Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

74°
H 75°
L 50°
WNW
12mph
Low tide
6:13 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Friday, September 11, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 3h 16m at 6:13 pm (-0.4 ft)
Next high tide (tomorrow) : 12:33 am (9.1 ft)
Sunset today : 7:00 pm
Sunrise tomorrow : 6:18 am
Moon phase : New Moon (0% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Jan 2076

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed6:167.86:467.212:290.87:144:18Waning Crescent1Wed
2Thu7:108.27:477.412:440.71:290.37:144:19Waning Crescent2Thu
3Fri8:048.68:447.61:400.52:26-0.27:144:20Waning Crescent3Fri
4Sat8:579.19:408.02:350.23:21-0.87:144:21Waning Crescent4Sat
5Sun9:509.610:348.23:29-0.14:14-1.27:144:22New Moon5Sun
6Mon10:439.911:278.54:22-0.35:07-1.57:144:23New Moon6Mon
7Tue11:3710.05:16-0.56:00-1.67:144:24New Moon7Tue
8Wed12:218.612:3110.06:10-0.66:52-1.67:134:25Waxing Crescent8Wed
9Thu1:148.71:269.87:05-0.67:45-1.47:134:26Waxing Crescent9Thu
10Fri2:088.62:229.38:01-0.48:39-1.07:134:27Waxing Crescent10Fri
11Sat3:058.53:228.89:01-0.19:36-0.67:124:28First Quarter11Sat
12Sun4:038.44:248.310:040.110:33-0.17:124:29First Quarter12Sun
13Mon5:018.35:287.811:090.311:320.37:124:30First Quarter13Mon
14Tue6:008.16:327.412:150.47:114:32First Quarter14Tue
15Wed6:598.17:367.212:320.71:200.47:114:33Waxing Gibbous15Wed
16Thu7:568.18:357.11:320.92:190.37:104:34Waxing Gibbous16Thu
17Fri8:478.19:267.22:271.03:110.27:104:35Waxing Gibbous17Fri
18Sat9:348.210:137.23:161.03:580.07:094:36Waxing Gibbous18Sat
19Sun10:188.310:557.34:000.94:400.07:094:38Full Moon19Sun
20Mon10:588.311:357.44:400.95:18-0.17:084:39Full Moon20Mon
21Tue11:368.45:180.85:54-0.17:074:40Full Moon21Tue
22Wed12:117.412:128.35:530.86:28-0.17:064:41Full Moon22Wed
23Thu12:467.412:468.36:290.87:000.07:064:43Waning Gibbous23Thu
24Fri1:207.41:218.17:050.87:340.17:054:44Waning Gibbous24Fri
25Sat1:537.41:588.07:420.88:090.27:044:45Waning Gibbous25Sat
26Sun2:297.52:387.78:230.88:480.37:034:47Waning Gibbous26Sun
27Mon3:087.53:227.59:090.89:300.57:024:48Third Quarter27Mon
28Tue3:517.64:137.39:580.810:170.67:014:49Third Quarter28Tue
29Wed4:397.85:087.110:530.711:090.77:004:51Third Quarter29Wed
30Thu5:338.06:107.111:530.56:594:52Third Quarter30Thu
31Fri6:328.27:177.112:070.812:570.26:584:53Waning Crescent31Fri
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 0% 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 New Moon (0% 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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