Tides Today & Tomorrow in Southwest Harbor, ME
Featured Local Businesses
Printing our tide charts?
Help us keep our doors open and lights on by registering as a member of US Harbors.
It's simple and free!
Southwest Harbor, ME Tides - Aug 1999
| Date | High Tide | Low Tide | Sun | Moon | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AM | ft | PM | ft | AM | ft | PM | ft | Rise | Set | |||
| 1 | Sun | 1:46 | 11.2 | 2:16 | 10.8 | 7:39 | -0.2 | 7:57 | 0.5 | 5:20 | 7:58 |  |
| 2 | Mon | 2:31 | 11.1 | 3:01 | 10.9 | 8:22 | -0.2 | 8:46 | 0.4 | 5:21 | 7:57 | |
| 3 | Tue | 3:20 | 10.9 | 3:50 | 11.1 | 9:09 | -0.1 | 9:40 | 0.3 | 5:22 | 7:56 | |
| 4 | Wed | 4:14 | 10.6 | 4:44 | 11.1 | 10:01 | 0.1 | 10:38 | 0.3 | 5:23 | 7:54 | |
| 5 | Thu | 5:13 | 10.3 | 5:42 | 11.2 | 10:57 | 0.3 | 11:41 | 0.1 | 5:24 | 7:53 |  |
| 6 | Fri | 6:17 | 10.1 | 6:43 | 11.3 | 11:59 | 0.5 | 5:26 | 7:52 | | ||
| 7 | Sat | 7:23 | 10.1 | 7:47 | 11.5 | 12:46 | -0.1 | 1:02 | 0.5 | 5:27 | 7:50 | |
| 8 | Sun | 8:28 | 10.3 | 8:48 | 11.8 | 1:50 | -0.4 | 2:06 | 0.3 | 5:28 | 7:49 |  |
| 9 | Mon | 9:29 | 10.6 | 9:46 | 12.1 | 2:51 | -0.7 | 3:06 | 0.1 | 5:29 | 7:48 | |
| 10 | Tue | 10:25 | 10.9 | 10:41 | 12.3 | 3:48 | -1.0 | 4:03 | -0.1 | 5:30 | 7:46 | |
| 11 | Wed | 11:18 | 11.1 | 11:34 | 12.3 | 4:41 | -1.2 | 4:57 | -0.3 | 5:31 | 7:45 |  |
| 12 | Thu | 12:08 | 11.3 | 5:32 | -1.2 | 5:48 | -0.3 | 5:32 | 7:43 | | ||
| 13 | Fri | 12:23 | 12.1 | 12:56 | 11.2 | 6:20 | -1.0 | 6:37 | -0.1 | 5:33 | 7:42 | |
| 14 | Sat | 1:12 | 11.8 | 1:42 | 11.1 | 7:06 | -0.7 | 7:26 | 0.1 | 5:35 | 7:40 | |
| 15 | Sun | 2:00 | 11.3 | 2:28 | 10.9 | 7:52 | -0.2 | 8:14 | 0.4 | 5:36 | 7:39 |  |
| 16 | Mon | 2:47 | 10.8 | 3:14 | 10.6 | 8:37 | 0.3 | 9:03 | 0.7 | 5:37 | 7:37 | |
| 17 | Tue | 3:36 | 10.2 | 4:01 | 10.3 | 9:23 | 0.8 | 9:53 | 1.0 | 5:38 | 7:36 | |
| 18 | Wed | 4:27 | 9.6 | 4:51 | 10.0 | 10:11 | 1.3 | 10:46 | 1.3 | 5:39 | 7:34 | |
| 19 | Thu | 5:21 | 9.2 | 5:43 | 9.8 | 11:02 | 1.6 | 11:41 | 1.4 | 5:40 | 7:32 |  |
| 20 | Fri | 6:17 | 8.9 | 6:37 | 9.7 | 11:56 | 1.9 | 5:42 | 7:31 | | ||
| 21 | Sat | 7:14 | 8.8 | 7:31 | 9.7 | 12:37 | 1.4 | 12:51 | 1.9 | 5:43 | 7:29 | |
| 22 | Sun | 8:09 | 8.9 | 8:23 | 10.0 | 1:32 | 1.3 | 1:44 | 1.8 | 5:44 | 7:28 | |
| 23 | Mon | 8:59 | 9.1 | 9:11 | 10.3 | 2:23 | 1.0 | 2:33 | 1.6 | 5:45 | 7:26 |  |
| 24 | Tue | 9:45 | 9.4 | 9:55 | 10.6 | 3:09 | 0.7 | 3:19 | 1.3 | 5:46 | 7:24 | |
| 25 | Wed | 10:27 | 9.8 | 10:37 | 11.0 | 3:52 | 0.3 | 4:02 | 1.0 | 5:47 | 7:22 | |
| 26 | Thu | 11:07 | 10.2 | 11:18 | 11.3 | 4:32 | 0.0 | 4:43 | 0.6 | 5:48 | 7:21 | |
| 27 | Fri | 11:45 | 10.6 | 11:58 | 11.5 | 5:11 | -0.3 | 5:24 | 0.3 | 5:50 | 7:19 |  |
| 28 | Sat | 12:25 | 11.0 | 5:50 | -0.4 | 6:05 | 0.0 | 5:51 | 7:17 | | ||
| 29 | Sun | 12:40 | 11.6 | 1:06 | 11.3 | 6:30 | -0.5 | 6:49 | -0.2 | 5:52 | 7:16 | |
