Plum Island, Merrimack River Entrance Tide Chart
Massachusetts · NOAA Station 8440452 · 42.817°, -70.820°
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This Week’s Tides for Plum Island, Merrimack River Entrance
High and low tide times and heights (ft, MLLW) for the week ahead.
| Low | 12:19 AM | 0.7 ft |
| High | 6:25 AM | 7.4 ft |
| Low | 12:32 PM | 1.0 ft |
| High | 6:50 PM | 8.2 ft |
| Low | 1:17 AM | 0.9 ft |
| High | 7:22 AM | 7.0 ft |
| Low | 1:26 PM | 1.3 ft |
| High | 7:44 PM | 8.1 ft |
| Low | 2:15 AM | 0.9 ft |
| High | 8:20 AM | 6.8 ft |
| Low | 2:21 PM | 1.5 ft |
| High | 8:38 PM | 8.0 ft |
| Low | 3:11 AM | 0.9 ft |
| High | 9:16 AM | 6.7 ft |
| Low | 3:14 PM | 1.6 ft |
| High | 9:30 PM | 8.1 ft |
| Low | 4:02 AM | 0.9 ft |
| High | 10:07 AM | 6.8 ft |
| Low | 4:03 PM | 1.6 ft |
| High | 10:18 PM | 8.2 ft |
| Low | 4:49 AM | 0.7 ft |
| High | 10:53 AM | 6.8 ft |
| Low | 4:49 PM | 1.5 ft |
| High | 11:02 PM | 8.3 ft |
| Low | 5:32 AM | 0.6 ft |
| High | 11:37 AM | 7.0 ft |
| Low | 5:32 PM | 1.4 ft |
| High | 11:45 PM | 8.4 ft |
Plum Island, Merrimack River Entrance Tide Table — Next 30 Days
Every high and low tide for the next month at Plum Island, Merrimack River Entrance, with heights in feet (MLLW), the daily tidal range, and sunrise & sunset.
| Day | Sunrise | Sunset | Tides (time · ft, MLLW) | Range | |||
|---|---|---|---|---|---|---|---|
| Wed, Jul 22Today | 5:24 AM | 8:15 PM | Low12:19 AM0.7 ft | High6:25 AM7.4 ft | Low12:32 PM1.0 ft | High6:50 PM8.2 ft | 7.5 ft |
| Thu, Jul 23 | 5:25 AM | 8:14 PM | Low1:17 AM0.9 ft | High7:22 AM7.0 ft | Low1:26 PM1.3 ft | High7:44 PM8.1 ft | 7.2 ft |
| Fri, Jul 24 | 5:26 AM | 8:13 PM | Low2:15 AM0.9 ft | High8:20 AM6.8 ft | Low2:21 PM1.5 ft | High8:38 PM8.0 ft | 7.1 ft |
| Sat, Jul 25 | 5:27 AM | 8:12 PM | Low3:11 AM0.9 ft | High9:16 AM6.7 ft | Low3:14 PM1.6 ft | High9:30 PM8.1 ft | 7.2 ft |
| Sun, Jul 26 | 5:28 AM | 8:11 PM | Low4:02 AM0.9 ft | High10:07 AM6.8 ft | Low4:03 PM1.6 ft | High10:18 PM8.2 ft | 7.3 ft |
| Mon, Jul 27 | 5:29 AM | 8:10 PM | Low4:49 AM0.7 ft | High10:53 AM6.8 ft | Low4:49 PM1.5 ft | High11:02 PM8.3 ft | 7.6 ft |
| Tue, Jul 28 | 5:30 AM | 8:09 PM | Low5:32 AM0.6 ft | High11:37 AM7.0 ft | Low5:32 PM1.4 ft | High11:45 PM8.4 ft | 7.8 ft |
| Wed, Jul 29 | 5:31 AM | 8:08 PM | Low6:13 AM0.5 ft | High12:17 PM7.2 ft | Low6:14 PM1.2 ft | — | 6.7 ft |
| Thu, Jul 30 | 5:32 AM | 8:07 PM | High12:25 AM8.5 ft | Low6:51 AM0.3 ft | High12:56 PM7.4 ft | Low6:55 PM1.1 ft | 8.2 ft |
| Fri, Jul 31 | 5:33 AM | 8:05 PM | High1:05 AM8.5 ft | Low7:28 AM0.2 ft | High1:34 PM7.7 ft | Low7:35 PM0.9 ft | 8.3 ft |
| Sat, Aug 1 | 5:34 AM | 8:04 PM | High1:44 AM8.6 ft | Low8:05 AM0.2 ft | High2:13 PM7.9 ft | Low8:17 PM0.7 ft | 8.4 ft |
| Sun, Aug 2 | 5:35 AM | 8:03 PM | High2:25 AM8.5 ft | Low8:43 AM0.2 ft | High2:53 PM8.1 ft | Low9:01 PM0.6 ft | 8.3 ft |
| Mon, Aug 3 | 5:36 AM | 8:02 PM | High3:08 AM8.3 ft | Low9:24 AM0.3 ft | High3:36 PM8.3 ft | Low9:49 PM0.5 ft | 8.0 ft |
| Tue, Aug 4 | 5:37 AM | 8:01 PM | High3:56 AM8.1 ft | Low10:09 AM0.4 ft | High4:22 PM8.5 ft | Low10:42 PM0.4 ft | 8.1 ft |
| Wed, Aug 5 | 5:38 AM | 7:59 PM | High4:48 AM7.8 ft | Low10:57 AM0.6 ft | High5:13 PM8.6 ft | Low11:38 PM0.4 ft | 8.2 ft |
| Thu, Aug 6 | 5:40 AM | 7:58 PM | High5:45 AM7.6 ft | Low11:51 AM0.8 ft | High6:09 PM8.7 ft | — | 7.9 ft |
| Fri, Aug 7 | 5:41 AM | 7:57 PM | Low12:38 AM0.3 ft | High6:46 AM7.4 ft | Low12:49 PM0.9 ft | High7:08 PM8.8 ft | 8.5 ft |
| Sat, Aug 8 | 5:42 AM | 7:56 PM | Low1:42 AM0.2 ft | High7:50 AM7.3 ft | Low1:51 PM0.9 ft | High8:11 PM9.0 ft | 8.8 ft |
| Sun, Aug 9 | 5:43 AM | 7:54 PM | Low2:45 AM0.0 ft | High8:54 AM7.4 ft | Low2:53 PM0.8 ft | High9:13 PM9.2 ft | 9.2 ft |
| Mon, Aug 10 | 5:44 AM | 7:53 PM | Low3:46 AM-0.2 ft | High9:54 AM7.6 ft | Low3:54 PM0.6 ft | High10:12 PM9.5 ft | 9.7 ft |
