Tides Today & Tomorrow in Boston, MA

TIDE TIMES for Wednesday, October 21, 2026
The tide is currently rising in Boston, MA.

Next low tide : 2:05 pm (1.9 ft)
Next high tide : in 5h 36m at 8:06 am (8.6 ft)
Sunset today : 5:52 pm
Sunrise tomorrow : 7:04 am
Moon phase : Waxing Gibbous (78% illuminated)
Tide Station Location : Station #8443970
Common Questions About Tides

Featured Local Businesses

Constitution Marina

Boston Yacht Sales

Boston, MA Tides - Feb 1799

< Jan 1799

Print this Tide Chart

Mar 1799 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Fri	8:14	10.0	9:02	8.5	1:52	1.0	2:45	0.0	7:01	5:02		1	Fri
2	Sat	9:11	10.1	9:56	8.7	2:51	1.0	3:40	-0.1	7:00	5:03		2	Sat
3	Sun	10:03	10.2	10:44	8.8	3:44	0.8	4:29	-0.2	6:59	5:05		3	Sun
4	Mon	10:49	10.2	11:27	8.9	4:32	0.7	5:13	-0.3	6:58	5:06		4	Mon
5	Tue	11:32	10.1			5:17	0.6	5:53	-0.2	6:57	5:07		5	Tue
6	Wed	12:07	9.0	12:14	10.0	6:00	0.6	6:31	-0.1	6:55	5:09		6	Wed
7	Thu	12:45	9.1	12:53	9.8	6:41	0.6	7:09	0.1	6:54	5:10		7	Thu
8	Fri	1:22	9.1	1:33	9.5	7:22	0.7	7:46	0.4	6:53	5:11		8	Fri
9	Sat	1:58	9.0	2:13	9.1	8:03	0.8	8:24	0.7	6:52	5:12		9	Sat
10	Sun	2:37	9.0	2:56	8.7	8:47	1.0	9:05	1.1	6:50	5:14		10	Sun
11	Mon	3:18	8.9	3:42	8.3	9:33	1.2	9:49	1.4	6:49	5:15		11	Mon
12	Tue	4:03	8.7	4:33	7.9	10:24	1.4	10:37	1.7	6:48	5:16		12	Tue
13	Wed	4:51	8.7	5:27	7.6	11:17	1.5	11:28	1.9	6:46	5:18		13	Wed
14	Thu	5:43	8.7	6:25	7.5			12:14	1.4	6:45	5:19		14	Thu
15	Fri	6:39	8.9	7:25	7.6	12:23	2.0	1:12	1.2	6:44	5:20		15	Fri
16	Sat	7:36	9.3	8:22	8.0	1:19	1.8	2:09	0.8	6:42	5:21		16	Sat
17	Sun	8:32	9.8	9:14	8.5	2:16	1.4	3:03	0.2	6:41	5:23		17	Sun
18	Mon	9:24	10.4	10:02	9.1	3:09	0.8	3:52	-0.4	6:39	5:24		18	Mon
19	Tue	10:13	10.9	10:49	9.7	4:00	0.1	4:39	-1.0	6:38	5:25		19	Tue
20	Wed	11:02	11.3	11:36	10.3	4:50	-0.5	5:25	-1.4	6:36	5:26		20	Wed
21	Thu	11:52	11.4			5:39	-1.0	6:11	-1.6	6:35	5:28		21	Thu
22	Fri	12:22	10.7	12:42	11.4	6:30	-1.3	6:58	-1.5	6:33	5:29		22	Fri
23	Sat	1:10	11.0	1:33	11.0	7:21	-1.3	7:45	-1.3	6:32	5:30		23	Sat
24	Sun	1:58	11.0	2:25	10.5	8:13	-1.2	8:35	-0.7	6:30	5:31		24	Sun
25	Mon	2:49	10.8	3:21	9.8	9:09	-0.8	9:28	-0.1	6:29	5:33		25	Mon
26	Tue	3:44	10.5	4:23	9.1	10:08	-0.3	10:26	0.5	6:27	5:34		26	Tue
27	Wed	4:43	10.1	5:28	8.6	11:12	0.1	11:27	1.1	6:26	5:35		27	Wed
28	Thu	5:47	9.7	6:38	8.3			12:18	0.5	6:24	5:36		28	Thu
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8443970)

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.

Is this week a spring tide or neap tide in Boston, MA?

Boston, MA is currently in a transitional phase. Tonight's moon is 78% 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 Boston, MA 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 Boston, MA?

Tide predictions for Boston, MA 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 Boston, MA?

Tide data for Boston, MA is sourced from NOAA Station #8443970. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8443970.

What is the moon phase in Boston, MA tonight?

Tonight the moon over Boston, MA is Waxing Gibbous (78% illuminated). This places Boston, MA 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

Quietly Sophisticated: The Hood 42 LM

By US Harbors At first glance, the Hood 42 LM might be confused for a boat that worked the Maine coast fifty years ago, but upon further inspection, the fifteen coats of Epifanes varnish over mahogany and custom-cast bronze hardware reveal that this boat was built for cruising. Beyond the… Learn More