| 30 | Mon | 1:24 | 11.6 | 1:49 | 11.5 | 7:12 | -0.5 | 7:36 | -0.3 | 5:53 | 7:14 | |
| 31 | Tue | 2:11 | 11.4 | 2:36 | 11.5 | 7:58 | -0.4 | 8:27 | -0.3 | 5:54 | 7:12 | |
| Date | High Tide | Low Tide | Sun | Moon | ||||||||
| AM | ft | PM | ft | AM | ft | PM | ft | Rise | Set | |||
www.USHarbors.com
© 2026 US Harbors LLC All rights reserved
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.
Common Questions About Southwest Harbor, ME Tides
Show AllWhat time does the tide turn (slack tide) in Southwest Harbor, ME today?
Slack tide in Southwest Harbor, ME is approximately 9:25 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 spring phase. Tonight's moon is 97% 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 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 Full Moon (97% illuminated). This places Southwest Harbor, ME 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.
FEATURED CONTENT
In The Zone: The Sabre 51 Salon Express
By US Harbors When Sabre Yachts completed construction of hull number 200 of its 48 Salon Express model, more than half the crew who built it had also worked on hull number one. The average tenure on that line was 12 years, and they produced a yacht that proved to… Learn More
Coastal News Updates See All
El Nino Forms, Expected To Strengthen, Say NOAA Forecasters
By noaa.gov, noaa.gov. NOAA’s National Weather Service announced today that El Nino has developed in… More
New eDNA Tool To Help Track Recovery Of Sunflower Sea Star, a Pacific Coast ‘Apex Predator’
By noaa.gov, noaa.gov. A wasting disease that surged during the intense 2013-2016 Pacific marine heatwave… More
What World Ocean Day Can Look Like in 100 Years
By noaa.gov, noaa.gov. More often than not, when we talk about ocean conservation, the conversation… More
NOAA Strengthens Commitment to Aquaculture Through New Cooperative Institute
By noaa.gov, noaa.gov. Today, NOAA announced the University of New Hampshire as host institution for the new… More
Moderate Harmful Algal Bloom Predicted for Western Lake Erie
By noaa.gov, noaa.gov. NOAA and its research partners are forecasting a moderate harmful algal bloom… More
2026 Best Harbor Contest Winners Announced!
Padanaram, South Dartmouth, MA Wins Best Harbor Padanaram, Massachusetts is the Grand Winner, Best Harbor… More
A Tale of Two Gulf of Alaska Crossings: Yacht and Tugboat
By Norris Comer, best4boats. The Gulf of Alaska is one of those bodies of water… More
7 Ways El Niño and Large Marine Heatwave Could Affect West Coast Marine Species
By fisheries.noaa.gov, fisheries.noaa.gov. A large marine heatwave has bathed parts of the West Coast in very warm… More
Meet The Great Marsh Shellfish Company, Oyster Growers in Massachusetts
By fisheries.noaa.gov, fisheries.noaa.gov. When you farm shellfish on Massachusetts’ beautiful coastal marshes, the world is… More
