Massachusetts tide station
Plum Island, Merrimack River Entrance tide times
Today, Sunday, October 18, 2026: high tide at 5:33 AM (6.7 ft) and 5:47 PM (7.6 ft); low tide at 11:34 AM (1.9 ft). Water temperature 54.7 F at Seavey Island (19 mi away).
High tide▲
5:33AM
6.7FT MLLW
high
Low tide▼
11:34AM
1.9FT MLLW
low
High tide▲
5:47PM
7.6FT MLLW
high
Water temp°F
54.7
12.6C
Seavey Island, 19 mi
predicted height above MLLWnightnow (build time; your browser updates it)
As of 5:20 AM the tide is rising toward high tide at 5:33 AM (6.7 ft).
First Quarter 51% litSunrise 7:00 AMSunset 5:56 PMDaylight 10h 55mEDT
- High tide at Plum Island, Merrimack River Entrance, Massachusetts on is at 5:33 AM (6.7 ft above MLLW) and 5:47 PM (7.6 ft above MLLW).
- Low tide at Plum Island, Merrimack River Entrance on is at 11:34 AM (1.9 ft).
- Today's tidal range at Plum Island, Merrimack River Entrance is 5.7 ft (highest high 7.6 ft, lowest low 1.9 ft).
- The nearest NOAA water temperature to Plum Island, Merrimack River Entrance is 54.7 F at Seavey Island (19 mi away), as of .
- Sunrise 7:00 AM, sunset 5:56 PM (EDT); moon first quarter, 51% illuminated.
- Predictions are NOAA CO-OPS tide predictions for station 8440452 (harmonic reference station), heights above MLLW.
Next 7 days at Plum Island, Merrimack River Entrance
| Date | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Sunrise | Sunset | Moon |
|---|---|---|---|---|---|---|---|
| Sun Oct 18today | 5:33 AM6.7 ft | 11:34 AM1.9 ft | 5:47 PM7.6 ft | 7:00 AM | 5:56 PM | 51% | |
| Mon Oct 19 | 12:18 AM1.2 ft | 6:29 AM6.7 ft | 12:32 PM1.9 ft | 6:45 PM7.5 ft | 7:02 AM | 5:55 PM | 61% |
| Tue Oct 20 | 1:14 AM1.2 ft | 7:26 AM6.9 ft | 1:31 PM1.8 ft | 7:42 PM7.5 ft | 7:03 AM | 5:53 PM | 71% |
| Wed Oct 21 | 2:08 AM1.1 ft | 8:19 AM7.2 ft | 2:28 PM1.5 ft | 8:37 PM7.7 ft | 7:04 AM | 5:52 PM | 80% |
| Thu Oct 22 | 2:57 AM0.9 ft | 9:08 AM7.6 ft | 3:19 PM1.1 ft | 9:28 PM7.8 ft | 7:05 AM | 5:50 PM | 88% |
| Fri Oct 23 | 3:43 AM0.8 ft | 9:53 AM8.0 ft | 4:07 PM0.6 ft | 10:15 PM8.0 ft | 7:07 AM | 5:49 PM | 94% |
| Sat Oct 24 | 4:25 AM0.6 ft | 10:35 AM8.5 ft | 4:52 PM0.1 ft | 11:00 PM8.2 ft | 7:08 AM | 5:47 PM | 98% |
Water temperature near Plum Island, Merrimack River Entrance
54.7 F (12.6 C)
NOAA CO-OPS station 8419870 (Seavey Island sensor, 19 mi away), read 5:00 AM local, October 18, 2026
Over the past 30 days this sensor ranged from 54.5 to 62.8 F. Typical for October here is 57.2 F (5-year hourly mean; range 52.2 to 63.5), so today is 2.5 F below typical.
Water temperature is the nearest NOAA reading to Plum Island, Merrimack River Entrance, not a measurement at the tide gauge itself (this station has no water-temperature sensor). See water temperature by state for every sensor and buoy.
