Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

51°
H -°
L 45°
S
1mph
Low tide
12:56 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Saturday, September 19, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide (tomorrow) : in 2h 34m at 12:56 am (1.4 ft)
Next high tide (tomorrow) : 7:18 am (6.5 ft)
Sunset today : 6:46 pm
Sunrise tomorrow : 6:27 am
Moon phase : First Quarter (58% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Oct 1899

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun9:017.69:177.92:460.83:020.95:405:25Waning Crescent1Sun
2Mon9:417.89:588.03:260.73:430.75:415:23Waning Crescent2Mon
3Tue10:178.110:378.14:010.64:200.45:425:21New Moon3Tue
4Wed10:518.311:148.14:340.54:560.25:435:19New Moon4Wed
5Thu11:248.411:508.05:070.55:310.15:445:17New Moon5Thu
6Fri11:578.55:410.56:070.05:465:16New Moon6Fri
7Sat12:267.912:328.66:160.66:450.05:475:14Waxing Crescent7Sat
8Sun1:047.81:098.66:540.77:270.05:485:12Waxing Crescent8Sun
9Mon1:457.61:528.57:360.88:130.15:495:11Waxing Crescent9Mon
10Tue2:317.52:418.58:240.99:050.35:505:09First Quarter10Tue
11Wed3:257.33:388.49:181.010:030.35:515:07First Quarter11Wed
12Thu4:257.34:418.310:181.011:040.35:535:05First Quarter12Thu
13Fri5:297.55:478.411:230.95:545:04First Quarter13Fri
14Sat6:347.86:558.512:080.212:310.65:555:02Waxing Gibbous14Sat
15Sun7:368.38:008.71:110.01:380.25:565:00Waxing Gibbous15Sun
16Mon8:328.88:598.92:10-0.22:38-0.45:574:59Waxing Gibbous16Mon
17Tue9:249.39:539.13:03-0.53:34-0.85:594:57Full Moon17Tue
18Wed10:149.610:469.13:54-0.64:26-1.26:004:56Full Moon18Wed
19Thu11:029.711:379.04:42-0.65:17-1.36:014:54Full Moon19Thu
20Fri11:499.75:30-0.46:06-1.26:024:52Waning Gibbous20Fri
21Sat12:278.712:369.56:17-0.16:55-0.96:034:51Waning Gibbous21Sat
22Sun1:158.41:249.17:050.37:44-0.56:054:49Waning Gibbous22Sun
23Mon2:058.02:138.77:540.78:350.06:064:48Waning Gibbous23Mon
24Tue2:587.63:078.28:461.19:300.56:074:46Third Quarter24Tue
25Wed3:547.34:047.89:421.410:260.86:084:45Third Quarter25Wed
26Thu4:507.15:027.510:411.611:231.06:104:43Third Quarter26Thu
27Fri5:477.16:017.411:411.66:114:42Third Quarter27Fri
28Sat6:417.26:587.312:181.112:411.56:124:41Waning Crescent28Sat
29Sun7:327.47:527.41:111.11:371.36:144:39Waning Crescent29Sun
30Mon8:187.78:407.51:581.02:261.06:154:38Waning Crescent30Mon
31Tue8:598.09:247.62:400.93:080.66:164:36Waning Crescent31Tue
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 neap phase. Tonight's moon is 58% 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 (58% 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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