Tides Today & Tomorrow in Alcatraz Island, CA

TIDE TIMES for Monday, September 21, 2026
The tide is currently falling in Alcatraz Island, CA.

Next low tide (tomorrow) : in 6h 44m at 3:36 am (0.4 ft)
Next high tide (tomorrow) : 10:40 am (4.8 ft)
Sunset today : 7:08 pm
Sunrise tomorrow : 6:56 am
Moon phase : Waxing Gibbous (76% illuminated)
Tide Station Location : Station #9414792
Common Questions About Tides

Alcatraz Island, CA Tides - Jul 1872

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Aug 1872 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Mon	9:41	4.1	8:35	6.2	2:59	0.1	2:12	2.5	4:58	7:42		1	Mon
2	Tue	10:41	4.4	9:11	6.2	3:43	-0.2	3:01	2.8	4:58	7:42		2	Tue
3	Wed	11:32	4.5	9:47	6.2	4:23	-0.4	3:47	3.1	4:59	7:42		3	Wed
4	Thu			12:16	4.6	4:59	-0.5	4:30	3.2	4:59	7:42		4	Thu
5	Fri			12:56	4.7	5:34	-0.6	5:11	3.3	5:00	7:41		5	Fri
6	Sat			1:32	4.7	6:07	-0.6	5:51	3.3	5:00	7:41		6	Sat
7	Sun			2:05	4.7	6:41	-0.5	6:30	3.2	5:01	7:41		7	Sun
8	Mon	12:12	5.8	2:38	4.7	7:14	-0.5	7:12	3.2	5:02	7:41		8	Mon
9	Tue	12:50	5.6	3:10	4.7	7:48	-0.3	7:58	3.1	5:02	7:40		9	Tue
10	Wed	1:30	5.2	3:43	4.8	8:23	0.0	8:51	2.9	5:03	7:40		10	Wed
11	Thu	2:16	4.8	4:18	5.0	9:00	0.3	9:53	2.7	5:03	7:40		11	Thu
12	Fri	3:11	4.4	4:54	5.2	9:40	0.7	10:59	2.3	5:04	7:39		12	Fri
13	Sat	4:21	4.0	5:32	5.5	10:24	1.3			5:05	7:39		13	Sat
14	Sun	5:50	3.7	6:12	5.8	12:04	1.7	11:15 AM	1.8	5:06	7:38		14	Sun
15	Mon	7:28	3.7	6:55	6.1	1:04	1.1	12:11	2.3	5:06	7:38		15	Mon
16	Tue	8:52	4.0	7:41	6.5	1:58	0.3	1:11	2.7	5:07	7:37		16	Tue
17	Wed	10:00	4.3	8:30	6.8	2:50	-0.3	2:09	3.0	5:08	7:37		17	Wed
18	Thu	10:56	4.6	9:21	7.0	3:39	-0.9	3:06	3.0	5:08	7:36		18	Thu
19	Fri	11:45	4.9	10:13	7.2	4:28	-1.4	4:02	3.0	5:09	7:35		19	Fri
20	Sat			12:31	5.1	5:17	-1.6	4:57	2.9	5:10	7:35		20	Sat
21	Sun			1:15	5.2	6:05	-1.6	5:53	2.7	5:11	7:34		21	Sun
22	Mon			1:58	5.4	6:52	-1.4	6:52	2.5	5:12	7:33		22	Mon
23	Tue	12:54	6.6	2:40	5.5	7:38	-1.0	7:54	2.3	5:12	7:33		23	Tue
24	Wed	1:50	6.0	3:24	5.6	8:24	-0.5	9:01	2.0	5:13	7:32		24	Wed
25	Thu	2:52	5.3	4:08	5.8	9:10	0.2	10:14	1.7	5:14	7:31		25	Thu
26	Fri	4:02	4.6	4:53	5.9	9:59	1.0	11:28	1.4	5:15	7:30		26	Fri
27	Sat	5:27	4.1	5:40	5.9	10:54	1.7			5:16	7:29		27	Sat
28	Sun	7:03	3.9	6:28	6.0	12:39	1.0	11:54 AM	2.3	5:16	7:28		28	Sun
29	Mon	8:31	4.1	7:16	6.0	1:42	0.6	12:57	2.8	5:17	7:28		29	Mon
30	Tue	9:39	4.4	8:02	6.1	2:36	0.3	1:57	3.1	5:18	7:27		30	Tue
31	Wed	10:31	4.6	8:46	6.1	3:22	0.0	2:50	3.2	5:19	7:26		31	Wed
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)

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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 76% 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 Gibbous (76% 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

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