Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

57°
H 62°
L 48°
NE
10mph
Low tide
2:58 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Tuesday, September 22, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 5h 16m at 2:58 pm (1.6 ft)
Next high tide : 9:18 pm (7.7 ft)
Sunset today : 6:40 pm
Sunrise tomorrow : 6:30 am
Moon phase : Waxing Gibbous (83% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Jun 1959

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon8:487.59:138.22:350.82:500.85:068:14Waning Crescent1Mon
2Tue9:417.59:598.33:290.73:390.95:058:15Waning Crescent2Tue
3Wed10:297.510:428.44:170.54:221.05:058:16Waning Crescent3Wed
4Thu11:147.511:218.55:000.35:021.05:048:17New Moon4Thu
5Fri11:557.611:598.55:400.25:401.05:048:18New Moon5Fri
6Sat12:357.66:170.16:171.05:048:18New Moon6Sat
7Sun12:368.51:137.66:530.16:531.05:038:19New Moon7Sun
8Mon1:118.51:507.67:280.17:301.05:038:20Waxing Crescent8Mon
9Tue1:478.52:267.68:040.18:081.15:038:20Waxing Crescent9Tue
10Wed2:248.43:047.68:410.18:501.05:038:21Waxing Crescent10Wed
11Thu3:048.43:457.79:220.19:351.05:038:21Waxing Crescent11Thu
12Fri3:498.34:307.810:060.110:250.95:028:22First Quarter12Fri
13Sat4:388.25:198.010:530.111:180.85:028:22First Quarter13Sat
14Sun5:328.16:108.311:440.15:028:23First Quarter14Sun
15Mon6:308.07:058.612:150.612:380.15:028:23First Quarter15Mon
16Tue7:328.08:029.01:160.31:350.15:028:24Waxing Gibbous16Tue
17Wed8:368.29:009.42:19-0.12:350.05:028:24Waxing Gibbous17Wed
18Thu9:388.49:579.73:20-0.53:33-0.25:028:24Waxing Gibbous18Thu
19Fri10:378.610:5210.04:18-1.04:29-0.45:028:25Full Moon19Fri
20Sat11:348.811:4710.25:14-1.35:25-0.55:038:25Full Moon20Sat
21Sun12:308.96:09-1.56:20-0.55:038:25Full Moon21Sun
22Mon12:4210.11:258.97:02-1.57:14-0.45:038:26Waning Gibbous22Mon
23Tue1:3610.02:188.87:55-1.38:09-0.25:038:26Waning Gibbous23Tue
24Wed2:299.63:118.78:47-1.09:040.15:048:26Waning Gibbous24Wed
25Thu3:239.24:058.59:39-0.610:010.45:048:26Waning Gibbous25Thu
26Fri4:198.75:008.310:33-0.210:590.65:048:26Third Quarter26Fri
27Sat5:168.25:548.211:260.211:580.85:058:26Third Quarter27Sat
28Sun6:137.76:478.112:190.65:058:26Third Quarter28Sun
29Mon7:117.47:408.012:581.01:120.95:058:26Third Quarter29Mon
30Tue8:097.28:328.01:571.02:061.15:068:26Waning Crescent30Tue
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 83% 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 (83% 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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