Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

41°
H -°
L 39°
N
1mph
Low tide
1:04 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 : in 30m at 1:04 am (1.3 ft)
Next high tide : 7:31 am (6.7 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 - Jul 2052

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Mon3:279.14:078.59:42-0.610:050.35:088:26Waxing Crescent1Mon
2Tue4:238.65:018.310:34-0.111:030.65:088:26First Quarter2Tue
3Wed5:198.15:548.211:270.35:098:25First Quarter3Wed
4Thu6:167.66:478.112:010.812:190.75:098:25First Quarter4Thu
5Fri7:137.37:408.01:001.01:131.05:108:25First Quarter5Fri
6Sat8:117.18:338.01:591.02:071.25:118:24Waxing Gibbous6Sat
7Sun9:077.19:228.12:560.92:591.35:118:24Waxing Gibbous7Sun
8Mon9:587.110:088.23:460.83:471.35:128:24Waxing Gibbous8Mon
9Tue10:457.210:518.34:310.64:301.25:138:23Waxing Gibbous9Tue
10Wed11:287.411:328.55:130.45:111.15:148:23Full Moon10Wed
11Thu12:097.55:510.25:501.05:148:22Full Moon11Thu
12Fri12:118.612:487.66:280.16:290.95:158:22Full Moon12Fri
13Sat12:498.71:257.87:04-0.17:080.75:168:21Full Moon13Sat
14Sun1:268.72:017.97:40-0.27:480.65:178:20Waning Gibbous14Sun
15Mon2:048.72:398.18:17-0.28:300.55:188:20Waning Gibbous15Mon
16Tue2:458.63:198.28:57-0.29:160.45:198:19Waning Gibbous16Tue
17Wed3:308.54:048.49:41-0.210:060.35:198:18Third Quarter17Wed
18Thu4:208.44:538.610:29-0.111:000.35:208:17Third Quarter18Thu
19Fri5:148.25:468.711:200.011:580.25:218:17Third Quarter19Fri
20Sat6:148.06:438.912:160.15:228:16Third Quarter20Sat
21Sun7:177.97:449.01:000.11:150.25:238:15Waning Crescent21Sun
22Mon8:247.98:479.22:06-0.12:190.25:248:14Waning Crescent22Mon
23Tue9:298.19:479.53:10-0.43:210.15:258:13Waning Crescent23Tue
24Wed10:298.310:459.74:10-0.74:20-0.15:268:12New Moon24Wed
25Thu11:268.511:409.85:06-1.05:17-0.35:278:11New Moon25Thu
26Fri12:198.75:59-1.16:11-0.45:288:10New Moon26Fri
27Sat12:339.81:118.86:50-1.17:03-0.35:298:09New Moon27Sat
28Sun1:249.61:598.87:38-1.07:54-0.25:308:08Waxing Crescent28Sun
29Mon2:139.32:478.78:25-0.78:440.05:318:07Waxing Crescent29Mon
30Tue3:028.83:348.59:11-0.39:350.35:328:06Waxing Crescent30Tue
31Wed3:528.34:238.39:580.110:270.65:338:05First Quarter31Wed
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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