Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

49°
H -°
L 44°
S
1mph
Low tide
12:56 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Sunday, September 20, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 20m at 12:56 am (1.4 ft)
Next high tide : 7:18 am (6.5 ft)
Sunset today : 6:44 pm
Sunrise tomorrow : 6:28 am
Moon phase : First Quarter (67% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Aug 1899

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue7:267.27:438.31:090.51:161.24:337:04Waning Crescent1Tue
2Wed8:267.28:398.32:110.52:161.24:347:03Waning Crescent2Wed
3Thu9:197.29:288.43:050.43:081.14:357:02Waning Crescent3Thu
4Fri10:067.310:138.43:520.33:541.04:367:01New Moon4Fri
5Sat10:497.510:558.54:350.24:360.94:377:00New Moon5Sat
6Sun11:287.611:338.45:130.25:150.94:386:58New Moon6Sun
7Mon12:047.75:470.25:520.84:396:57New Moon7Mon
8Tue12:098.412:377.86:190.26:280.84:406:56Waxing Crescent8Tue
9Wed12:448.21:107.96:500.37:030.74:416:54Waxing Crescent9Wed
10Thu1:198.11:427.97:230.47:410.74:436:53Waxing Crescent10Thu
11Fri1:557.82:178.07:570.68:210.84:446:51Waxing Crescent11Fri
12Sat2:357.62:558.08:350.79:050.84:456:50First Quarter12Sat
13Sun3:197.43:388.09:180.99:540.84:466:49First Quarter13Sun
14Mon4:087.14:288.110:051.010:480.84:476:47First Quarter14Mon
15Tue5:037.05:238.210:581.111:470.74:486:46First Quarter15Tue
16Wed6:047.06:238.411:561.04:496:44Waxing Gibbous16Wed
17Thu7:097.27:278.712:510.51:000.84:506:43Waxing Gibbous17Thu
18Fri8:137.58:299.11:540.12:040.54:516:41Waxing Gibbous18Fri
19Sat9:118.09:279.52:53-0.43:030.04:526:40Full Moon19Sat
20Sun10:068.610:239.83:47-0.84:00-0.54:536:38Full Moon20Sun
21Mon10:589.011:189.94:39-1.24:55-0.94:556:36Full Moon21Mon
22Tue11:499.45:29-1.35:50-1.14:566:35Full Moon22Tue
23Wed12:119.912:399.66:19-1.36:43-1.14:576:33Waning Gibbous23Wed
24Thu1:049.61:299.67:08-1.07:37-1.04:586:32Waning Gibbous24Thu
25Fri1:579.12:219.47:58-0.68:33-0.64:596:30Waning Gibbous25Fri
26Sat2:538.63:159.08:51-0.19:31-0.25:006:28Third Quarter26Sat
27Sun3:528.04:138.69:470.410:330.25:016:27Third Quarter27Sun
28Mon4:537.55:138.310:460.911:370.55:026:25Third Quarter28Mon
29Tue5:567.26:158.111:481.25:036:23Third Quarter29Tue
30Wed7:007.07:178.012:420.712:521.45:046:22Waning Crescent30Wed
31Thu7:597.18:148.01:440.81:531.35:066:20Waning Crescent31Thu
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 transitional phase. Tonight's moon is 67% 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 shifting between spring and neap.

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 First Quarter (67% illuminated). This places Portsmouth, NH in a transitional tide cycle, so tidal ranges are shifting between spring and neap 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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