Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

53°
H 56°
L 43°
NNE
11mph
Low tide
2:14 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Wednesday, October 21, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 3h 33m at 2:14 pm (1.5 ft)
Next high tide : 8:34 pm (7.6 ft)
Sunset today : 5:51 pm
Sunrise tomorrow : 7:04 am
Moon phase : Waxing Gibbous (78% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Nov 1914

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun10:118.310:397.73:550.84:240.36:164:36Full Moon1Sun
2Mon10:468.311:187.64:310.95:010.26:184:35Full Moon2Mon
3Tue11:208.311:557.55:041.05:370.26:194:33Full Moon3Tue
4Wed11:538.35:371.16:110.36:204:32Full Moon4Wed
5Thu12:317.412:278.26:121.36:460.46:224:31Waning Gibbous5Thu
6Fri1:077.21:038.16:471.47:240.56:234:30Waning Gibbous6Fri
7Sat1:457.01:427.97:261.58:050.76:244:28Waning Gibbous7Sat
8Sun2:276.82:267.88:091.68:520.86:254:27Waning Gibbous8Sun
9Mon3:156.83:167.78:581.79:420.86:274:26Third Quarter9Mon
10Tue4:076.84:127.79:531.610:350.86:284:25Third Quarter10Tue
11Wed5:017.05:117.710:511.511:300.66:294:24Third Quarter11Wed
12Thu5:567.46:127.911:531.16:314:23Third Quarter12Thu
13Fri6:517.97:148.112:250.412:550.66:324:22Waning Crescent13Fri
14Sat7:458.58:138.31:210.21:550.06:334:21Waning Crescent14Sat
15Sun8:369.19:098.62:14-0.12:51-0.76:344:20Waning Crescent15Sun
16Mon9:259.710:038.73:05-0.33:44-1.26:364:19New Moon16Mon
17Tue10:1510.010:568.83:56-0.54:36-1.56:374:18New Moon17Tue
18Wed11:0610.111:508.74:46-0.55:29-1.66:384:17New Moon18Wed
19Thu11:5810.15:38-0.46:22-1.56:404:16Waxing Crescent19Thu
20Fri12:438.512:519.86:31-0.17:15-1.26:414:16Waxing Crescent20Fri
21Sat1:388.31:469.47:250.28:11-0.76:424:15Waxing Crescent21Sat
22Sun2:367.92:458.98:230.69:11-0.26:434:14First Quarter22Sun
23Mon3:367.73:488.49:260.910:110.26:444:13First Quarter23Mon
24Tue4:387.54:517.910:311.111:110.56:464:13First Quarter24Tue
25Wed5:377.55:547.611:371.26:474:12First Quarter25Wed
26Thu6:347.66:567.312:080.812:411.26:484:12Waxing Gibbous26Thu
27Fri7:277.77:537.21:041.01:401.06:494:11Waxing Gibbous27Fri
28Sat8:157.98:457.21:551.12:320.76:504:10Waxing Gibbous28Sat
29Sun8:598.09:317.22:401.13:180.56:524:10Waxing Gibbous29Sun
30Mon9:388.110:147.33:211.23:590.36:534:10Waxing Gibbous30Mon
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8423745)

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The US Harbors tide chart design is protected by copyright. It may be printed for personal use only.
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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 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 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 Waxing Gibbous (78% illuminated). This places Portsmouth, NH 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

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