Tides Today & Tomorrow in Southwest Harbor, ME

TIDE TIMES for Tuesday, August 18, 2026
The tide is currently rising in Southwest Harbor, ME.

Next low tide : 9:08 am (0.8 ft)
Next high tide : in 2h 34m at 3:25 am (10.2 ft)
Sunset today : 7:33 pm
Sunrise tomorrow : 5:40 am
Moon phase : First Quarter (36% illuminated)
Tide Station Location : Station #8413564
Common Questions About Tides

Featured Local Businesses

A red hull lobster yacht cruising in calm water

John Williams Boat Company

Hamilton Marine - Southwest Harbor

Clark Point Gallery

Bowden Marine

Billings Diesel & Marine

Southwest Harbor, ME Tides - Oct 1961

< Sep 1961

Print this Tide Chart

Nov 1961 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Sun	4:48	9.7	5:07	10.2	10:29	1.3	11:08	0.8	6:30	6:14		1	Sun
2	Mon	5:49	9.4	6:07	9.9	11:29	1.6			6:32	6:13		2	Mon
3	Tue	6:49	9.2	7:07	9.8	12:08	1.0	12:29	1.7	6:33	6:11		3	Tue
4	Wed	7:46	9.3	8:03	9.9	1:06	1.0	1:26	1.6	6:34	6:09		4	Wed
5	Thu	8:37	9.5	8:53	10.1	1:58	0.9	2:18	1.3	6:35	6:07		5	Thu
6	Fri	9:22	9.8	9:38	10.3	2:45	0.7	3:04	1.0	6:37	6:05		6	Fri
7	Sat	10:03	10.1	10:19	10.5	3:27	0.6	3:46	0.7	6:38	6:04		7	Sat
8	Sun	10:40	10.4	10:57	10.6	4:06	0.4	4:24	0.5	6:39	6:02		8	Sun
9	Mon	11:15	10.7	11:34	10.6	4:42	0.4	5:01	0.3	6:40	6:00		9	Mon
10	Tue	11:48	10.9			5:16	0.4	5:36	0.1	6:41	5:58		10	Tue
11	Wed	12:09	10.6	12:23	11.0	5:50	0.4	6:12	0.1	6:43	5:56		11	Wed
12	Thu	12:46	10.6	12:58	11.1	6:25	0.5	6:50	0.0	6:44	5:55		12	Thu
13	Fri	1:25	10.4	1:37	11.1	7:02	0.6	7:31	0.0	6:45	5:53		13	Fri
14	Sat	2:07	10.3	2:20	11.0	7:44	0.8	8:17	0.1	6:46	5:51		14	Sat
15	Sun	2:54	10.1	3:09	10.9	8:32	1.0	9:09	0.2	6:48	5:50		15	Sun
16	Mon	3:47	9.9	4:05	10.8	9:26	1.1	10:07	0.3	6:49	5:48		16	Mon
17	Tue	4:47	9.8	5:08	10.7	10:27	1.1	11:10	0.3	6:50	5:46		17	Tue
18	Wed	5:52	9.9	6:14	10.7	11:34	1.0			6:51	5:44		18	Wed
19	Thu	6:58	10.2	7:22	11.0	12:15	0.1	12:42	0.6	6:53	5:43		19	Thu
20	Fri	8:00	10.7	8:25	11.3	1:19	-0.2	1:47	0.1	6:54	5:41		20	Fri
21	Sat	8:58	11.3	9:24	11.7	2:18	-0.6	2:46	-0.5	6:55	5:40		21	Sat
22	Sun	9:52	11.9	10:18	11.9	3:13	-0.9	3:42	-1.0	6:57	5:38		22	Sun
23	Mon	10:42	12.3	11:10	12.0	4:05	-1.1	4:34	-1.4	6:58	5:36		23	Mon
24	Tue	11:30	12.5			4:54	-1.0	5:24	-1.5	6:59	5:35		24	Tue
25	Wed	12:00	11.9	12:17	12.4	5:42	-0.8	6:13	-1.4	7:01	5:33		25	Wed
26	Thu	12:49	11.6	1:04	12.1	6:30	-0.4	7:02	-1.0	7:02	5:32		26	Thu
27	Fri	1:38	11.1	1:52	11.6	7:18	0.1	7:51	-0.5	7:03	5:30		27	Fri
28	Sat	2:28	10.6	2:41	11.1	8:07	0.7	8:42	0.0	7:04	5:29		28	Sat
29	Sun	2:20	10.0	2:33	10.5	7:59	1.2	8:34	0.5	6:06	4:27		29	Sun
30	Mon	3:14	9.6	3:28	10.0	8:53	1.6	9:29	0.9	6:07	4:26		30	Mon
31	Tue	4:11	9.3	4:26	9.6	9:51	1.9	10:26	1.2	6:08	4:24		31	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: (8413564)

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 Southwest Harbor, ME today?

Slack tide in Southwest Harbor, ME is approximately 6:16 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 Southwest Harbor, ME?

Southwest Harbor, ME is currently in a transitional phase. Tonight's moon is 36% 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 Southwest Harbor, ME 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 Southwest Harbor, ME?

Tide predictions for Southwest Harbor, ME 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 Southwest Harbor, ME?

Tide data for Southwest Harbor, ME is sourced from NOAA Station #8413564. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8413564.

What is the moon phase in Southwest Harbor, ME tonight?

Tonight the moon over Southwest Harbor, ME is First Quarter (36% illuminated). This places Southwest Harbor, ME 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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