Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

73°
H -°
L 49°
WNW
12mph
High tide
12:33 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Friday, September 11, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide (tomorrow) : 6:39 am (-0.5 ft)
Next high tide (tomorrow) : in 6h 00m at 12:33 am (9.1 ft)
Sunset today : 7:00 pm
Sunrise tomorrow : 6:18 am
Moon phase : New Moon (0% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Aug 1975

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri6:236.96:437.812:071.212:141.35:338:05Third Quarter1Fri
2Sat7:196.87:378.01:021.11:081.35:348:04Waning Crescent2Sat
3Sun8:196.98:348.32:010.92:051.25:358:03Waning Crescent3Sun
4Mon9:167.29:298.72:580.63:030.95:368:01Waning Crescent4Mon
5Tue10:097.610:219.13:520.13:570.55:378:00Waning Crescent5Tue
6Wed11:008.011:139.54:42-0.44:500.05:387:59New Moon6Wed
7Thu11:508.55:31-0.85:42-0.45:397:57New Moon7Thu
8Fri12:049.812:399.06:19-1.16:34-0.75:407:56New Moon8Fri
9Sat12:559.91:289.37:07-1.37:27-0.95:417:55Waxing Crescent9Sat
10Sun1:479.82:179.57:56-1.38:20-0.95:427:53Waxing Crescent10Sun
11Mon2:409.53:099.58:46-1.19:15-0.85:437:52Waxing Crescent11Mon
12Tue3:359.14:039.49:38-0.710:14-0.65:447:51First Quarter12Tue
13Wed4:358.65:019.110:34-0.311:16-0.35:467:49First Quarter13Wed
14Thu5:378.16:028.911:330.25:477:48First Quarter14Thu
15Fri6:427.77:058.612:210.012:350.65:487:46First Quarter15Fri
16Sat7:497.58:098.51:280.21:410.85:497:45Waxing Gibbous16Sat
17Sun8:537.49:108.52:350.32:460.95:507:43Waxing Gibbous17Sun
18Mon9:517.510:058.53:350.23:430.85:517:42Waxing Gibbous18Mon
19Tue10:427.610:548.64:260.24:340.75:527:40Waxing Gibbous19Tue
20Wed11:277.811:388.65:120.15:190.65:537:39Full Moon20Wed
21Thu12:087.95:530.16:010.65:547:37Full Moon21Thu
22Fri12:188.512:468.06:300.16:400.55:557:35Full Moon22Fri
23Sat12:568.41:218.07:030.27:160.55:577:34Full Moon23Sat
24Sun1:338.31:548.17:360.37:520.65:587:32Waning Gibbous24Sun
25Mon2:088.02:278.08:080.58:280.65:597:31Waning Gibbous25Mon
26Tue2:447.83:028.08:420.79:070.76:007:29Waning Gibbous26Tue
27Wed3:237.53:397.99:190.99:490.86:017:27Waning Gibbous27Wed
28Thu4:057.34:227.810:011.110:360.96:027:26Third Quarter28Thu
29Fri4:537.15:097.810:471.211:271.06:037:24Third Quarter29Fri
30Sat5:456.96:027.911:371.36:047:22Third Quarter30Sat
31Sun6:426.96:598.012:231.012:331.36:057:21Third Quarter31Sun
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8423745)

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Common Questions About Portsmouth, NH Tides

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

Portsmouth, NH is currently in a spring phase. Tonight's moon is 0% 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 New Moon (0% 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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