Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

61°
H 64°
L 40°
NNE
12mph
Low tide
1:18 pm
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 : in 2h 27m at 1:18 pm (1.9 ft)
Next high tide : 7:39 pm (7.4 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 - Sep 1915

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed4:296.84:427.510:161.711:061.35:066:20Third Quarter1Wed
2Thu5:266.55:387.411:091.95:076:18Third Quarter2Thu
3Fri6:266.46:377.412:061.412:082.05:086:16Waning Crescent3Fri
4Sat7:266.57:367.61:081.41:081.95:096:14Waning Crescent4Sat
5Sun8:196.78:287.82:041.12:041.65:106:13Waning Crescent5Sun
6Mon9:067.09:148.12:510.82:521.35:116:11Waning Crescent6Mon
7Tue9:477.49:568.43:310.53:350.95:126:09New Moon7Tue
8Wed10:267.810:378.74:080.24:170.55:136:07New Moon8Wed
9Thu11:038.311:178.84:45-0.14:580.15:146:06New Moon9Thu
10Fri11:408.711:598.85:22-0.35:40-0.35:166:04New Moon10Fri
11Sat12:189.06:00-0.36:24-0.55:176:02Waxing Crescent11Sat
12Sun12:418.812:589.26:41-0.37:09-0.65:186:00Waxing Crescent12Sun
13Mon1:278.61:429.27:25-0.17:58-0.55:195:58Waxing Crescent13Mon
14Tue2:168.22:329.18:130.18:53-0.35:205:57First Quarter14Tue
15Wed3:127.93:288.99:060.59:530.05:215:55First Quarter15Wed
16Thu4:157.54:328.610:060.810:580.25:225:53First Quarter16Thu
17Fri5:227.35:408.511:111.05:235:51First Quarter17Fri
18Sat6:337.36:528.512:090.312:221.05:245:49Waxing Gibbous18Sat
19Sun7:427.57:598.61:190.31:330.85:255:48Waxing Gibbous19Sun
20Mon8:427.88:598.72:220.12:370.55:275:46Waxing Gibbous20Mon
21Tue9:348.29:528.83:16-0.13:320.25:285:44Full Moon21Tue
22Wed10:228.510:418.84:04-0.24:22-0.15:295:42Full Moon22Wed
23Thu11:058.611:278.74:47-0.25:08-0.25:305:40Full Moon23Thu
24Fri11:458.75:280.05:52-0.25:315:39Full Moon24Fri
25Sat12:108.412:238.76:070.26:33-0.15:325:37Waning Gibbous25Sat
26Sun12:518.11:018.56:440.57:140.15:335:35Waning Gibbous26Sun
27Mon1:327.81:398.27:220.97:550.45:345:33Waning Gibbous27Mon
28Tue2:147.42:198.08:021.28:390.75:355:31Waning Gibbous28Tue
29Wed3:007.03:057.78:451.69:291.15:375:30Third Quarter29Wed
30Thu3:516.73:587.49:341.810:221.35:385:28Third Quarter30Thu
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.
Any commercial use, modification, redistribution, or repackaging without written permission is strictly prohibited.

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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