Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

66°
H 67°
L 54°
ENE
5mph
High tide
3:01 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Tuesday, September 15, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide : 9:17 pm (0.3 ft)
Next high tide : in 3h 56m at 3:01 pm (8.4 ft)
Sunset today : 6:53 pm
Sunrise tomorrow : 6:22 am
Moon phase : Waxing Crescent (21% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - May 1968

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Wed2:158.12:587.18:360.48:381.55:367:44Waxing Crescent1Wed
2Thu2:528.03:396.99:160.69:191.75:347:45Waxing Crescent2Thu
3Fri3:357.84:256.710:000.810:061.85:337:46Waxing Crescent3Fri
4Sat4:237.75:156.710:490.910:581.85:317:47First Quarter4Sat
5Sun5:167.66:086.811:410.911:541.75:307:48First Quarter5Sun
6Mon6:137.67:027.112:340.85:297:49First Quarter6Mon
7Tue7:127.77:567.512:531.51:290.65:287:50Waxing Gibbous7Tue
8Wed8:127.98:488.11:541.02:230.45:267:51Waxing Gibbous8Wed
9Thu9:118.29:378.82:530.43:150.15:257:53Waxing Gibbous9Thu
10Fri10:058.410:259.43:48-0.24:05-0.25:247:54Waxing Gibbous10Fri
11Sat10:598.711:139.84:40-0.84:53-0.45:237:55Full Moon11Sat
12Sun11:528.85:32-1.35:43-0.45:227:56Full Moon12Sun
13Mon12:0210.112:458.86:24-1.56:34-0.35:217:57Full Moon13Mon
14Tue12:5310.11:398.77:17-1.57:27-0.25:207:58Waning Gibbous14Tue
15Wed1:4610.02:348.48:11-1.38:210.15:187:59Waning Gibbous15Wed
16Thu2:419.63:328.19:07-1.09:190.55:178:00Waning Gibbous16Thu
17Fri3:409.14:357.910:07-0.510:220.85:168:01Third Quarter17Fri
18Sat4:448.75:387.711:10-0.111:291.15:168:02Third Quarter18Sat
19Sun5:508.26:407.712:120.35:158:03Third Quarter19Sun
20Mon6:557.97:407.712:361.21:130.55:148:04Third Quarter20Mon
21Tue7:597.78:367.91:431.12:110.75:138:05Waning Crescent21Tue
22Wed8:597.59:268.02:461.03:040.85:128:06Waning Crescent22Wed
23Thu9:527.510:108.23:400.73:501.05:118:07Waning Crescent23Thu
24Fri10:407.410:508.34:270.54:321.15:108:08Waning Crescent24Fri
25Sat11:247.411:288.45:100.35:111.25:108:09New Moon25Sat
26Sun12:057.45:490.25:471.25:098:10New Moon26Sun
27Mon12:048.412:457.36:260.26:231.35:088:11New Moon27Mon
28Tue12:408.31:237.37:030.26:591.45:088:12New Moon28Tue
29Wed1:168.32:007.27:380.37:361.55:078:13Waxing Crescent29Wed
30Thu1:528.22:387.18:150.48:141.55:078:14Waxing Crescent30Thu
31Fri2:308.23:177.08:540.48:551.65:068:14Waxing Crescent31Fri
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 21% 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 Waxing Crescent (21% 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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