Portsmouth Harbor (Kittery) tide times · NOAA station Seavey Island

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Portsmouth Harbor (Kittery) at a glance

Tides: Twice a day
Typical range: 8.9 fthigh to low
Highest of 2027: 10.3 ftTue, Jul 6
Lowest of 2027: -1.5 ftSat, Jan 23
Record high: 13.1 ftJan 13, 2024
High water after the moon: 11 h 15 min

The tide at Portsmouth Harbor (Kittery)

Pattern: Twice-daily
Two high tides and two low tides a day, about 12 h 25 min apart. The two highs are close: on average just 0.8 ft apart. Form number 0.17.
Typical range: 8.9 ft from the higher high to the lower low on an average day (2.71 m) - a bigger range than 89% of the 235 places on this site.
After the moon: High water comes about 11 h 15 min after the moon is highest in the sky.

2027: the biggest and smallest tides

The highest tides of 2027 - the king tides
Tue, Jul 6	1:14 am	10.3 ft
Tue, Aug 3	12:05 am	10.3 ft
Sat, Jan 23	11:34 am	10.2 ft

The lowest tides of 2027
Sat, Jan 23	5:55 pm	-1.5 ft	in the dark
Sun, Feb 21	5:34 pm	-1.3 ft	in the dark
Wed, Aug 4	7:17 am	-1.2 ft	in daylight

The lowest tides of 2027 in daylight - for tide pools
Wed, Aug 4	7:17 am	-1.2 ft
Sat, Feb 20	4:46 pm	-1.2 ft
Tue, Jul 6	7:38 am	-1.2 ft

181 low tides in 2027 drop below zero - below the average lower low water - and uncover more shore than usual.

Records

Highest water recorded: 13.1 ft (3.98 m) on Jan 13, 2024 - 4.2 ft above the average higher high.
Lowest water recorded: -3.3 ft (-1.00 m) on Nov 30, 1955.
Highest tide the moon and sun can raise: 10.6 ft (3.23 m) - the highest astronomical tide in NOAA’s 19-year cycle, which falls on May 19, 2034.

Tide times nearby

Portland47 mi northeast
Boston53 mi south
Providence94 mi south
Fall River97 mi south
Warwick (Conimicut Point)99 mi south

See the moon move the ocean - the same tide, on a globe seen from the moon.

Heights are above mean lower low water (MLLW), the zero of US charts; times are local. The year’s tides are NOAA’s official predictions - wind and air pressure can move the real water a foot or more. Form number: (K1+O1)/(M2+S2) from NOAA’s harmonic constants - below 0.25 twice-daily, above 3 once-daily. Maine, 43.080°N 70.741°W. Predictions and records: NOAA CO-OPS, station 8419870. Not for navigation or safety. For a boat, a crossing of sand that floods, or a swim, use the official tables and local advice. No ads, no tracking.