Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

55°
H -°
L 51°
NNE
2mph
Low tide
2:52 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Monday, September 21, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide (tomorrow) : in 5h 36m at 2:52 am (1.2 ft)
Next high tide (tomorrow) : 9:09 am (6.8 ft)
Sunset today : 6:42 pm
Sunrise tomorrow : 6:29 am
Moon phase : Waxing Gibbous (75% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - May 1960

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Sun3:358.04:187.29:530.510:041.45:367:44Waxing Crescent1Sun
2Mon4:217.75:077.110:390.710:531.65:347:45First Quarter2Mon
3Tue5:117.55:577.011:280.911:451.65:337:46First Quarter3Tue
4Wed6:047.46:497.112:191.05:327:47First Quarter4Wed
5Thu7:007.47:427.412:411.61:120.95:307:48First Quarter5Thu
6Fri7:577.58:337.71:381.32:050.85:297:49Waxing Gibbous6Fri
7Sat8:527.79:218.22:340.92:560.55:287:50Waxing Gibbous7Sat
8Sun9:448.010:068.73:270.43:440.25:267:51Waxing Gibbous8Sun
9Mon10:348.410:519.24:16-0.24:30-0.15:257:53Full Moon9Mon
10Tue11:238.711:379.65:04-0.75:17-0.45:247:54Full Moon10Tue
11Wed12:128.95:52-1.26:05-0.55:237:55Full Moon11Wed
12Thu12:249.91:039.06:42-1.46:55-0.65:227:56Full Moon12Thu
13Fri1:1410.01:549.07:32-1.57:46-0.55:217:57Waning Gibbous13Fri
14Sat2:0510.02:488.88:25-1.48:40-0.35:207:58Waning Gibbous14Sat
15Sun2:599.73:468.69:20-1.29:380.05:197:59Waning Gibbous15Sun
16Mon3:589.34:488.410:19-0.810:410.35:188:00Third Quarter16Mon
17Tue5:028.95:518.311:21-0.511:470.55:178:01Third Quarter17Tue
18Wed6:088.66:548.312:23-0.25:168:02Third Quarter18Wed
19Thu7:148.37:568.312:540.61:270.15:158:03Waning Crescent19Thu
20Fri8:208.18:548.52:020.52:280.25:148:04Waning Crescent20Fri
21Sat9:208.09:468.63:050.33:240.35:138:05Waning Crescent21Sat
22Sun10:158.010:348.74:000.14:130.45:128:06Waning Crescent22Sun
23Mon11:048.011:178.84:49-0.14:580.55:118:07New Moon23Mon
24Tue11:497.911:578.85:33-0.15:390.65:108:08New Moon24Tue
25Wed12:327.96:15-0.26:180.75:108:09New Moon25Wed
26Thu12:368.71:127.86:53-0.16:560.95:098:10New Moon26Thu
27Fri1:138.61:507.77:300.07:331.05:088:11Waxing Crescent27Fri
28Sat1:498.52:287.68:070.18:101.15:088:12Waxing Crescent28Sat
29Sun2:268.33:077.58:440.28:501.35:078:13Waxing Crescent29Sun
30Mon3:058.13:487.49:230.49:321.45:078:13Waxing Crescent30Mon
31Tue3:477.94:327.310:050.510:191.45:068:14Waxing Crescent31Tue
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 75% 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 Gibbous (75% 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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