Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

61°
H -°
L 60°
SSW
4mph
Low tide
7:21 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Sunday, September 13, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 5h 40m at 7:21 am (-0.2 ft)
Next high tide : 1:39 pm (8.9 ft)
Sunset today : 6:57 pm
Sunrise tomorrow : 6:20 am
Moon phase : Waxing Crescent (7% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

Featured Local Businesses

Maritime Boats by Chislett Marine

Maritime Boats
Marine Supplies

Hamilton Marine - Kittery, ME
An aerial view of Safe Harbor Kittery Point

Safe Harbor Kittery Point
Great Bay Marine

Great Bay Marine

Portsmouth, NH Tides - Nov 2078

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue10:088.110:298.03:500.54:140.57:185:34Waning Crescent1Tue
2Wed10:498.211:137.94:320.54:580.37:195:33New Moon2Wed
3Thu11:268.411:537.85:100.65:380.27:205:32New Moon3Thu
4Fri12:018.45:460.76:150.17:225:30New Moon4Fri
5Sat12:327.712:358.46:190.96:500.27:235:29New Moon5Sat
6Sun1:097.612:088.35:521.16:250.26:244:28New Moon6Sun
7Mon12:457.412:418.26:261.27:000.46:264:27Waxing Crescent7Mon
8Tue1:227.21:178.07:021.47:380.56:274:26Waxing Crescent8Tue
9Wed2:017.01:567.97:421.68:200.76:284:25Waxing Crescent9Wed
10Thu2:446.82:417.78:251.79:070.86:294:23Waxing Crescent10Thu
11Fri3:336.73:337.69:151.89:590.96:314:22First Quarter11Fri
12Sat4:256.74:297.610:101.710:520.86:324:21First Quarter12Sat
13Sun5:206.95:287.711:091.611:470.76:334:20First Quarter13Sun
14Mon6:157.36:297.812:101.26:344:19Waxing Gibbous14Mon
15Tue7:097.97:298.112:430.51:110.66:364:19Waxing Gibbous15Tue
16Wed8:018.58:278.41:370.12:090.06:374:18Waxing Gibbous16Wed
17Thu8:509.19:218.72:29-0.23:03-0.76:384:17Waxing Gibbous17Thu
18Fri9:389.710:148.93:18-0.43:55-1.26:394:16Full Moon18Fri
19Sat10:2710.011:078.94:08-0.64:47-1.66:414:15Full Moon19Sat
20Sun11:1810.24:58-0.65:39-1.76:424:14Full Moon20Sun
21Mon12:008.912:0910.15:50-0.56:32-1.66:434:14Waning Gibbous21Mon
22Tue12:548.61:029.86:42-0.27:26-1.26:444:13Waning Gibbous22Tue
23Wed1:508.31:589.47:370.18:24-0.86:464:12Waning Gibbous23Wed
24Thu2:498.02:598.98:360.59:24-0.36:474:12Third Quarter24Thu
25Fri3:517.74:038.49:400.910:270.16:484:11Third Quarter25Fri
26Sat4:547.65:088.010:471.111:280.46:494:11Third Quarter26Sat
27Sun5:557.66:137.711:541.26:504:10Third Quarter27Sun
28Mon6:537.67:157.512:280.61:001.16:514:10Waning Crescent28Mon
29Tue7:477.88:117.41:240.81:580.96:524:09Waning Crescent29Tue
30Wed8:348.09:027.42:140.92:490.66:544:09Waning Crescent30Wed
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
Tidal Data Source: (8423745)

www.USHarbors.com

© 2026 US Harbors LLC All rights reserved

The US Harbors tide chart design is protected by copyright. It may be printed for personal use only.
Any commercial use, modification, redistribution, or repackaging without written permission is strictly prohibited.

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 7% 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 (7% 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

Coastal Stories See All

Image Credits: Flickr.com.

Concrete Ships Hiding in Plain Sight: The Forgotten Breakwaters of America's Harbors

By Jordan Hanssen, best4boats. There's a good chance a concrete ship is lurking in your… More

Maritime History

Image Credits: Flickr.com.

Is Offshore Construction Noise Stressing New England's Lobsters? WHOI Scientists Want to Know

By Kiran Johnson, whoi.edu. As offshore wind farms multiply along the New England coast, a… More

Coastal LifeOcean AwarenessOcean Science

The future of fisheries-independent surveys will include traditional capture-based surveys as well as advanced technology such as acoustic, optical, and molecular tools deployed from survey vessels, uncrewed vehicles, and moored to the seafloor. Credit: NOAA Fisheries/Su Kim

Charting the Future of Fisheries-Independent Surveys

By fisheries.noaa.gov, fisheries.noaa.gov. Fisheries-independent surveys operate on dedicated survey vessels and are the foundation of… More

Ocean Science

Coastally-trapped Kelvin waves, a signature of El Niño, traveled north along the West Coast during the 1997/1998 El Niño, as shown in a map of sea surface height anomalies. Darker reds show sea levels higher than normal, while darker blues show heights below normal. Scientists are now watching for similar waves to move up the West Coast this fall. Credit: Dillon Amaya/North Carolina State University

Ocean Indicators We’re Tracking for El Niño’s Arrival on the West Coast

By fisheries.noaa.gov, fisheries.noaa.gov. Has El Niño reached the West Coast? You might think it has.… More

Coastal NewsExtreme WeatherOcean ScienceWeather & Tides

Docked fishing boats at Yaquina Bay, Newport, Oregon. Credit: iStock

Advancing Agency-Level Reforms to Restore American Seafood Competitiveness

By fisheries.noaa.gov, fisheries.noaa.gov. Over the past year, I have met with fishermen, processors, coastal community… More

Coastal NewsFishingFood

Image Credits: Wikimedia commons.

Coral IVF: How Scientists Are Breeding Heat-Resistant Reefs for Florida's Future

By Dawn Anderson, best4boats.com. The reefs that protect South Florida's coastlines, harbors, and marinas are… More

Ocean Science

The Sacramento River near the main spawning area of winter-run Chinook salmon blocked by dams from their original mountain spawning habitat. The Sundial Bridge in Redding rises in the background. Credit: Larisa Thacher/UC Davis Center for Watershed Sciences

A Secret to Survival for California’s Most Endangered Salmon

By fisheries.noaa.gov, fisheries.noaa.gov. Traditional field research combined with new technology has revealed a secret to… More

Coastal NewsEnvironment

A group of melon-headed whales swimming together on February 1, 2026, seen during the Winter Hawaiian Islands Cetacean and Ecosystem Assessment Survey. Credit: NOAA Fisheries/Mary Applegate, taken under NOAA permit

A Winter at Sea Reveals Seasonal Habits of Whales, Dolphins, and Seabirds in Hawaiʻi

By fisheries.noaa.gov, fisheries.noaa.gov. The Hawaiian archipelago is teeming with marine life, and winter brings some… More

Ocean Science

NOAA Autonomous Surface Vehicle in Narragansett Bay during testing. Goat Island and the Newport Bridge in the background.

Beyond Ocean Mapping: Using Uncrewed Vehicles to Advance Ocean Research

By fisheries.noaa.gov, fisheries.noaa.gov. It’s January off of Nantucket Shoals. An uncrewed surface vehicle begins a… More

Ocean Science

Your Privacy Choices