Tide tables
October 2026 tide table
| Date | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Sunrise | Sunset | Moon |
|---|---|---|---|---|---|---|---|
| Thu Oct 1 | 6:41 AM | 6:25 PM | 72% | ||||
| Fri Oct 2 | 6:42 AM | 6:23 PM | 62% | ||||
| Sat Oct 3 | 6:43 AM | 6:21 PM | 52% | ||||
| Sun Oct 4 | 6:44 AM | 6:20 PM | 41% | ||||
| Mon Oct 5 | 6:45 AM | 6:18 PM | 31% | ||||
| Tue Oct 6 | 6:46 AM | 6:16 PM | 22% | ||||
| Wed Oct 7 | 6:48 AM | 6:14 PM | 14% | ||||
| Thu Oct 8 | 6:49 AM | 6:13 PM | 7% | ||||
| Fri Oct 9 | 6:50 AM | 6:11 PM | 3% | ||||
| Sat Oct 10 | 6:51 AM | 6:09 PM | 0% | ||||
| Sun Oct 11 | 6:52 AM | 6:08 PM | 0% | ||||
| Mon Oct 12 | 6:53 AM | 6:06 PM | 2% | ||||
| Tue Oct 13 | 6:55 AM | 6:04 PM | 7% | ||||
| Wed Oct 14 | 6:56 AM | 6:03 PM | 13% | ||||
| Thu Oct 15 | 6:57 AM | 6:01 PM | 21% | ||||
| Fri Oct 16 | 3:48 AM7.1 ft | 9:47 AM1.6 ft | 3:59 PM8.0 ft | 10:29 PM0.8 ft | 6:58 AM | 5:59 PM | 30% |
| Sat Oct 17 | 4:38 AM6.9 ft | 10:39 AM1.8 ft | 4:51 PM7.8 ft | 11:22 PM1.1 ft | 6:59 AM | 5:58 PM | 40% |
| Sun Oct 18today | 5:33 AM6.7 ft | 11:34 AM1.9 ft | 5:47 PM7.6 ft | 7:00 AM | 5:56 PM | 51% | |
| Mon Oct 19 | 12:18 AM1.2 ft | 6:29 AM6.7 ft | 12:32 PM1.9 ft | 6:45 PM7.5 ft | 7:02 AM | 5:55 PM | 61% |
| Tue Oct 20 | 1:14 AM1.2 ft | 7:26 AM6.9 ft | 1:31 PM1.8 ft | 7:42 PM7.5 ft | 7:03 AM | 5:53 PM | 71% |
| Wed Oct 21 | 2:08 AM1.1 ft | 8:19 AM7.2 ft | 2:28 PM1.5 ft | 8:37 PM7.7 ft | 7:04 AM | 5:52 PM | 80% |
| Thu Oct 22 | 2:57 AM0.9 ft | 9:08 AM7.6 ft | 3:19 PM1.1 ft | 9:28 PM7.8 ft | 7:05 AM | 5:50 PM | 88% |
| Fri Oct 23 | 3:43 AM0.8 ft | 9:53 AM8.0 ft | 4:07 PM0.6 ft | 10:15 PM8.0 ft | 7:07 AM | 5:49 PM | 94% |
| Sat Oct 24 | 4:25 AM0.6 ft | 10:35 AM8.5 ft | 4:52 PM0.1 ft | 11:00 PM8.2 ft | 7:08 AM | 5:47 PM | 98% |
| Sun Oct 25 | 5:06 AM0.4 ft | 11:16 AM8.9 ft | 5:37 PM-0.3 ft | 11:45 PM8.3 ft | 7:09 AM | 5:46 PM | 100% |
| Mon Oct 26 | 5:48 AM0.3 ft | 11:58 AM9.3 ft | 6:22 PM-0.7 ft | 7:10 AM | 5:44 PM | 99% | |
| Tue Oct 27 | 12:30 AM8.4 ft | 6:31 AM0.2 ft | 12:42 PM9.6 ft | 7:08 PM-0.9 ft | 7:11 AM | 5:43 PM | 97% |
| Wed Oct 28 | 1:17 AM8.4 ft | 7:16 AM0.2 ft | 1:28 PM9.8 ft | 7:56 PM-0.9 ft | 7:13 AM | 5:41 PM | 92% |
| Thu Oct 29 | 2:06 AM8.3 ft | 8:04 AM0.3 ft | 2:18 PM9.8 ft | 8:48 PM-0.8 ft | 7:14 AM | 5:40 PM | 85% |
| Fri Oct 30 | 2:58 AM8.1 ft | 8:57 AM0.4 ft | 3:12 PM9.6 ft | 9:43 PM-0.6 ft | 7:15 AM | 5:39 PM | 77% |
