Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

62°
H -°
L 45°
ENE
11mph
High tide
10:04 pm
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Wednesday, September 23, 2026
The tide is currently rising in Portsmouth, NH.
Next low tide (tomorrow) : 4:17 am (0.6 ft)
Next high tide : in 5h 18m at 10:04 pm (8.0 ft)
Sunset today : 6:38 pm
Sunrise tomorrow : 6:31 am
Moon phase : Waxing Gibbous (90% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Oct 1893

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun2:588.03:128.98:510.59:38-0.25:405:24Third Quarter1Sun
2Mon4:017.64:168.69:510.810:440.15:415:22Third Quarter2Mon
3Tue5:107.45:258.410:581.111:540.35:435:20Third Quarter3Tue
4Wed6:207.36:388.312:091.15:445:18Waning Crescent4Wed
5Thu7:297.57:468.41:040.31:210.95:455:17Waning Crescent5Thu
6Fri8:297.88:478.62:080.12:250.65:465:15Waning Crescent6Fri
7Sat9:218.29:408.73:020.03:210.35:475:13Waning Crescent7Sat
8Sun10:088.510:288.63:50-0.14:100.05:485:11New Moon8Sun
9Mon10:508.611:138.54:330.04:55-0.25:505:10New Moon9Mon
10Tue11:298.711:568.35:130.15:38-0.25:515:08New Moon10Tue
11Wed12:068.65:500.46:18-0.15:525:06New Moon11Wed
12Thu12:368.012:428.56:270.76:570.15:535:05Waxing Crescent12Thu
13Fri1:167.71:188.37:031.07:360.45:545:03Waxing Crescent13Fri
14Sat1:577.31:578.07:421.38:190.75:555:01Waxing Crescent14Sat
15Sun2:417.02:417.78:241.69:051.05:575:00Waxing Crescent15Sun
16Mon3:306.73:317.59:121.99:571.25:584:58First Quarter16Mon
17Tue4:256.54:277.310:052.110:531.45:594:57First Quarter17Tue
18Wed5:216.55:267.311:022.111:501.36:004:55First Quarter18Wed
19Thu6:186.66:257.412:012.06:024:53First Quarter19Thu
20Fri7:126.97:217.612:461.21:001.76:034:52Waxing Gibbous20Fri
21Sat8:017.38:137.91:370.91:541.26:044:50Waxing Gibbous21Sat
22Sun8:447.99:008.22:230.52:430.66:054:49Waxing Gibbous22Sun
23Mon9:248.49:468.53:050.23:280.06:074:47Full Moon23Mon
24Tue10:049.010:318.73:46-0.14:13-0.66:084:46Full Moon24Tue
25Wed10:469.411:188.84:28-0.34:59-1.06:094:44Full Moon25Wed
26Thu11:299.75:12-0.45:46-1.26:104:43Full Moon26Thu
27Fri12:068.812:159.85:58-0.36:35-1.26:124:41Waning Gibbous27Fri
28Sat12:558.61:049.76:46-0.17:27-1.16:134:40Waning Gibbous28Sat
29Sun1:488.31:589.47:380.28:24-0.76:144:39Waning Gibbous29Sun
30Mon2:478.02:589.08:360.59:26-0.36:154:37Third Quarter30Mon
31Tue3:527.74:058.69:400.810:320.06:174:36Third Quarter31Tue
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 spring phase. Tonight's moon is 90% 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 maximum.

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 Gibbous (90% illuminated). This places Portsmouth, NH in a spring tide cycle, so tidal ranges are near their weekly maximum 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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