Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

52°
H -°
L 41°
NE
5mph
Low tide
1:57 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Tuesday, October 20, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide (tomorrow) : in 5h 44m at 1:57 am (1.2 ft)
Next high tide (tomorrow) : 8:22 am (7.0 ft)
Sunset today : 5:52 pm
Sunrise tomorrow : 7:02 am
Moon phase : First Quarter (69% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Dec 1842

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu10:049.510:468.33:430.04:26-1.16:584:13New Moon1Thu
2Fri10:539.611:368.24:330.05:16-1.16:594:13New Moon2Fri
3Sat11:429.45:220.16:04-0.97:014:13New Moon3Sat
4Sun12:258.112:299.26:100.36:51-0.77:024:12Waxing Crescent4Sun
5Mon1:127.91:168.96:570.57:37-0.37:034:12Waxing Crescent5Mon
6Tue1:587.72:038.47:450.88:240.17:044:12Waxing Crescent6Tue
7Wed2:467.52:528.08:341.19:110.47:054:12Waxing Crescent7Wed
8Thu3:367.33:447.69:271.39:590.77:064:12First Quarter8Thu
9Fri4:257.34:377.310:221.410:461.07:064:12First Quarter9Fri
10Sat5:157.35:327.011:171.511:351.27:074:12First Quarter10Sat
11Sun6:057.36:296.812:141.47:084:12First Quarter11Sun
12Mon6:547.57:256.812:251.41:111.27:094:12Waxing Gibbous12Mon
13Tue7:437.78:186.81:161.42:041.07:104:12Waxing Gibbous13Tue
14Wed8:287.99:077.02:051.42:510.67:114:12Waxing Gibbous14Wed
15Thu9:118.29:517.12:491.23:340.37:114:12Waxing Gibbous15Thu
16Fri9:538.410:347.33:321.04:150.07:124:13Full Moon16Fri
17Sat10:358.711:177.54:140.84:57-0.37:134:13Full Moon17Sat
18Sun11:188.911:597.74:570.65:39-0.57:134:13Full Moon18Sun
19Mon12:029.15:420.46:23-0.77:144:14Waning Gibbous19Mon
20Tue12:437.812:479.16:280.37:08-0.77:154:14Waning Gibbous20Tue
21Wed1:288.01:359.07:170.27:54-0.77:154:15Waning Gibbous21Wed
22Thu2:168.12:288.88:100.28:44-0.67:164:15Waning Gibbous22Thu
23Fri3:098.33:258.59:070.29:38-0.47:164:16Third Quarter23Fri
24Sat4:048.44:268.110:080.210:33-0.17:164:16Third Quarter24Sat
25Sun5:028.55:317.811:120.211:320.27:174:17Third Quarter25Sun
26Mon6:018.66:397.612:190.17:174:18Waning Crescent26Mon
27Tue7:038.77:467.612:340.41:26-0.17:184:18Waning Crescent27Tue
28Wed8:038.88:487.61:370.52:29-0.37:184:19Waning Crescent28Wed
29Thu9:009.09:447.72:360.53:25-0.67:184:20Waning Crescent29Thu
30Fri9:529.110:367.83:310.44:17-0.77:184:20New Moon30Fri
31Sat10:429.111:237.94:210.35:05-0.77:184:21New Moon31Sat
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 transitional phase. Tonight's moon is 69% 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 (69% 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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