Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

83°
H 83°
L 57°
SSW
9mph
Low tide
3:34 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, August 24, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 32m at 3:34 pm (1.6 ft)
Next high tide : 9:55 pm (7.9 ft)
Sunset today : 7:31 pm
Sunrise tomorrow : 5:58 am
Moon phase : Waxing Gibbous (88% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Aug 1949

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon5:118.35:398.911:120.011:540.05:338:05First Quarter1Mon
2Tue6:137.96:378.812:090.45:348:03First Quarter2Tue
3Wed7:197.57:398.712:590.11:100.75:358:02Waxing Gibbous3Wed
4Thu8:277.48:428.72:070.22:150.95:368:01Waxing Gibbous4Thu
5Fri9:317.39:438.73:120.13:181.05:378:00Waxing Gibbous5Fri
6Sat10:297.410:388.84:110.04:150.95:387:58Waxing Gibbous6Sat
7Sun11:217.511:288.85:04-0.15:070.85:397:57Full Moon7Sun
8Mon12:097.65:52-0.15:550.85:407:56Full Moon8Mon
9Tue12:158.812:537.76:36-0.16:390.75:417:54Full Moon9Tue
10Wed12:588.71:327.87:150.07:200.75:437:53Full Moon10Wed
11Thu1:388.52:097.87:510.18:000.85:447:52Waning Gibbous11Thu
12Fri2:168.32:457.88:260.38:400.95:457:50Waning Gibbous12Fri
13Sat2:557.93:217.89:010.69:211.05:467:49Waning Gibbous13Sat
14Sun3:357.63:597.79:370.910:041.15:477:47Waning Gibbous14Sun
15Mon4:197.24:407.610:161.210:511.25:487:46Third Quarter15Mon
16Tue5:066.95:247.510:591.411:401.35:497:44Third Quarter16Tue
17Wed5:586.66:127.511:461.75:507:43Third Quarter17Wed
18Thu6:546.57:067.612:341.412:381.85:517:41Third Quarter18Thu
19Fri7:546.48:047.71:341.31:351.85:527:40Waning Crescent19Fri
20Sat8:546.69:028.12:351.02:351.65:537:38Waning Crescent20Sat
21Sun9:496.99:568.53:310.73:311.25:557:37Waning Crescent21Sun
22Mon10:397.410:479.04:210.24:230.75:567:35New Moon22Mon
23Tue11:277.911:379.35:09-0.35:140.25:577:33New Moon23Tue
24Wed12:138.45:55-0.76:05-0.25:587:32New Moon24Wed
25Thu12:279.61:008.86:41-1.06:55-0.65:597:30New Moon25Thu
26Fri1:169.61:469.27:27-1.17:47-0.86:007:28Waxing Crescent26Fri
27Sat2:069.52:339.48:13-1.08:39-0.86:017:27Waxing Crescent27Sat
28Sun2:589.13:239.39:02-0.79:34-0.76:027:25Waxing Crescent28Sun
29Mon3:548.74:179.29:53-0.210:34-0.46:037:23First Quarter29Mon
30Tue4:558.15:158.910:500.311:37-0.16:047:22First Quarter30Tue
31Wed5:597.76:178.611:500.76:067:20First Quarter31Wed
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 88% 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 (88% 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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