	Sun
26	Mon	9:23	4.2	8:33	6.1	2:46	0.6	2:08	2.4	6:07	8:24		26	Mon
27	Tue	10:29	4.4	9:19	6.2	3:40	0.3	3:06	2.6	6:08	8:23		27	Tue
28	Wed	11:22	4.6	10:01	6.2	4:26	0.1	3:57	2.8	6:09	8:22		28	Wed
29	Thu			12:07	4.8	5:06	-0.1	4:43	2.8	6:09	8:22		29	Thu
30	Fri			12:45	4.8	5:42	-0.2	5:25	2.8	6:10	8:21		30	Fri
31	Sat			1:20	4.9	6:15	-0.2	6:04	2.8	6:11	8:20		31	Sat
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (9414792)

www.USHarbors.com

The US Harbors tide chart design is protected by copyright. It may be printed for personal use only.
Any commercial use, modification, redistribution, or repackaging without written permission is strictly prohibited.

What time does the tide turn (slack tide) in Alcatraz Island, CA today?

Slack tide in Alcatraz Island, CA is approximately 1:36 am — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Is this week a spring tide or neap tide in Alcatraz Island, CA?

Alcatraz Island, CA is currently in a transitional phase. Tonight's moon is 28% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are shifting between spring and neap.

What datum are Alcatraz Island, CA tide heights measured from?

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

What factors can affect the tide predictions for Alcatraz Island, CA?

Tide predictions for Alcatraz Island, CA come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Which NOAA station provides tide data for Alcatraz Island, CA?

Tide data for Alcatraz Island, CA is sourced from NOAA Station #9414792. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9414792.

What is the moon phase in Alcatraz Island, CA tonight?

Tonight the moon over Alcatraz Island, CA is Waxing Crescent (28% illuminated). This places Alcatraz Island, CA in a transitional tide cycle, so tidal ranges are shifting between spring and neap this week.

US Harbors Tidal Data

The data in our tide charts, tide tables, and tide graphs is provided by NOAA and others. These predictions are derived mathematically from numerous inputs, including data from historical tide stations and nearby locations where sensors are actively recording. As shown in the tide graph at the top of this page, “Predicted” tides (blue) are what forecasting models expect to happen. “Observed” tides (red) are those recorded by local sensors in real time, overlaid on the predictions for direct comparison. We display Observed water levels for a select group of harbors including Portland, Maine, where a physical sensor monitors water levels in real time.

LEARN MORE ABOUT OUR TIDE DATA

In The Zone: The Sabre 51 Salon Express

By US Harbors When Sabre Yachts completed construction of hull number 200 of its 48 Salon Express model, more than half the crew who built it had also worked on hull number one. The average tenure on that line was 12 years, and they produced a yacht that proved to… Learn More