Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

53°
H 65°
L 46°
N
6mph
Low tide
12:01 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Saturday, September 19, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 3h 42m at 12:01 pm (2.0 ft)
Next high tide : 6:27 pm (7.3 ft)
Sunset today : 6:46 pm
Sunrise tomorrow : 6:27 am
Moon phase : First Quarter (58% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Jan 1901

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue7:418.98:237.81:120.22:04-0.47:144:18Waxing Gibbous1Tue
2Wed8:409.19:228.02:150.23:03-0.77:144:19Waxing Gibbous2Wed
3Thu9:369.310:178.13:120.13:58-0.97:144:20Full Moon3Thu
4Fri10:289.411:088.24:06-0.14:49-1.07:144:21Full Moon4Fri
5Sat11:189.311:568.34:57-0.15:37-1.07:144:22Full Moon5Sat
6Sun12:059.25:45-0.16:22-0.87:144:23Full Moon6Sun
7Mon12:418.212:508.96:310.17:05-0.67:144:24Waning Gibbous7Mon
8Tue1:258.11:348.67:170.27:46-0.37:144:25Waning Gibbous8Tue
9Wed2:078.02:188.18:020.58:280.17:144:26Waning Gibbous9Wed
10Thu2:517.83:057.78:490.79:110.57:134:27Waning Gibbous10Thu
11Fri3:367.63:547.39:390.99:560.87:134:28Third Quarter11Fri
12Sat4:247.54:476.910:311.110:441.17:134:29Third Quarter12Sat
13Sun5:137.45:426.711:251.211:341.37:124:30Third Quarter13Sun
14Mon6:057.46:416.512:231.27:124:31Third Quarter14Mon
15Tue6:597.57:406.612:291.41:221.17:124:33Waning Crescent15Tue
16Wed7:527.78:336.81:241.42:160.87:114:34Waning Crescent16Wed
17Thu8:418.09:217.02:161.23:030.47:114:35Waning Crescent17Thu
18Fri9:268.310:057.43:030.93:460.07:104:36Waning Crescent18Fri
19Sat10:108.710:477.73:480.64:28-0.47:094:37New Moon19Sat
20Sun10:539.011:288.14:320.25:09-0.77:094:39New Moon20Sun
21Mon11:369.25:16-0.15:50-1.07:084:40New Moon21Mon
22Tue12:108.412:209.36:01-0.46:33-1.17:074:41Waxing Crescent22Tue
23Wed12:528.71:069.36:48-0.67:17-1.17:074:42Waxing Crescent23Wed
24Thu1:378.81:549.17:37-0.78:03-1.07:064:44Waxing Crescent24Thu
25Fri2:258.92:478.78:30-0.68:53-0.77:054:45First Quarter25Fri
26Sat3:178.93:458.39:27-0.49:48-0.37:044:46First Quarter26Sat
27Sun4:148.74:487.910:29-0.210:470.17:034:48First Quarter27Sun
28Mon5:158.65:567.511:34-0.111:500.47:024:49First Quarter28Mon
29Tue6:218.57:067.412:440.07:014:50Waxing Gibbous29Tue
30Wed7:288.58:137.512:580.51:53-0.17:004:52Waxing Gibbous30Wed
31Thu8:318.79:137.62:050.52:55-0.36:594:53Waxing Gibbous31Thu
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 neap phase. Tonight's moon is 58% 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 minimum.

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 (58% illuminated). This places Portsmouth, NH in a neap tide cycle, so tidal ranges are near their weekly minimum 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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