Nearby Harbors
43.0783’ N, 70.7517’ W

Portsmouth, NH

65°
H 78°
L 47°
WNW
2mph
Low tide
11:05 am
Photo Credits

Tides Today & Tomorrow in Portsmouth, NH

TIDE TIMES for Friday, September 18, 2026
The tide is currently falling in Portsmouth, NH.
Next low tide : in 3h 20m at 11:05 am (1.8 ft)
Next high tide : 5:29 pm (7.5 ft)
Sunset today : 6:47 pm
Sunrise tomorrow : 6:26 am
Moon phase : First Quarter (48% illuminated)
Tide Station Location : Station #8423745
Common Questions About Tides

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Portsmouth, NH Tides - Aug 2086

Print this Tide Chart
DateHigh TideLow TideSunMoonDate
AMftPMftAMftPMftRiseSet
1Thu4:338.65:029.110:35-0.311:16-0.25:348:04Third Quarter1Thu
2Fri5:358.26:019.011:320.15:358:03Third Quarter2Fri
3Sat6:407.87:048.812:200.012:330.55:368:01Third Quarter3Sat
4Sun7:477.58:088.71:270.11:380.75:378:00Waning Crescent4Sun
5Mon8:537.59:118.72:350.12:440.85:387:59Waning Crescent5Mon
6Tue9:547.610:088.83:370.03:440.75:397:57Waning Crescent6Tue
7Wed10:487.711:008.84:31-0.14:380.65:417:56New Moon7Wed
8Thu11:367.811:478.85:20-0.15:260.55:427:55New Moon8Thu
9Fri12:207.96:04-0.26:110.55:437:53New Moon9Fri
10Sat12:308.71:008.06:44-0.16:530.55:447:52New Moon10Sat
11Sun1:108.61:388.17:200.07:320.55:457:51Waxing Crescent11Sun
12Mon1:498.42:138.17:550.28:100.65:467:49Waxing Crescent12Mon
13Tue2:268.12:498.08:290.48:490.75:477:48Waxing Crescent13Tue
14Wed3:057.83:267.99:050.79:300.95:487:46Waxing Crescent14Wed
15Thu3:467.54:057.89:430.910:141.05:497:45First Quarter15Thu
16Fri4:317.24:497.710:251.211:021.15:507:43First Quarter16Fri
17Sat5:206.95:377.711:111.411:541.25:517:42First Quarter17Sat
18Sun6:136.76:297.712:011.55:537:40First Quarter18Sun
19Mon7:106.77:257.812:501.212:561.55:547:39Waxing Gibbous19Mon
20Tue8:096.88:238.11:491.01:551.45:557:37Waxing Gibbous20Tue
21Wed9:067.19:198.52:470.72:531.05:567:35Waxing Gibbous21Wed
22Thu9:597.610:118.93:400.23:480.55:577:34Waxing Gibbous22Thu
23Fri10:478.111:029.34:29-0.34:400.05:587:32Full Moon23Fri
24Sat11:358.611:529.65:16-0.75:31-0.55:597:31Full Moon24Sat
25Sun12:229.16:03-1.06:22-0.96:007:29Full Moon25Sun
26Mon12:429.71:109.56:50-1.27:13-1.16:017:27Waning Gibbous26Mon
27Tue1:339.71:589.77:38-1.28:05-1.26:027:26Waning Gibbous27Tue
28Wed2:249.42:489.78:27-0.98:59-1.06:037:24Waning Gibbous28Wed
29Thu3:199.03:429.59:18-0.69:57-0.76:057:22Third Quarter29Thu
30Fri4:188.54:409.210:14-0.110:59-0.36:067:20Third Quarter30Fri
31Sat5:218.05:438.811:150.36:077:19Third Quarter31Sat
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 48% 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 (48% 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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