Tides Today & Tomorrow in Port San Luis, CA

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently falling in Port San Luis, CA.

Next low tide (tomorrow) : in 2h 31m at 12:19 am (1.1 ft)
Next high tide (tomorrow) : 6:29 am (2.9 ft)
Sunset today : 11:21 pm
Sunrise tomorrow : 9:11 am
Moon phase : First Quarter (52% illuminated)
Tide Station Location : Station #9412110
Common Questions About Tides

Port San Luis, CA Tides - Apr 1991

< Mar 1991

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May 1991 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Mon	11:33	3.7	10:53	5.2	5:19	-0.2	4:39	1.7	8:56	9:30		1	Mon
2	Tue			12:27	3.3	6:03	-0.1	5:05	2.1	8:55	9:31		2	Tue
3	Wed			1:33	3.1	6:51	0.1	5:31	2.5	8:53	9:32		3	Wed
4	Thu	12:00	4.7	3:08	2.9	7:48	0.3	5:59	2.7	8:52	9:33		4	Thu
5	Fri	12:43	4.4			8:59	0.5			8:51	9:34		5	Fri
6	Sat	1:47	4.1	6:10	3.2	10:12	0.5	9:22	3.0	8:49	9:34		6	Sat
7	Sun	4:14	4.0	7:37	3.4			12:11	0.4	9:48	10:35		7	Sun
8	Mon	5:34	4.0	7:58	3.6	12:03	2.8	12:58	0.3	9:46	10:36		8	Mon
9	Tue	6:38	4.1	8:17	3.9	1:03	2.4	1:36	0.3	9:45	10:37		9	Tue
10	Wed	7:33	4.2	8:37	4.2	1:49	1.9	2:09	0.3	9:44	10:38		10	Wed
11	Thu	8:22	4.3	8:58	4.6	2:29	1.3	2:38	0.4	9:42	10:38		11	Thu
12	Fri	9:08	4.3	9:21	5.0	3:08	0.8	3:07	0.6	9:41	10:39		12	Fri
13	Sat	9:54	4.3	9:48	5.4	3:48	0.2	3:37	0.9	9:40	10:40		13	Sat
14	Sun	10:42	4.1	10:18	5.7	4:30	-0.3	4:08	1.2	9:39	10:41		14	Sun
15	Mon	11:35	3.9	10:53	5.9	5:15	-0.7	4:41	1.6	9:37	10:42		15	Mon
16	Tue			12:32	3.7	6:04	-0.9	5:18	1.9	9:36	10:42		16	Tue
17	Wed			1:37	3.5	6:57	-1.0	6:00	2.2	9:35	10:43		17	Wed
18	Thu	12:18	5.8	2:52	3.3	7:55	-0.9	6:51	2.5	9:33	10:44		18	Thu
19	Fri	1:11	5.5	4:18	3.3	9:01	-0.8	8:02	2.8	9:32	10:45		19	Fri
20	Sat	2:16	5.2	5:31	3.6	10:12	-0.6	9:47	2.8	9:31	10:46		20	Sat
21	Sun	3:37	4.8	6:26	3.9	11:19	-0.5	11:29	2.4	9:30	10:46		21	Sun
22	Mon	5:03	4.5	7:09	4.2			12:17	-0.3	9:28	10:47		22	Mon
23	Tue	6:22	4.3	7:46	4.6	12:46	1.8	1:07	-0.1	9:27	10:48		23	Tue
24	Wed	7:31	4.2	8:19	5.0	1:47	1.2	1:50	0.2	9:26	10:49		24	Wed
25	Thu	8:32	4.1	8:49	5.3	2:39	0.6	2:27	0.6	9:25	10:50		25	Thu
26	Fri	9:25	4.0	9:17	5.5	3:23	0.1	3:01	1.0	9:24	10:50		26	Fri
27	Sat	10:14	3.9	9:45	5.6	4:05	-0.3	3:32	1.4	9:23	10:51		27	Sat
28	Sun	11:02	3.7	10:13	5.6	4:44	-0.5	4:01	1.8	9:22	10:52		28	Sun
29	Mon	11:50	3.6	10:41	5.5	5:23	-0.6	4:29	2.1	9:20	10:53		29	Mon
30	Tue			12:39	3.4	6:03	-0.6	4:58	2.4	9:19	10:54		30	Tue
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (9412110)

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What time does the tide turn (slack tide) in Port San Luis, CA today?

Slack tide in Port San Luis, CA is approximately 3:24 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 Port San Luis, CA?

Port San Luis, CA is currently in a neap phase. Tonight's moon is 52% 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 near their weekly minimum.

What datum are Port San Luis, 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 Port San Luis, CA?

Tide predictions for Port San Luis, 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 Port San Luis, CA?

Tide data for Port San Luis, CA is sourced from NOAA Station #9412110. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9412110.

What is the moon phase in Port San Luis, CA tonight?

Tonight the moon over Port San Luis, CA is First Quarter (52% illuminated). This places Port San Luis, CA in a neap tide cycle, so tidal ranges are near their weekly minimum 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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