| Sat Oct 31 | 3:54 AM7.9 ft | 9:55 AM0.6 ft | 4:11 PM9.3 ft | 10:43 PM-0.4 ft | 7:16 AM | 5:37 PM | 68% |
November 2026 tide table
| Date | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Sunrise | Sunset | Moon |
|---|---|---|---|---|---|---|---|
| Sun Nov 1 | 3:55 AM7.8 ft | 9:58 AM0.8 ft | 4:13 PM8.9 ft | 10:44 PM-0.1 ft | 6:18 AM | 4:36 PM | 57% |
| Mon Nov 2 | 4:58 AM7.8 ft | 11:04 AM0.8 ft | 5:19 PM8.6 ft | 11:47 PM0.1 ft | 6:19 AM | 4:35 PM | 46% |
| Tue Nov 3 | 6:02 AM7.9 ft | 12:12 PM0.8 ft | 6:24 PM8.4 ft | 6:20 AM | 4:33 PM | 36% | |
| Wed Nov 4 | 12:48 AM0.2 ft | 7:04 AM8.2 ft | 1:18 PM0.6 ft | 7:28 PM8.3 ft | 6:22 AM | 4:32 PM | 26% |
| Thu Nov 5 | 1:46 AM0.2 ft | 8:01 AM8.5 ft | 2:19 PM0.3 ft | 8:27 PM8.2 ft | 6:23 AM | 4:31 PM | 17% |
| Fri Nov 6 | 2:39 AM0.3 ft | 8:52 AM8.7 ft | 3:13 PM0.1 ft | 9:20 PM8.1 ft | 6:24 AM | 4:30 PM | 10% |
| Sat Nov 7 | 3:27 AM0.4 ft | 9:39 AM8.9 ft | 4:01 PM-0.1 ft | 10:08 PM8.0 ft | 6:25 AM | 4:28 PM | 5% |
| Sun Nov 8 | 4:11 AM0.5 ft | 10:21 AM8.9 ft | 4:46 PM-0.1 ft | 10:52 PM7.8 ft | 6:27 AM | 4:27 PM | 1% |
| Mon Nov 9 | 4:52 AM0.7 ft | 11:02 AM8.9 ft | 5:27 PM-0.1 ft | 11:34 PM7.7 ft | 6:28 AM | 4:26 PM | 0% |
| Tue Nov 10 | 5:32 AM0.9 ft | 11:41 AM8.7 ft | 6:07 PM-0.0 ft | 6:29 AM | 4:25 PM | 1% | |
| Wed Nov 11 | 12:14 AM7.5 ft | 6:11 AM1.1 ft | 12:20 PM8.6 ft | 6:47 PM0.1 ft | 6:30 AM | 4:24 PM | 4% |
| Thu Nov 12 | 12:54 AM7.3 ft | 6:50 AM1.3 ft | 1:00 PM8.4 ft | 7:27 PM0.3 ft | 6:32 AM | 4:23 PM | 10% |
| Fri Nov 13 | 1:35 AM7.2 ft | 7:32 AM1.4 ft | 1:42 PM8.3 ft | 8:11 PM0.5 ft | 6:33 AM | 4:22 PM | 17% |
| Sat Nov 14 | 2:19 AM7.0 ft | 8:17 AM1.6 ft | 2:27 PM8.1 ft | 8:57 PM0.7 ft | 6:34 AM | 4:21 PM | 25% |
| Sun Nov 15 | 3:07 AM6.9 ft | 9:06 AM1.7 ft | 3:16 PM7.8 ft | 9:47 PM0.8 ft | 6:36 AM | 4:20 PM | 35% |
| Mon Nov 16 | 3:58 AM6.9 ft | 9:59 AM1.8 ft | 4:09 PM7.6 ft | 10:38 PM0.9 ft | 6:37 AM | 4:19 PM | 45% |
| Tue Nov 17 | 4:51 AM7.0 ft | 10:55 AM1.7 ft | 5:04 PM7.5 ft | 11:29 PM1.0 ft | 6:38 AM | 4:18 PM | 56% |
| Wed Nov 18 | 5:44 AM7.2 ft | 11:53 AM1.6 ft | 6:00 PM7.4 ft | 6:39 AM | 4:18 PM | 66% | |
| Thu Nov 19 | 12:21 AM1.0 ft | 6:36 AM7.5 ft | 12:49 PM1.3 ft | 6:56 PM7.4 ft | 6:41 AM | 4:17 PM | 76% |
| Fri Nov 20 | 1:11 AM0.9 ft | 7:25 AM7.9 ft | 1:43 PM0.9 ft | 7:50 PM7.5 ft | 6:42 AM | 4:16 PM | 84% |
| Sat Nov 21 | 1:59 AM0.8 ft | 8:13 AM8.3 ft | 2:34 PM0.4 ft | 8:41 PM7.7 ft | 6:43 AM | 4:15 PM | 91% |
