Tides Today & Tomorrow in Roche Harbor, San Juan Island, WA

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently rising in Roche Harbor, San Juan Island, WA.

Next low tide (tomorrow) : 6:38 am (0.8 ft)
Next high tide : in 4h 49m at 10:51 pm (7.5 ft)
Sunset today : 9:04 pm
Sunrise tomorrow : 5:33 am
Moon phase : First Quarter (53% illuminated)
Tide Station Location : Station #9449834
Common Questions About Tides

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Roche Harbor Resort and Marina

Roche Harbor, San Juan Island, WA Tides - Jul 1989

< Jun 1989

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Aug 1989 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Sat	1:52	7.8	6:21	7.9	9:55	-2.8	10:15	7.3	5:14	9:18		1	Sat
2	Sun	2:38	7.6	7:02	8.2	10:39	-3.0	11:14	7.2	5:15	9:18		2	Sun
3	Mon	3:31	7.4	7:40	8.3	11:23	-2.9			5:15	9:17		3	Mon
4	Tue	4:26	7.1	8:16	8.2	12:10	6.9	12:07	-2.5	5:16	9:17		4	Tue
5	Wed	5:22	6.8	8:50	8.1	1:07	6.5	12:49	-1.9	5:17	9:17		5	Wed
6	Thu	6:17	6.3	9:21	8.0	2:07	6.0	1:31	-1.1	5:18	9:16		6	Thu
7	Fri	7:13	5.8	9:47	7.8	3:07	5.4	2:12	-0.1	5:18	9:16		7	Fri
8	Sat	8:16	5.2	10:10	7.7	4:05	4.6	2:52	1.1	5:19	9:15		8	Sat
9	Sun	9:29	4.6	10:31	7.6	4:58	3.7	3:30	2.3	5:20	9:14		9	Sun
10	Mon	11:11	4.3	10:52	7.4	5:46	2.8	4:09	3.6	5:21	9:14		10	Mon
11	Tue			2:07	4.6	6:30	1.9	4:53	4.9	5:22	9:13		11	Tue
12	Wed			4:03	5.5	7:12	1.1	6:02	6.0	5:23	9:12		12	Wed
13	Thu			4:58	6.3	7:53	0.3	7:34	6.7	5:24	9:12		13	Thu
14	Fri	12:15	7.1	5:34	6.9	8:32	-0.4	8:53	7.1	5:25	9:11		14	Fri
15	Sat	12:50	7.0	6:05	7.3	9:12	-1.0	9:51	7.3	5:26	9:10		15	Sat
16	Sun	1:32	7.1	6:33	7.6	9:51	-1.5	10:32	7.3	5:27	9:09		16	Sun
17	Mon	2:21	7.1	7:00	7.8	10:31	-2.0	11:09	7.1	5:28	9:08		17	Mon
18	Tue	3:16	7.2	7:26	7.9	11:11	-2.3	11:49	6.8	5:29	9:07		18	Tue
19	Wed	4:14	7.2	7:51	8.0	11:52	-2.3			5:31	9:06		19	Wed
20	Thu	5:13	7.0	8:17	8.1	12:34	6.3	12:32	-2.0	5:32	9:05		20	Thu
21	Fri	6:15	6.6	8:43	8.1	1:25	5.6	1:13	-1.3	5:33	9:04		21	Fri
22	Sat	7:21	6.1	9:10	8.1	2:20	4.6	1:55	-0.3	5:34	9:03		22	Sat
23	Sun	8:34	5.5	9:37	8.1	3:16	3.4	2:36	1.1	5:35	9:02		23	Sun
24	Mon	10:00	5.0	10:07	8.1	4:13	2.1	3:19	2.7	5:37	9:01		24	Mon
25	Tue	11:55	4.9	10:38	8.0	5:10	0.9	4:06	4.2	5:38	8:59		25	Tue
26	Wed			2:10	5.5	6:08	-0.2	5:06	5.6	5:39	8:58		26	Wed
27	Thu			3:44	6.4	7:05	-1.0	6:32	6.7	5:40	8:57		27	Thu
28	Fri			4:42	7.1	8:01	-1.6	8:08	7.1	5:42	8:56		28	Fri
29	Sat	12:41	7.4	5:25	7.6	8:54	-1.9	9:27	7.1	5:43	8:54		29	Sat
30	Sun	1:39	7.2	6:02	7.9	9:44	-2.0	10:27	6.8	5:44	8:53		30	Sun
31	Mon	2:42	7.1	6:36	7.9	10:29	-1.9	11:14	6.4	5:45	8:51		31	Mon
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (9449834)

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What time does the tide turn (slack tide) in Roche Harbor, San Juan Island, WA today?

Slack tide in Roche Harbor, San Juan Island, WA is approximately 2:44 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 Roche Harbor, San Juan Island, WA?

Roche Harbor, San Juan Island, WA is currently in a neap phase. Tonight's moon is 53% 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 Roche Harbor, San Juan Island, WA 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 Roche Harbor, San Juan Island, WA?

Tide predictions for Roche Harbor, San Juan Island, WA 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 Roche Harbor, San Juan Island, WA?

Tide data for Roche Harbor, San Juan Island, WA is sourced from NOAA Station #9449834. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=9449834.

What is the moon phase in Roche Harbor, San Juan Island, WA tonight?

Tonight the moon over Roche Harbor, San Juan Island, WA is First Quarter (53% illuminated). This places Roche Harbor, San Juan Island, WA 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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