Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

67°
H 80°
L 59°
SW
2mph
High tide
9:49 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, August 24, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide : 3:34 pm (1.6 ft)
Next high tide : in 1h 08m at 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 - Mar 1950

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed8:468.09:277.12:211.33:090.36:195:31Waxing Gibbous1Wed
2Thu9:348.410:107.63:110.83:52-0.26:175:32Waxing Gibbous2Thu
3Fri10:208.910:528.23:590.24:34-0.66:165:34Full Moon3Fri
4Sat11:069.211:348.74:45-0.35:16-0.96:145:35Full Moon4Sat
5Sun11:519.35:32-0.85:58-1.16:125:36Full Moon5Sun
6Mon12:169.112:389.36:19-1.16:41-1.16:115:37Waning Gibbous6Mon
7Tue12:599.41:269.07:07-1.27:26-0.86:095:38Waning Gibbous7Tue
8Wed1:459.42:178.67:58-1.18:15-0.46:075:40Waning Gibbous8Wed
9Thu2:349.23:138.18:53-0.89:080.16:065:41Third Quarter9Thu
10Fri3:308.94:167.69:53-0.410:070.66:045:42Third Quarter10Fri
11Sat4:328.55:257.110:590.011:131.06:025:43Third Quarter11Sat
12Sun5:418.16:387.012:120.36:005:45Third Quarter12Sun
13Mon6:558.07:497.012:261.21:260.45:595:46Waning Crescent13Mon
14Tue8:048.08:517.31:401.12:310.25:575:47Waning Crescent14Tue
15Wed9:048.29:437.62:430.93:250.15:555:48Waning Crescent15Wed
16Thu9:568.310:287.83:370.64:11-0.15:535:49New Moon16Thu
17Fri10:428.411:098.04:240.34:52-0.15:525:51New Moon17Fri
18Sat11:248.311:458.25:070.15:290.05:505:52New Moon18Sat
19Sun12:028.25:460.06:020.25:485:53New Moon19Sun
20Mon12:188.212:398.06:220.06:340.45:465:54Waxing Crescent20Mon
21Tue12:508.21:147.76:580.17:060.65:445:55Waxing Crescent21Tue
22Wed1:228.11:517.47:330.37:400.95:435:56Waxing Crescent22Wed
23Thu1:567.92:307.18:110.58:171.25:415:58Waxing Crescent23Thu
24Fri2:337.73:146.88:530.78:591.55:395:59Waxing Crescent24Fri
25Sat3:177.54:036.59:401.09:471.85:376:00First Quarter25Sat
26Sun4:077.34:586.310:341.210:411.95:366:01First Quarter26Sun
27Mon5:047.25:596.311:321.211:401.95:346:02First Quarter27Mon
28Tue6:067.37:016.512:351.15:326:03First Quarter28Tue
29Wed7:107.67:586.912:441.61:350.85:306:05Waxing Gibbous29Wed
30Thu8:098.08:487.51:461.22:270.35:286:06Waxing Gibbous30Thu
31Fri9:028.59:338.22:410.53:14-0.25:276:07Waxing Gibbous31Fri
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8423745)

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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 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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