Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

67°
H -°
L 64°
SSE
3mph
Low tide
3:35 am
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 2h 40m at 3:35 am (1.0 ft)
Next high tide : 9:49 am (6.7 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 - Dec 1950

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Fri3:406.93:427.69:251.610:030.76:544:09Third Quarter1Fri
2Sat4:297.14:367.610:191.510:520.76:554:09Third Quarter2Sat
3Sun5:197.45:337.611:171.211:440.66:564:09Third Quarter3Sun
4Mon6:117.86:337.612:170.86:574:08Waning Crescent4Mon
5Tue7:038.37:347.812:380.41:170.36:584:08Waning Crescent5Tue
6Wed7:568.98:328.01:330.32:15-0.36:594:08Waning Crescent6Wed
7Thu8:489.49:288.32:260.03:09-0.97:004:08Waning Crescent7Thu
8Fri9:399.810:228.43:19-0.24:03-1.37:014:08New Moon8Fri
9Sat10:3110.011:178.54:11-0.34:56-1.57:024:08New Moon9Sat
10Sun11:2510.15:04-0.35:50-1.57:034:08New Moon10Sun
11Mon12:118.512:199.95:58-0.36:44-1.47:044:08Waxing Crescent11Mon
12Tue1:058.31:149.66:52-0.17:38-1.17:054:08Waxing Crescent12Tue
13Wed2:018.22:119.27:490.28:34-0.77:054:08Waxing Crescent13Wed
14Thu2:598.03:118.78:490.59:32-0.27:064:08First Quarter14Thu
15Fri3:587.84:138.19:530.710:300.27:074:08First Quarter15Fri
16Sat4:577.75:157.710:580.911:260.67:084:09First Quarter16Sat
17Sun5:547.76:187.312:021.07:084:09First Quarter17Sun
18Mon6:507.77:207.112:230.91:060.97:094:09Waxing Gibbous18Mon
19Tue7:427.88:177.01:191.12:040.77:104:10Waxing Gibbous19Tue
20Wed8:317.99:087.02:101.32:550.57:104:10Waxing Gibbous20Wed
21Thu9:158.09:557.02:571.33:400.47:114:10Waxing Gibbous21Thu
22Fri9:578.110:387.13:391.34:220.37:114:11Full Moon22Fri
23Sat10:368.211:187.14:191.35:000.27:124:11Full Moon23Sat
24Sun11:158.211:567.14:561.25:380.17:124:12Full Moon24Sun
25Mon11:528.25:331.26:130.17:134:13Full Moon25Mon
26Tue12:337.112:288.36:101.26:480.17:134:13Waning Gibbous26Tue
27Wed1:097.11:058.26:471.17:240.17:134:14Waning Gibbous27Wed
28Thu1:457.21:438.17:271.18:020.27:134:15Waning Gibbous28Thu
29Fri2:237.32:258.08:101.18:430.27:144:15Waning Gibbous29Fri
30Sat3:057.43:127.98:581.09:270.27:144:16Third Quarter30Sat
31Sun3:507.64:047.79:500.910:090.37:144:17Third Quarter31Sun
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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