Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

46°
H -°
L 44°
WSW
1mph
High tide
7:18 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Sunday, September 20, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide : 1:01 pm (2.0 ft)
Next high tide : in 4h 59m at 7:18 am (6.5 ft)
Sunset today : 6:44 pm
Sunrise tomorrow : 6:28 am
Moon phase : First Quarter (67% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Jun 1899

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu4:518.55:328.511:02-0.211:370.44:057:15Third Quarter1Thu
2Fri5:568.26:328.712:010.14:057:16Waning Crescent2Fri
3Sat7:018.07:308.812:440.31:020.34:057:16Waning Crescent3Sat
4Sun8:057.98:258.91:480.12:000.54:047:17Waning Crescent4Sun
5Mon9:037.89:179.02:46-0.12:540.64:047:18Waning Crescent5Mon
6Tue9:567.810:059.03:39-0.33:440.64:037:18New Moon6Tue
7Wed10:467.810:509.04:28-0.34:300.74:037:19New Moon7Wed
8Thu11:327.711:348.95:14-0.35:150.84:037:20New Moon8Thu
9Fri12:157.75:57-0.25:570.94:037:20New Moon9Fri
10Sat12:158.712:567.66:37-0.16:381.04:027:21Waxing Crescent10Sat
11Sun12:568.51:367.57:160.17:191.24:027:22Waxing Crescent11Sun
12Mon1:368.32:177.57:550.38:011.34:027:22Waxing Crescent12Mon
13Tue2:178.12:597.48:340.58:461.44:027:23Waxing Crescent13Tue
14Wed3:017.83:427.49:150.79:331.54:027:23First Quarter14Wed
15Thu3:477.54:267.59:570.810:221.54:027:23First Quarter15Thu
16Fri4:367.35:107.610:411.011:131.44:027:24First Quarter16Fri
17Sat5:277.15:567.711:261.14:027:24First Quarter17Sat
18Sun6:217.06:458.012:071.212:161.24:027:25Waxing Gibbous18Sun
19Mon7:187.07:358.31:021.01:081.14:027:25Waxing Gibbous19Mon
20Tue8:147.28:258.71:570.62:011.04:037:25Waxing Gibbous20Tue
21Wed9:077.49:159.12:500.22:530.74:037:25Waxing Gibbous21Wed
22Thu9:597.710:069.43:40-0.33:440.44:037:26Full Moon22Thu
23Fri10:508.010:579.74:31-0.74:350.24:037:26Full Moon23Fri
24Sat11:428.311:509.95:21-1.05:28-0.14:047:26Full Moon24Sat
25Sun12:348.56:12-1.26:22-0.24:047:26Waning Gibbous25Sun
26Mon12:439.91:268.77:03-1.27:17-0.24:047:26Waning Gibbous26Mon
27Tue1:379.72:198.87:54-1.18:14-0.24:057:26Waning Gibbous27Tue
28Wed2:339.43:158.98:48-0.99:14-0.14:057:26Third Quarter28Wed
29Thu3:338.94:128.99:43-0.510:170.04:067:26Third Quarter29Thu
30Fri4:358.55:098.810:39-0.111:200.24:067:26Third Quarter30Fri
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 transitional phase. Tonight's moon is 67% 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 shifting between spring and neap.

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 (67% illuminated). This places Portsmouth, NH in a transitional tide cycle, so tidal ranges are shifting between spring and neap 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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