Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

67°
H -°
L 63°
SSE
4mph
Low tide
3:35 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Sunday, August 23, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide (tomorrow) : in 4h 08m at 3:35 am (1.0 ft)
Next high tide (tomorrow) : 9:49 am (6.7 ft)
Sunset today : 7:33 pm
Sunrise tomorrow : 5:57 am
Moon phase : Waxing Gibbous (81% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Feb 1951

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu5:568.36:457.012:250.26:584:54Waning Crescent1Thu
2Fri7:038.57:577.112:350.81:360.06:574:55Waning Crescent2Fri
3Sat8:128.79:027.41:440.72:42-0.46:564:57Waning Crescent3Sat
4Sun9:149.010:017.82:490.43:41-0.76:554:58New Moon4Sun
5Mon10:129.310:548.13:480.14:35-1.06:544:59New Moon5Mon
6Tue11:069.411:448.44:43-0.25:25-1.16:535:01New Moon6Tue
7Wed11:579.45:36-0.46:12-1.16:515:02New Moon7Wed
8Thu12:318.512:459.26:25-0.56:56-0.96:505:03Waxing Crescent8Thu
9Fri1:158.51:318.87:13-0.47:39-0.56:495:05Waxing Crescent9Fri
10Sat1:598.42:188.28:01-0.18:220.06:485:06Waxing Crescent10Sat
11Sun2:438.23:077.78:500.29:060.56:465:07Waxing Crescent11Sun
12Mon3:287.93:597.19:420.59:531.06:455:09First Quarter12Mon
13Tue4:177.64:556.710:360.810:431.46:445:10First Quarter13Tue
14Wed5:097.45:546.411:351.111:391.86:425:11First Quarter14Wed
15Thu6:077.26:576.212:381.26:415:13First Quarter15Thu
16Fri7:087.27:586.312:411.91:421.16:395:14Waxing Gibbous16Fri
17Sat8:067.48:516.51:421.82:370.96:385:15Waxing Gibbous17Sat
18Sun8:577.69:386.82:361.63:230.66:375:17Waxing Gibbous18Sun
19Mon9:428.010:197.13:221.24:030.36:355:18Waxing Gibbous19Mon
20Tue10:238.210:567.54:030.94:390.06:345:19Full Moon20Tue
21Wed11:028.511:317.84:420.55:14-0.26:325:21Full Moon21Wed
22Thu11:398.65:200.25:48-0.46:315:22Full Moon22Thu
23Fri12:058.112:178.75:59-0.16:23-0.56:295:23Full Moon23Fri
24Sat12:408.412:568.66:39-0.36:59-0.46:275:24Waning Gibbous24Sat
25Sun1:168.61:388.47:22-0.47:39-0.36:265:26Waning Gibbous25Sun
26Mon1:568.72:248.18:08-0.48:240.06:245:27Waning Gibbous26Mon
27Tue2:428.73:167.79:00-0.39:140.36:235:28Third Quarter27Tue
28Wed3:348.64:167.39:57-0.110:100.76:215:29Third Quarter28Wed
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.
Any commercial use, modification, redistribution, or repackaging without written permission is strictly prohibited.

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 81% 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 Waxing Gibbous (81% 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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