Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

46°
H -°
L 39°
ESE
1mph
Low tide
1:04 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, October 19, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide (tomorrow) : in 5h 02m at 1:04 am (1.3 ft)
Next high tide (tomorrow) : 7:31 am (6.7 ft)
Sunset today : 5:54 pm
Sunrise tomorrow : 7:01 am
Moon phase : First Quarter (59% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Oct 1844

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Tue2:037.52:098.07:521.18:260.75:445:28Waning Gibbous1Tue
2Wed2:477.22:547.88:341.49:130.95:455:26Third Quarter2Wed
3Thu3:366.93:437.69:221.610:041.15:465:24Third Quarter3Thu
4Fri4:286.84:377.410:131.710:571.25:485:23Third Quarter4Fri
5Sat5:236.75:337.411:081.811:521.25:495:21Third Quarter5Sat
6Sun6:186.86:317.512:061.65:505:19Waning Crescent6Sun
7Mon7:127.17:277.812:471.11:041.35:515:17Waning Crescent7Mon
8Tue8:017.68:188.11:390.81:580.95:525:16Waning Crescent8Tue
9Wed8:468.19:068.42:250.42:470.35:535:14Waning Crescent9Wed
10Thu9:288.79:538.73:090.03:34-0.35:555:12New Moon10Thu
11Fri10:119.210:398.93:53-0.34:20-0.85:565:11New Moon11Fri
12Sat10:559.611:279.04:37-0.55:08-1.15:575:09New Moon12Sat
13Sun11:419.85:23-0.65:56-1.35:585:07Waxing Crescent13Sun
14Mon12:169.012:299.96:11-0.66:47-1.35:595:06Waxing Crescent14Mon
15Tue1:078.81:209.87:01-0.47:40-1.16:015:04Waxing Crescent15Tue
16Wed2:028.62:159.57:54-0.18:37-0.86:025:02Waxing Crescent16Wed
17Thu3:018.23:179.18:530.29:39-0.46:035:01First Quarter17Thu
18Fri4:068.04:248.79:580.510:45-0.16:044:59First Quarter18Fri
19Sat5:137.95:328.411:070.711:520.26:054:58First Quarter19Sat
20Sun6:197.96:408.312:170.76:074:56Waxing Gibbous20Sun
21Mon7:218.07:458.212:570.31:250.66:084:54Waxing Gibbous21Mon
22Tue8:188.38:428.21:560.32:250.36:094:53Waxing Gibbous22Tue
23Wed9:078.59:338.22:480.33:160.16:104:51Waxing Gibbous23Wed
24Thu9:528.610:198.23:340.34:03-0.16:124:50Full Moon24Thu
25Fri10:328.711:028.14:160.44:45-0.26:134:48Full Moon25Fri
26Sat11:118.711:428.04:540.55:25-0.16:144:47Full Moon26Sat
27Sun11:478.65:310.76:020.06:154:45Full Moon27Sun
28Mon12:217.812:238.46:070.96:390.16:174:44Waning Gibbous28Mon
29Tue12:587.612:598.36:431.07:160.36:184:43Waning Gibbous29Tue
30Wed1:377.41:378.17:201.27:550.56:194:41Waning Gibbous30Wed
31Thu2:177.22:187.98:011.48:380.76:214:40Waning 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 neap phase. Tonight's moon is 59% 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 (59% 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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