Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

66°
H 72°
L 48°
W
6mph
Low tide
8:02 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, September 14, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 3h 56m at 8:02 am (0.2 ft)
Next high tide : 2:20 pm (8.7 ft)
Sunset today : 6:55 pm
Sunrise tomorrow : 6:21 am
Moon phase : Waxing Crescent (14% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Feb 1971

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon3:109.03:408.39:20-0.69:40-0.26:584:54First Quarter1Mon
2Tue4:068.74:437.710:22-0.210:380.36:574:55First Quarter2Tue
3Wed5:068.55:507.211:280.111:400.86:564:57First Quarter3Wed
4Thu6:108.27:007.012:380.36:554:58Waxing Gibbous4Thu
5Fri7:178.18:076.912:491.11:480.36:544:59Waxing Gibbous5Fri
6Sat8:218.19:077.01:561.12:490.26:525:01Waxing Gibbous6Sat
7Sun9:178.29:587.22:551.03:420.06:515:02Waxing Gibbous7Sun
8Mon10:068.310:437.43:460.84:28-0.16:505:04Full Moon8Mon
9Tue10:518.411:247.54:320.75:08-0.16:495:05Full Moon9Tue
10Wed11:308.45:130.55:45-0.16:475:06Full Moon10Wed
11Thu12:007.712:078.35:510.56:170.06:465:08Full Moon11Thu
12Fri12:347.712:428.16:260.46:480.16:455:09Waning Gibbous12Fri
13Sat1:067.81:177.97:010.57:190.36:435:10Waning Gibbous13Sat
14Sun1:377.81:527.67:370.57:520.56:425:11Waning Gibbous14Sun
15Mon2:107.72:307.38:150.68:270.86:415:13Waning Gibbous15Mon
16Tue2:467.63:126.98:570.89:071.16:395:14Third Quarter16Tue
17Wed3:277.64:006.69:440.99:531.36:385:15Third Quarter17Wed
18Thu4:147.54:546.410:361.010:441.56:365:17Third Quarter18Thu
19Fri5:087.55:556.311:341.011:421.56:355:18Third Quarter19Fri
20Sat6:097.67:016.412:390.96:335:19Waning Crescent20Sat
21Sun7:147.98:056.812:461.41:440.56:325:21Waning Crescent21Sun
22Mon8:168.49:017.31:501.02:420.06:305:22Waning Crescent22Mon
23Tue9:138.99:528.02:490.43:34-0.66:295:23Waning Crescent23Tue
24Wed10:069.310:418.63:44-0.24:22-1.16:275:25New Moon24Wed
25Thu10:589.711:299.14:36-0.85:10-1.46:265:26New Moon25Thu
26Fri11:489.85:28-1.25:56-1.56:245:27New Moon26Fri
27Sat12:169.512:399.66:19-1.46:43-1.46:225:28Waxing Crescent27Sat
28Sun1:039.61:309.37:10-1.57:31-1.06:215:30Waxing Crescent28Sun
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 14% 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 Crescent (14% 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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