Southwest Harbor, ME tide chart

High and low waters at NOAA tide prediction station 8413564, Southwest Harbor, in feet above mean lower low water and in local clock time. Tables below are grouped by calendar month, so each one stays correct for the whole month it names.

Predictions stored for Saturday, October 17 to Friday, October 23 (7 days, 27 high and low waters), retrieved from NOAA on 2026-10-17.

The week of Saturday, October 17

First high water shown3:55 a.m.8.724 ft, Saturday, October 17

First low water shown9:28 a.m.2.31 ft, Saturday, October 17

Highest in the stored range10.342 ftFriday, October 23, 9:23 p.m.

Lowest in the stored range0.655 ftFriday, October 23, 2:48 p.m.

Saturday, October 17 to Friday, October 23 at Southwest Harbor. Cyan means the water is rising, violet means it is falling. The dots are NOAA's predicted extremes; the line between two dots is a half-cosine interpolation, not a NOAA value. Your browser will move this to the current week if it can.

Water rising (flood)Water falling (ebb)Now, when your browser can draw it

Tide times at Southwest Harbor, October 17–23, 2026

Stored predictions cover October 17 to 23 only, so this table is a part month. The full month is available from NOAA through the printable tool.

Predicted high and low waters at NOAA station 8413564 (Southwest Harbor), October 17–23, 2026, feet above MLLW, local clock time with daylight saving applied where in effect.
Date	Tide	Time (local)	Height, ft above MLLW
Saturday, October 17	High	3:55 a.m.	8.724
	Low	9:28 a.m.	2.31
	High	4:04 p.m.	9.511
	Low	10:08 p.m.	1.525
Sunday, October 18	High	4:48 a.m.	8.495
	Low	10:22 a.m.	2.467
	High	4:59 p.m.	9.29
	Low	11:04 p.m.	1.649
Monday, October 19	High	5:45 a.m.	8.453
	Low	11:20 a.m.	2.449
	High	5:58 p.m.	9.236
	Low	11:59 p.m.	1.595
Tuesday, October 20	High	6:41 a.m.	8.632
	Low	12:18 p.m.	2.231
	High	6:55 p.m.	9.357
Wednesday, October 21	Low	12:52 a.m.	1.385
	High	7:33 a.m.	9.015
	Low	1:12 p.m.	1.825
	High	7:48 p.m.	9.621
Thursday, October 22	Low	1:40 a.m.	1.075
	High	8:20 a.m.	9.553
	Low	2:02 p.m.	1.278
	High	8:37 p.m.	9.97
Friday, October 23	Low	2:25 a.m.	0.73
	High	9:03 a.m.	10.181
	Low	2:48 p.m.	0.655
	High	9:23 p.m.	10.342

Printed from TideCurve. Predictions: NOAA CO-OPS station 8413564, datum MLLW, stored range 2026-10-17 to 2026-10-23, retrieved 2026-10-17. Astronomical predictions only.

Pick any dates for Southwest Harbor in the printable tool, which requests them from NOAA when you open it.

What the numbers at this station mean

Heights are feet above mean lower low water, the datum NOAA uses for tide predictions on US coasts. A predicted height of 0.655 ft does not mean 0.655 ft of water under a boat: it means the surface is predicted to be 0.655 ft above the chart datum, and the depth at any spot is whatever the chart says plus that number.

Mean range across the stored period. The average height difference between one extreme and the next is 7.67 ft here, with the largest single swing 9.69 ft and the smallest 6 ft.
Spacing. Successive high waters sit 12 h 25 min apart on average, which is why a tide that is convenient this morning is inconvenient within a few days.
Type. This station returned 14 high waters and 13 low waters across 7 days. Where those counts are not close to two a day, the station's tide is not a simple twice-daily cycle and the curve above will look it.

Station provenance

NOAA station	Southwest Harbor (8413564), Maine
Coordinates	44.275, -68.3133
Prediction type	Subordinate station. Predictions are derived by applying time and height offsets to a reference station, Bar Harbor (8413320).
Datum	MLLW — mean lower low water
Units	Feet
Time zone	America/New_York. Requested with `time_zone=lst_ldt`, so NOAA returns local standard time corrected for daylight saving time while it is in effect. Times on this page are clock times at the station, and no second conversion is applied anywhere.
Stored coverage	2026-10-17 to 2026-10-23 — 7 days, 27 predicted high and low waters, served at `/data/tides/8413564.json`
Retrieved	Station metadata 2026-10-16; predictions 2026-10-17
Request	`https://api.tidesandcurrents.noaa.gov/api/prod/datagetter?product=predictions&datum=MLLW&station=8413564&time_zone=lst_ldt&units=english&interval=hilo&format=json&begin_date=20261017&end_date=20261023`
Source	NOAA CO-OPS Data API, public domain. Station metadata from the CO-OPS Metadata API.

What these predictions are not. They are astronomical: the tide the sun and moon would produce on their own. NOAA's own FAQ puts it plainly — "we can only predict the astronomical tides" and not "the effect that wind, rain, freshwater runoff" have on the water level (NOAA Tides & Currents FAQ). A storm, a strong onshore wind or a wet week can put the water well above the line, and a hard offshore wind can hold it below. Nothing on this page tells you whether a place is safe to walk, swim, anchor or cross, and times of slack water are a different quantity again — see high tide vs slack tide.

Nearby stations

Predictions change along a coast, inside a harbour and up an estuary. If your spot is closer to one of these, use that station instead.

Bass Harbor, ME — station 8413651, about 3 mi away
Bar Harbor, ME — station 8413320, about 10 mi away
Prospect Harbor, ME — station 8412932, about 17 mi away
Stonington, Deer Isle, ME — station 8414348, about 19 mi away
Castine, ME — station 8414672, about 25 mi away

Or compare the whole coast on Maine tide charts, which ranks every Maine station by mean tidal range so you can see how much this one moves against its neighbours, see every station on the list, or read how these pages were built.