Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

66°
H 80°
L 59°
SW
1mph
High tide
9:49 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, August 24, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide : 3:34 pm (1.6 ft)
Next high tide : in 5h 47m at 9:49 am (6.7 ft)
Sunset today : 7:31 pm
Sunrise tomorrow : 5:58 am
Moon phase : Waxing Gibbous (88% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Aug 1950

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue2:079.02:428.28:22-0.38:360.45:338:05Waning Gibbous1Tue
2Wed2:548.53:268.19:050.09:250.65:348:04Waning Gibbous2Wed
3Thu3:418.14:108.09:470.410:150.85:358:02Waning Gibbous3Thu
4Fri4:307.64:567.810:310.911:061.15:368:01Third Quarter4Fri
5Sat5:217.15:437.711:161.311:591.25:378:00Third Quarter5Sat
6Sun6:156.86:327.512:041.65:387:59Third Quarter6Sun
7Mon7:126.57:267.512:551.312:561.85:397:57Third Quarter7Mon
8Tue8:126.48:227.51:551.41:531.95:407:56Waning Crescent8Tue
9Wed9:106.59:167.72:541.22:501.95:417:55Waning Crescent9Wed
10Thu10:016.610:058.03:461.03:411.75:427:53Waning Crescent10Thu
11Fri10:476.910:508.34:320.74:271.45:437:52Waning Crescent11Fri
12Sat11:307.211:328.65:130.45:101.15:447:51New Moon12Sat
13Sun12:107.55:520.15:520.75:467:49New Moon13Sun
14Mon12:148.812:497.96:30-0.26:350.45:477:48New Moon14Mon
15Tue12:559.01:278.27:08-0.47:180.15:487:46Waxing Crescent15Tue
16Wed1:379.02:068.57:47-0.58:03-0.15:497:45Waxing Crescent16Wed
17Thu2:218.92:478.88:28-0.58:51-0.25:507:43Waxing Crescent17Thu
18Fri3:078.73:328.99:12-0.39:43-0.25:517:42Waxing Crescent18Fri
19Sat3:598.34:228.910:000.010:38-0.15:527:40First Quarter19Sat
20Sun4:567.95:188.810:530.311:390.15:537:39First Quarter20Sun
21Mon5:587.66:188.711:510.75:547:37First Quarter21Mon
22Tue7:067.37:248.612:440.212:550.95:557:35Waxing Gibbous22Tue
23Wed8:167.28:338.71:540.22:031.05:577:34Waxing Gibbous23Wed
24Thu9:237.49:378.83:030.13:110.95:587:32Waxing Gibbous24Thu
25Fri10:237.610:359.04:04-0.14:110.65:597:31Waxing Gibbous25Fri
26Sat11:167.911:289.14:58-0.35:060.46:007:29Full Moon26Sat
27Sun12:048.15:47-0.45:560.26:017:27Full Moon27Sun
28Mon12:179.012:498.26:31-0.36:430.26:027:26Full Moon28Mon
29Tue1:028.91:308.37:12-0.27:270.26:037:24Waning Gibbous29Tue
30Wed1:458.62:088.37:500.18:090.36:047:22Waning Gibbous30Wed
31Thu2:268.22:468.28:270.48:520.56:057:20Waning Gibbous31Thu
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 spring phase. Tonight's moon is 88% 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 maximum.

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 Waxing Gibbous (88% illuminated). This places Portsmouth, NH in a spring tide cycle, so tidal ranges are near their weekly maximum 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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