Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

47°
H -°
L 32°
NW
14mph
Low tide
11:13 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Saturday, October 17, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 5h 22m at 11:13 pm (1.2 ft)
Next high tide (tomorrow) : 5:39 am (6.6 ft)
Sunset today : 5:57 pm
Sunrise tomorrow : 6:59 am
Moon phase : First Quarter (41% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Nov 1919

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sat4:577.05:077.610:471.511:210.96:164:36First Quarter1Sat
2Sun5:497.36:047.611:441.36:174:35First Quarter2Sun
3Mon6:427.77:027.812:150.712:430.96:194:34Waxing Gibbous3Mon
4Tue7:348.27:598.11:090.51:410.46:204:32Waxing Gibbous4Tue
5Wed8:238.88:528.52:010.22:34-0.36:214:31Waxing Gibbous5Wed
6Thu9:129.39:448.82:51-0.23:26-0.96:234:30Full Moon6Thu
7Fri10:009.810:369.03:40-0.54:17-1.36:244:29Full Moon7Fri
8Sat10:4910.111:289.14:30-0.75:08-1.66:254:27Full Moon8Sat
9Sun11:4010.25:20-0.76:00-1.76:264:26Waning Gibbous9Sun
10Mon12:219.012:3310.16:13-0.66:53-1.56:284:25Waning Gibbous10Mon
11Tue1:158.81:279.87:06-0.47:48-1.26:294:24Waning Gibbous11Tue
12Wed2:128.62:269.48:04-0.18:47-0.86:304:23Waning Gibbous12Wed
13Thu3:138.33:298.99:050.39:49-0.46:324:22Third Quarter13Thu
14Fri4:168.14:348.510:110.510:510.06:334:21Third Quarter14Fri
15Sat5:198.05:408.111:190.711:540.36:344:20Third Quarter15Sat
16Sun6:208.06:457.912:270.76:354:19Waning Crescent16Sun
17Mon7:198.17:477.812:550.51:300.66:374:18Waning Crescent17Mon
18Tue8:128.28:417.71:510.62:270.46:384:17Waning Crescent18Tue
19Wed8:598.49:307.72:410.73:160.26:394:16Waning Crescent19Wed
20Thu9:428.510:157.73:250.74:000.16:414:16New Moon20Thu
21Fri10:228.510:567.74:050.84:400.06:424:15New Moon21Fri
22Sat10:598.511:357.64:430.85:180.06:434:14New Moon22Sat
23Sun11:358.55:190.95:530.06:444:13New Moon23Sun
24Mon12:127.512:118.45:541.06:280.16:454:13New Moon24Mon
25Tue12:497.412:478.36:301.17:040.26:474:12Waxing Crescent25Tue
26Wed1:257.31:238.27:071.17:410.36:484:12Waxing Crescent26Wed
27Thu2:037.32:038.07:471.28:210.46:494:11Waxing Crescent27Thu
28Fri2:447.22:467.98:321.39:040.56:504:11Waxing Crescent28Fri
29Sat3:297.33:357.79:201.39:510.56:514:10First Quarter29Sat
30Sun4:177.44:287.710:131.210:400.56:524:10First Quarter30Sun
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.
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 neap phase. Tonight's moon is 41% 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 (41% 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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