Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, August 31, 2026
The tide is currently rising in Portsmouth, NH.

Next low tide : 8:19 pm (-0.1 ft)
Next high tide : in 5h 28m at 2:12 pm (8.7 ft)
Sunset today : 7:19 pm
Sunrise tomorrow : 6:06 am
Moon phase : Waning Gibbous (87% illuminated)
Tide Station Location : Station #8423745
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Portsmouth, NH Tides - May 1938

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Jun 1938 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Sun	12:22	9.6	1:00	8.7	6:40	-1.2	6:51	-0.3	5:36	7:43		1	Sun
2	Mon	1:09	9.8	1:49	8.7	7:28	-1.3	7:40	-0.3	5:35	7:44		2	Mon
3	Tue	1:59	9.8	2:41	8.6	8:19	-1.2	8:32	-0.2	5:34	7:45		3	Tue
4	Wed	2:52	9.6	3:37	8.4	9:13	-1.0	9:29	0.1	5:32	7:46		4	Wed
5	Thu	3:49	9.3	4:38	8.3	10:11	-0.7	10:30	0.3	5:31	7:47		5	Thu
6	Fri	4:53	8.9	5:41	8.2	11:12	-0.4	11:36	0.5	5:30	7:48		6	Fri
7	Sat	5:59	8.5	6:45	8.2			12:15	-0.1	5:29	7:50		7	Sat
8	Sun	7:06	8.3	7:48	8.3	12:45	0.6	1:19	0.1	5:27	7:51		8	Sun
9	Mon	8:13	8.1	8:47	8.5	1:54	0.5	2:21	0.2	5:26	7:52		9	Mon
10	Tue	9:15	8.1	9:41	8.7	2:58	0.2	3:18	0.3	5:25	7:53		10	Tue
11	Wed	10:11	8.1	10:29	8.8	3:55	0.0	4:09	0.3	5:24	7:54		11	Wed
12	Thu	11:02	8.1	11:14	8.9	4:45	-0.2	4:55	0.4	5:23	7:55		12	Thu
13	Fri	11:48	8.0	11:56	8.9	5:31	-0.3	5:38	0.5	5:21	7:56		13	Fri
14	Sat			12:32	7.9	6:14	-0.3	6:19	0.6	5:20	7:57		14	Sat
15	Sun	12:36	8.8	1:13	7.8	6:54	-0.2	6:57	0.8	5:19	7:58		15	Sun
16	Mon	1:14	8.7	1:52	7.7	7:32	-0.1	7:35	0.9	5:18	7:59		16	Mon
17	Tue	1:51	8.5	2:31	7.5	8:10	0.1	8:14	1.1	5:17	8:00		17	Tue
18	Wed	2:29	8.3	3:11	7.4	8:48	0.3	8:54	1.3	5:16	8:01		18	Wed
19	Thu	3:10	8.1	3:54	7.3	9:28	0.5	9:38	1.4	5:15	8:02		19	Thu
20	Fri	3:53	7.9	4:38	7.2	10:11	0.6	10:25	1.5	5:14	8:03		20	Fri
21	Sat	4:40	7.7	5:25	7.3	10:56	0.8	11:15	1.5	5:13	8:04		21	Sat
22	Sun	5:30	7.5	6:12	7.4	11:42	0.9			5:13	8:05		22	Sun
23	Mon	6:23	7.4	7:00	7.6	12:08	1.5	12:31	0.9	5:12	8:06		23	Mon
24	Tue	7:18	7.4	7:50	7.9	1:03	1.2	1:21	0.9	5:11	8:07		24	Tue
25	Wed	8:15	7.5	8:40	8.3	1:59	0.9	2:14	0.7	5:10	8:08		25	Wed
26	Thu	9:11	7.7	9:30	8.8	2:55	0.4	3:06	0.5	5:09	8:09		26	Thu
27	Fri	10:04	8.0	10:18	9.3	3:47	-0.1	3:56	0.2	5:09	8:10		27	Fri
28	Sat	10:56	8.3	11:08	9.7	4:38	-0.6	4:47	0.0	5:08	8:11		28	Sat
29	Sun	11:48	8.5	11:58	10.0	5:29	-1.0	5:38	-0.2	5:07	8:12		29	Sun
30	Mon			12:41	8.7	6:20	-1.3	6:30	-0.4	5:07	8:13		30	Mon
31	Tue	12:51	10.1	1:34	8.8	7:12	-1.5	7:23	-0.4	5:06	8:14		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: (8423745)

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Is this week a spring tide or neap tide in Portsmouth, NH?

Portsmouth, NH is currently in a spring phase. Tonight's moon is 87% 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 Portsmouth, NH 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 Portsmouth, NH?

Tide predictions for Portsmouth, NH 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 Portsmouth, NH?

Tide data for Portsmouth, NH is sourced from NOAA Station #8423745. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8423745.

What is the moon phase in Portsmouth, NH tonight?

Tonight the moon over Portsmouth, NH is Waning Gibbous (87% illuminated). This places Portsmouth, NH 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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