| Sun Nov 22 | 2:46 AM0.7 ft | 8:59 AM8.8 ft | 3:23 PM-0.1 ft | 9:31 PM7.9 ft | 6:44 AM | 4:15 PM | 96% |
| Mon Nov 23 | 3:32 AM0.5 ft | 9:45 AM9.2 ft | 4:12 PM-0.6 ft | 10:20 PM8.0 ft | 6:45 AM | 4:14 PM | 99% |
| Tue Nov 24 | 4:18 AM0.3 ft | 10:31 AM9.6 ft | 5:01 PM-0.9 ft | 11:09 PM8.1 ft | 6:47 AM | 4:13 PM | 100% |
| Wed Nov 25 | 5:06 AM0.2 ft | 11:20 AM9.9 ft | 5:50 PM-1.1 ft | 11:59 PM8.2 ft | 6:48 AM | 4:13 PM | 98% |
| Thu Nov 26 | 5:56 AM0.1 ft | 12:10 PM10.0 ft | 6:41 PM-1.2 ft | 6:49 AM | 4:12 PM | 95% | |
| Fri Nov 27 | 12:50 AM8.2 ft | 6:47 AM0.1 ft | 1:02 PM9.9 ft | 7:33 PM-1.1 ft | 6:50 AM | 4:12 PM | 89% |
| Sat Nov 28 | 1:43 AM8.2 ft | 7:42 AM0.2 ft | 1:57 PM9.7 ft | 8:27 PM-0.9 ft | 6:51 AM | 4:11 PM | 81% |
| Sun Nov 29 | 2:39 AM8.2 ft | 8:41 AM0.3 ft | 2:55 PM9.3 ft | 9:24 PM-0.6 ft | 6:52 AM | 4:11 PM | 73% |
| Mon Nov 30 | 3:37 AM8.1 ft | 9:43 AM0.4 ft | 3:56 PM8.9 ft | 10:22 PM-0.3 ft | 6:53 AM | 4:11 PM | 63% |
Tidal datums at Plum Island, Merrimack River Entrance
Heights on this page are above mean lower low water (MLLW), the chart datum. NOAA's accepted datums for station 8440452, in feet above MLLW:
MHHW
13.17 ft
Mean higher high water
MHW
12.76 ft
Mean high water
MSL
8.76 ft
Mean sea level
MLW
4.76 ft
Mean low water
MN
8.00 ft
Mean range
GT
8.70 ft
Diurnal range
Nearby tide stations
- Newburyport2.7 mi · next high 5:35 AM
- Salisbury Point4.7 mi · next high 6:08 AM
- Hampton Harbor5.4 mi · next high 5:31 AM
- Plum Island Sound (south end)7.5 mi · next high 5:30 AM
- Merrimacport8.5 mi · next high 6:28 AM
- Riverside11 mi · next high 7:04 AM
Questions
What time is high tide at Plum Island, Merrimack River Entrance today?
High tide at Plum Island, Merrimack River Entrance, Massachusetts on Sunday, October 18, 2026 is at 5:33 AM (6.7 ft above MLLW) and 5:47 PM (7.6 ft above MLLW), NOAA prediction, local time.
What time is low tide at Plum Island, Merrimack River Entrance today?
Low tide at Plum Island, Merrimack River Entrance on Sunday, October 18, 2026 is at 11:34 AM (1.9 ft).
What is the water temperature at Plum Island, Merrimack River Entrance?
The nearest NOAA water-temperature reading to Plum Island, Merrimack River Entrance is 54.7 F at Seavey Island (19 mi away), as of October 18, 2026.
Not for navigation. Predictions do not include weather; wind and pressure can move the real water level by a foot or more. Source: NOAA CO-OPS station 8440452.