Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

67°
H 80°
L 59°
WSW
1mph
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 3h 21m 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 - May 1950

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon11:168.911:329.94:58-1.05:13-0.65:367:43Full Moon1Mon
2Tue12:099.05:49-1.46:02-0.65:357:44Full Moon2Tue
3Wed12:2110.11:028.96:41-1.66:52-0.55:347:45Full Moon3Wed
4Thu1:1110.11:558.77:33-1.67:44-0.25:327:46Waning Gibbous4Thu
5Fri2:039.92:508.48:27-1.38:380.25:317:47Waning Gibbous5Fri
6Sat2:589.53:498.09:24-0.89:360.65:307:49Waning Gibbous6Sat
7Sun3:589.04:527.710:25-0.310:401.05:287:50Third Quarter7Sun
8Mon5:028.55:577.511:290.111:471.25:277:51Third Quarter8Mon
9Tue6:098.17:007.512:320.45:267:52Third Quarter9Tue
10Wed7:157.88:007.512:561.31:350.65:257:53Third Quarter10Wed
11Thu8:197.68:557.72:031.22:320.85:247:54Waning Crescent11Thu
12Fri9:167.59:438.03:031.03:230.85:227:55Waning Crescent12Fri
13Sat10:077.510:258.13:550.74:070.95:217:56Waning Crescent13Sat
14Sun10:537.511:048.34:400.54:461.05:207:57Waning Crescent14Sun
15Mon11:357.511:408.35:210.35:231.15:197:58New Moon15Mon
16Tue12:157.45:590.25:581.25:187:59New Moon16Tue
17Wed12:158.412:547.46:350.26:331.35:178:01New Moon17Wed
18Thu12:498.31:317.37:100.27:081.45:168:02New Moon18Thu
19Fri1:248.32:077.27:460.37:441.45:158:03Waxing Crescent19Fri
20Sat2:008.22:457.18:230.48:231.55:148:04Waxing Crescent20Sat
21Sun2:398.13:267.09:030.59:051.65:138:05Waxing Crescent21Sun
22Mon3:218.14:117.09:470.59:531.65:138:06Waxing Crescent22Mon
23Tue4:098.04:597.110:340.510:451.55:128:07First Quarter23Tue
24Wed5:027.95:507.311:240.511:421.35:118:08First Quarter24Wed
25Thu5:587.96:427.712:150.45:108:08First Quarter25Thu
26Fri6:577.97:368.212:411.01:090.45:098:09Waxing Gibbous26Fri
27Sat7:598.08:308.71:430.62:050.25:098:10Waxing Gibbous27Sat
28Sun9:008.19:239.22:440.03:000.15:088:11Waxing Gibbous28Sun
29Mon9:598.310:159.73:42-0.53:53-0.15:078:12Waxing Gibbous29Mon
30Tue10:558.511:079.94:37-1.04:46-0.25:078:13Full Moon30Tue
31Wed11:518.55:31-1.35:39-0.25:068:14Full Moon31Wed
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 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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