| Tue, Aug 11 | 5:45 AM | 7:51 PM | Low4:43 AM-0.5 ft | High10:51 AM7.9 ft | Low4:51 PM0.3 ft | High11:08 PM9.6 ft | 10.1 ft |
| Wed, Aug 12 | 5:46 AM | 7:50 PM | Low5:36 AM-0.7 ft | High11:44 AM8.3 ft | Low5:46 PM0.0 ft | — | 9.0 ft |
| Thu, Aug 13 | 5:47 AM | 7:49 PM | High12:01 AM9.7 ft | Low6:26 AM-0.8 ft | High12:34 PM8.6 ft | Low6:39 PM-0.2 ft | 10.5 ft |
| Fri, Aug 14 | 5:48 AM | 7:47 PM | High12:51 AM9.6 ft | Low7:13 AM-0.7 ft | High1:21 PM8.8 ft | Low7:29 PM-0.3 ft | 10.3 ft |
| Sat, Aug 15 | 5:49 AM | 7:46 PM | High1:40 AM9.4 ft | Low7:57 AM-0.6 ft | High2:07 PM8.9 ft | Low8:18 PM-0.2 ft | 10.0 ft |
| Sun, Aug 16 | 5:50 AM | 7:44 PM | High2:27 AM9.0 ft | Low8:42 AM-0.3 ft | High2:52 PM8.9 ft | Low9:06 PM-0.1 ft | 9.3 ft |
| Mon, Aug 17 | 5:51 AM | 7:43 PM | High3:15 AM8.5 ft | Low9:26 AM0.1 ft | High3:38 PM8.7 ft | Low9:56 PM0.2 ft | 8.6 ft |
| Tue, Aug 18 | 5:52 AM | 7:41 PM | High4:04 AM8.0 ft | Low10:13 AM0.6 ft | High4:26 PM8.5 ft | Low10:48 PM0.5 ft | 8.0 ft |
| Wed, Aug 19 | 5:54 AM | 7:40 PM | High4:55 AM7.5 ft | Low11:01 AM1.0 ft | High5:16 PM8.2 ft | Low11:41 PM0.8 ft | 7.4 ft |
| Thu, Aug 20 | 5:55 AM | 7:38 PM | High5:48 AM7.1 ft | Low11:53 AM1.4 ft | High6:09 PM8.0 ft | — | 6.6 ft |
About Plum Island, Merrimack River Entrance tides
Tide predictions for Plum Island, Merrimack River Entrance come from NOAA station 8440452 (Massachusetts), computed from long-term harmonic analysis of observed water levels. Heights are shown in feet relative to MLLW (Mean Lower Low Water) — the same datum used on US nautical charts — so they line up directly with charted depths.
Plum Island, Merrimack River Entrance typically sees a mixed semidiurnal tide, with two highs and two lows of differing heights each day. Use the curve above to time a harbor entrance, a beach walk, fishing a moving tide, or clearing a shallow bar — and remember that wind and pressure can push the real water level above or below prediction. The daily tidal range in the 30-day table shows how much water moves each day: bigger ranges around the new and full moon mean stronger currents.
The current water temperature near Plum Island, Merrimack River Entrance is about 67°F, from the nearest reporting buoy (Great Bay Buoy buoy 44074, 18 mi away). Water temperature shapes where fish hold and feed, and tells you what to wear in the water — check it alongside the tide before you head out.
Frequently asked
What time is high tide in Plum Island, Merrimack River Entrance today?+
Today (Wednesday, July 22), high tide at Plum Island, Merrimack River Entrance is at 6:25 AM (7.4 ft), 6:50 PM (8.2 ft). Heights are referenced to MLLW (Mean Lower Low Water).
What time is low tide in Plum Island, Merrimack River Entrance today?+
Today, low tide at Plum Island, Merrimack River Entrance is at 12:19 AM (0.7 ft), 12:32 PM (1.0 ft).
What tidal datum do these Plum Island, Merrimack River Entrance tide heights use?+
All heights are given in feet relative to MLLW (Mean Lower Low Water), the standard NOAA chart datum for US tidal waters. A tide of 0.0 ft equals the chart datum; negative tides fall below it.
How accurate are these tide predictions?+
These are NOAA harmonic predictions — highly accurate for the astronomical tide. Real water levels can still differ with wind, barometric pressure, and storms, so always check current conditions before getting underway.
What is the water temperature at Plum Island, Merrimack River Entrance?+
The latest sea-surface temperature near Plum Island, Merrimack River Entrance is about 67°F, from the nearest reporting buoy (Great Bay Buoy buoy 44074, 18 mi away). Water temperature drives fish behavior and tells you what to wear in the water, so it's worth checking alongside the tide.
Never mistime a tide again.
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