Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

48°
H 51°
L 32°
NW
13mph
High tide
4:47 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Saturday, October 17, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide : 11:13 pm (1.2 ft)
Next high tide : in 6h 09m at 4:47 pm (7.5 ft)
Sunset today : 5:57 pm
Sunrise tomorrow : 6:59 am
Moon phase : First Quarter (41% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Oct 1848

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun1:297.81:388.17:220.87:490.55:445:28Waxing Crescent1Sun
2Mon2:097.62:178.08:001.08:300.75:455:26Waxing Crescent2Mon
3Tue2:527.33:007.88:421.39:160.95:465:24First Quarter3Tue
4Wed3:397.13:487.69:281.510:061.05:485:23First Quarter4Wed
5Thu4:316.94:417.510:191.610:581.15:495:21First Quarter5Thu
6Fri5:256.95:377.611:141.611:541.05:505:19First Quarter6Fri
7Sat6:217.16:357.812:111.45:515:17Waxing Gibbous7Sat
8Sun7:167.47:328.112:510.81:101.05:525:16Waxing Gibbous8Sun
9Mon8:087.98:268.51:450.42:060.55:535:14Waxing Gibbous9Mon
10Tue8:568.49:178.92:350.02:57-0.15:555:12Waxing Gibbous10Tue
11Wed9:429.010:069.23:23-0.43:47-0.75:565:11Full Moon11Wed
12Thu10:299.510:569.44:09-0.84:36-1.25:575:09Full Moon12Thu
13Fri11:169.911:479.54:57-1.05:27-1.55:585:07Full Moon13Fri
14Sat12:0510.15:45-1.06:18-1.65:595:06Waning Gibbous14Sat
15Sun12:389.412:5510.06:35-0.97:10-1.56:015:04Waning Gibbous15Sun
16Mon1:329.11:489.87:27-0.68:06-1.26:025:02Waning Gibbous16Mon
17Tue2:298.82:469.48:23-0.29:05-0.86:035:01Third Quarter17Tue
18Wed3:318.43:499.09:250.210:09-0.46:044:59Third Quarter18Wed
19Thu4:368.14:558.610:300.511:150.06:054:57Third Quarter19Thu
20Fri5:427.96:038.411:390.76:074:56Third Quarter20Fri
21Sat6:477.97:098.212:210.212:470.76:084:54Waning Crescent21Sat
22Sun7:478.08:098.21:250.31:510.66:094:53Waning Crescent22Sun
23Mon8:408.29:028.22:210.22:460.46:104:51Waning Crescent23Mon
24Tue9:278.49:508.23:090.23:340.26:124:50Waning Crescent24Tue
25Wed10:098.510:338.23:520.34:170.16:134:48New Moon25Wed
26Thu10:478.511:138.14:310.44:570.06:144:47New Moon26Thu
27Fri11:238.511:518.05:070.55:340.06:154:45New Moon27Fri
28Sat11:588.55:420.66:090.16:174:44New Moon28Sat
29Sun12:287.912:328.46:160.86:440.26:184:43Waxing Crescent29Sun
30Mon1:047.71:068.26:510.97:200.36:194:41Waxing Crescent30Mon
31Tue1:427.51:438.17:281.17:590.56:214:40Waxing Crescent31Tue
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 neap phase. Tonight's moon is 41% 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 minimum.

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 First Quarter (41% illuminated). This places Portsmouth, NH in a neap tide cycle, so tidal ranges are near their weekly minimum 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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