Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

57°
H 57°
L 40°
SE
6mph
High tide
6:42 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, October 19, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide (tomorrow) : 1:04 am (1.3 ft)
Next high tide : in 3h 47m at 6:42 pm (7.3 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 - Jan 1845

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed4:078.04:297.610:150.610:350.37:194:23Third Quarter1Wed
2Thu4:598.15:287.511:130.411:300.47:194:23Third Quarter2Thu
3Fri5:568.46:337.412:150.27:194:24Waning Crescent3Fri
4Sat6:578.77:397.612:300.41:20-0.17:194:25Waning Crescent4Sat
5Sun7:599.18:427.91:330.22:23-0.67:184:26Waning Crescent5Sun
6Mon8:589.59:418.22:34-0.13:22-1.07:184:27New Moon6Mon
7Tue9:559.810:378.63:32-0.44:17-1.47:184:28New Moon7Tue
8Wed10:5010.011:318.84:28-0.75:11-1.67:184:29New Moon8Wed
9Thu11:4510.05:22-0.86:02-1.77:184:30New Moon9Thu
10Fri12:248.912:379.86:16-0.86:52-1.57:174:32Waxing Crescent10Fri
11Sat1:148.91:299.57:09-0.77:42-1.27:174:33Waxing Crescent11Sat
12Sun2:058.82:228.98:03-0.48:32-0.77:174:34Waxing Crescent12Sun
13Mon2:578.63:178.38:59-0.19:24-0.27:164:35First Quarter13Mon
14Tue3:508.34:157.89:570.210:170.37:164:36First Quarter14Tue
15Wed4:448.15:147.310:570.511:120.87:154:37First Quarter15Wed
16Thu5:407.86:146.911:590.77:154:39First Quarter16Thu
17Fri6:377.77:166.812:091.11:010.87:144:40Waxing Gibbous17Fri
18Sat7:347.78:136.81:091.32:000.77:144:41Waxing Gibbous18Sat
19Sun8:267.89:046.92:051.32:520.67:134:42Waxing Gibbous19Sun
20Mon9:148.09:507.12:541.23:370.47:124:43Waxing Gibbous20Mon
21Tue9:578.210:327.33:371.04:170.27:124:45Full Moon21Tue
22Wed10:378.311:107.54:170.84:540.07:114:46Full Moon22Wed
23Thu11:148.411:467.64:550.65:28-0.17:104:47Full Moon23Thu
24Fri11:508.55:310.56:01-0.27:094:49Full Moon24Fri
25Sat12:207.812:258.56:070.36:34-0.37:094:50Waning Gibbous25Sat
26Sun12:547.91:018.46:450.27:09-0.37:084:51Waning Gibbous26Sun
27Mon1:288.11:398.37:250.17:47-0.27:074:52Waning Gibbous27Mon
28Tue2:058.22:228.18:080.18:28-0.17:064:54Waning Gibbous28Tue
29Wed2:478.33:107.98:560.19:150.07:054:55Third Quarter29Wed
30Thu3:358.34:047.69:490.110:070.27:044:56Third Quarter30Thu
31Fri4:308.45:057.410:480.111:040.47:034:58Third Quarter31Fri
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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