Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

77°
H 78°
L 58°
SSW
7mph
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 3h 00m 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 - Oct 1949

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat6:597.27:158.012:360.612:511.45:405:25Waxing Gibbous1Sat
2Sun8:017.38:158.11:410.61:551.25:415:23Waxing Gibbous2Sun
3Mon8:537.59:078.12:360.52:501.05:425:21Waxing Gibbous3Mon
4Tue9:387.89:528.23:230.43:370.75:435:19Waxing Gibbous4Tue
5Wed10:188.010:348.24:030.44:180.55:445:18Full Moon5Wed
6Thu10:548.111:128.14:380.44:570.45:455:16Full Moon6Thu
7Fri11:278.211:487.95:110.55:320.35:475:14Full Moon7Fri
8Sat11:588.25:420.76:060.35:485:12Full Moon8Sat
9Sun12:237.812:298.26:130.96:400.45:495:11Waning Gibbous9Sun
10Mon12:587.51:018.16:461.17:150.55:505:09Waning Gibbous10Mon
11Tue1:347.31:358.07:211.37:540.75:515:07Waning Gibbous11Tue
12Wed2:137.02:157.87:591.58:370.85:525:06Waning Gibbous12Wed
13Thu2:586.83:017.78:441.79:271.05:545:04Third Quarter13Thu
14Fri3:496.63:557.79:351.810:231.05:555:02Third Quarter14Fri
15Sat4:476.64:557.710:321.811:221.05:565:01Third Quarter15Sat
16Sun5:476.85:587.911:341.65:574:59Third Quarter16Sun
17Mon6:497.17:038.212:240.712:391.25:584:57Waning Crescent17Mon
18Tue7:467.78:048.51:230.41:420.66:004:56Waning Crescent18Tue
19Wed8:388.49:008.92:18-0.12:40-0.16:014:54Waning Crescent19Wed
20Thu9:279.19:539.23:08-0.53:34-0.76:024:53New Moon20Thu
21Fri10:159.610:459.33:56-0.74:25-1.26:034:51New Moon21Fri
22Sat11:0310.011:379.34:44-0.85:17-1.56:054:50New Moon22Sat
23Sun11:5110.15:32-0.76:09-1.66:064:48Waxing Crescent23Sun
24Mon12:309.112:4110.06:22-0.57:01-1.46:074:47Waxing Crescent24Mon
25Tue1:238.71:329.67:13-0.17:55-1.06:084:45Waxing Crescent25Tue
26Wed2:198.22:289.18:080.48:54-0.46:104:44Waxing Crescent26Wed
27Thu3:207.83:308.69:070.99:580.16:114:42First Quarter27Thu
28Fri4:247.44:368.210:121.211:030.46:124:41First Quarter28Fri
29Sat5:297.25:437.911:201.46:134:39First Quarter29Sat
30Sun6:327.26:477.712:080.712:281.46:154:38Waxing Gibbous30Sun
31Mon7:307.47:477.71:090.81:311.36:164:37Waxing Gibbous31Mon
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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