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

TIDE TIMES for Friday, July 31, 2026
The tide is currently rising in Roche Harbor, San Juan Island, WA.

Next low tide (tomorrow) : 1:32 am (5.0 ft)
Next high tide : in 6h 33m at 8:05 pm (7.7 ft)
Sunset today : 8:51 pm
Sunrise tomorrow : 5:46 am
Moon phase : Waning Gibbous (95% illuminated)
Tide Station Location : Station #9449834
Common Questions About Tides

Featured Local Businesses

Roche Harbor Resort and Marina

Roche Harbor, San Juan Island, WA Tides - Aug 1975

< Jul 1975

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Sep 1975 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Fri			3:16	5.5	6:29	0.9	5:44	5.9	5:46	8:51		1	Fri
2	Sat			4:10	6.1	7:21	0.3	7:11	6.4	5:47	8:49		2	Sat
3	Sun	12:17	7.0	4:45	6.6	8:11	-0.4	8:22	6.5	5:49	8:48		3	Sun
4	Mon	1:09	7.1	5:14	7.0	8:58	-1.0	9:16	6.3	5:50	8:46		4	Mon
5	Tue	2:06	7.2	5:41	7.3	9:42	-1.5	10:04	5.9	5:51	8:45		5	Tue
6	Wed	3:07	7.3	6:08	7.5	10:26	-1.8	10:50	5.3	5:53	8:43		6	Wed
7	Thu	4:08	7.3	6:35	7.7	11:09	-1.7	11:37	4.5	5:54	8:42		7	Thu
8	Fri	5:09	7.2	7:05	7.9	11:52	-1.3			5:55	8:40		8	Fri
9	Sat	6:11	7.0	7:35	8.0	12:28	3.7	12:36	-0.5	5:57	8:38		9	Sat
10	Sun	7:15	6.6	8:08	8.1	1:21	2.7	1:21	0.6	5:58	8:37		10	Sun
11	Mon	8:24	6.2	8:43	8.0	2:16	1.8	2:07	1.8	5:59	8:35		11	Mon
12	Tue	9:42	5.8	9:20	7.9	3:14	1.0	2:57	3.1	6:01	8:33		12	Tue
13	Wed	11:18	5.6	10:00	7.7	4:14	0.5	3:53	4.3	6:02	8:32		13	Wed
14	Thu			1:05	5.9	5:16	0.1	5:02	5.3	6:04	8:30		14	Thu
15	Fri			2:33	6.3	6:21	-0.2	6:28	5.9	6:05	8:28		15	Fri
16	Sat			3:37	6.8	7:25	-0.3	8:01	6.1	6:06	8:26		16	Sat
17	Sun	12:38	6.7	4:26	7.2	8:24	-0.3	9:15	5.9	6:08	8:25		17	Sun
18	Mon	1:43	6.6	5:06	7.4	9:15	-0.3	10:06	5.5	6:09	8:23		18	Mon
19	Tue	2:46	6.5	5:39	7.4	9:58	-0.2	10:43	5.1	6:11	8:21		19	Tue
20	Wed	3:43	6.5	6:08	7.4	10:36	0.0	11:16	4.6	6:12	8:19		20	Wed
21	Thu	4:33	6.5	6:31	7.3	11:11	0.4	11:49	4.1	6:13	8:17		21	Thu
22	Fri	5:19	6.4	6:50	7.3	11:45	0.8			6:15	8:15		22	Fri
23	Sat	6:04	6.3	7:07	7.2	12:22	3.6	12:19	1.4	6:16	8:13		23	Sat
24	Sun	6:50	6.2	7:27	7.2	12:58	3.0	12:53	2.0	6:18	8:11		24	Sun
25	Mon	7:38	6.1	7:51	7.1	1:35	2.5	1:29	2.8	6:19	8:09		25	Mon
26	Tue	8:30	5.9	8:19	7.1	2:14	2.0	2:05	3.6	6:20	8:07		26	Tue
27	Wed	9:29	5.7	8:50	6.9	2:56	1.6	2:44	4.3	6:22	8:05		27	Wed
28	Thu	10:41	5.6	9:23	6.8	3:42	1.2	3:27	5.1	6:23	8:04		28	Thu
29	Fri			12:25	5.7	4:33	0.9	4:23	5.7	6:25	8:02		29	Fri
30	Sat			2:11	6.0	5:29	0.6	5:44	6.1	6:26	8:00		30	Sat
31	Sun			3:10	6.3	6:30	0.3	7:09	6.2	6:27	7:57		31	Sun
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 10:48 pm — 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 spring phase. Tonight's moon is 95% 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 maximum.

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 Waning Gibbous (95% illuminated). This places Roche Harbor, San Juan Island, WA in a spring tide cycle, so tidal ranges are near their weekly maximum 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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