Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

77°
H 78°
L 47°
NW
10mph
High tide
5:29 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Friday, September 18, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide : 11:55 pm (1.3 ft)
Next high tide : in 2h 01m at 5:29 pm (7.5 ft)
Sunset today : 6:47 pm
Sunrise tomorrow : 6:26 am
Moon phase : First Quarter (48% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Sep 1964

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue7:257.57:458.71:030.11:170.76:077:18Waning Crescent1Tue
2Wed8:347.68:528.92:120.02:250.66:087:16Waning Crescent2Wed
3Thu9:387.89:549.13:18-0.23:290.46:097:14Waning Crescent3Thu
4Fri10:368.110:519.34:16-0.54:280.16:107:12New Moon4Fri
5Sat11:298.411:449.45:10-0.75:22-0.26:117:11New Moon5Sat
6Sun12:188.65:59-0.86:13-0.36:137:09New Moon6Sun
7Mon12:359.41:048.86:46-0.77:02-0.36:147:07New Moon7Mon
8Tue1:229.11:488.77:30-0.57:49-0.26:157:05Waxing Crescent8Tue
9Wed2:088.82:308.68:12-0.18:350.06:167:04Waxing Crescent9Wed
10Thu2:548.33:138.48:540.39:220.36:177:02Waxing Crescent10Thu
11Fri3:417.93:578.19:370.710:110.66:187:00Waxing Crescent11Fri
12Sat4:317.44:457.810:241.211:030.96:196:58First Quarter12Sat
13Sun5:247.05:377.611:131.511:581.26:206:56First Quarter13Sun
14Mon6:206.86:327.412:071.86:216:55First Quarter14Mon
15Tue7:196.67:307.412:571.31:051.96:226:53First Quarter15Tue
16Wed8:186.78:287.51:571.32:041.86:236:51Waxing Gibbous16Wed
17Thu9:126.99:217.82:541.13:001.66:256:49Waxing Gibbous17Thu
18Fri9:597.210:088.13:420.83:471.26:266:47Waxing Gibbous18Fri
19Sat10:417.510:508.44:240.54:300.96:276:46Waxing Gibbous19Sat
20Sun11:207.911:318.65:020.25:110.56:286:44Full Moon20Sun
21Mon11:588.35:39-0.15:520.16:296:42Full Moon21Mon
22Tue12:118.812:358.66:16-0.36:34-0.26:306:40Full Moon22Tue
23Wed12:528.91:138.96:55-0.47:17-0.56:316:38Waning Gibbous23Wed
24Thu1:358.91:539.17:35-0.48:01-0.66:326:37Waning Gibbous24Thu
25Fri2:198.72:369.28:19-0.28:50-0.66:336:35Waning Gibbous25Fri
26Sat3:088.53:249.19:060.09:43-0.46:346:33Waning Gibbous26Sat
27Sun4:038.14:198.99:580.310:41-0.26:366:31Third Quarter27Sun
28Mon5:047.85:208.710:570.611:450.06:376:29Third Quarter28Mon
29Tue6:107.66:278.612:010.86:386:28Third Quarter29Tue
30Wed7:197.57:378.512:520.11:100.96:396:26Waning Crescent30Wed
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 neap phase. Tonight's moon is 48% 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 (48% 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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