Portsmouth Tide Chart
New Hampshire · NOAA Station 8423745 · 43.078°, -70.752°
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This Week’s Tides for Portsmouth
High and low tide times and heights (ft, MLLW) for the week ahead.
| High | 5:37 AM | 7.6 ft |
| Low | 11:37 AM | 0.7 ft |
| High | 6:03 PM | 8.1 ft |
| Low | 12:20 AM | 0.8 ft |
| High | 6:35 AM | 7.2 ft |
| Low | 12:29 PM | 1.2 ft |
| High | 6:56 PM | 8.0 ft |
| Low | 1:20 AM | 1.0 ft |
| High | 7:35 AM | 6.9 ft |
| Low | 1:24 PM | 1.5 ft |
| High | 7:51 PM | 7.9 ft |
| Low | 2:21 AM | 1.0 ft |
| High | 8:35 AM | 6.7 ft |
| Low | 2:22 PM | 1.7 ft |
| High | 8:46 PM | 7.8 ft |
| Low | 3:18 AM | 0.9 ft |
| High | 9:31 AM | 6.7 ft |
| Low | 3:16 PM | 1.7 ft |
| High | 9:38 PM | 7.9 ft |
| Low | 4:09 AM | 0.8 ft |
| High | 10:22 AM | 6.8 ft |
| Low | 4:05 PM | 1.6 ft |
| High | 10:26 PM | 8.1 ft |
| Low | 4:54 AM | 0.6 ft |
| High | 11:08 AM | 6.9 ft |
| Low | 4:49 PM | 1.5 ft |
| High | 11:09 PM | 8.2 ft |
Portsmouth Tide Table — Next 30 Days
Every high and low tide for the next month at Portsmouth, with heights in feet (MLLW), the daily tidal range, and sunrise & sunset.
| Day | Sunrise | Sunset | Tides (time · ft, MLLW) | Range | |||
|---|---|---|---|---|---|---|---|
| Tue, Jul 21Today | 5:22 AM | 8:16 PM | High5:37 AM7.6 ft | Low11:37 AM0.7 ft | High6:03 PM8.1 ft | — | 7.4 ft |
| Wed, Jul 22 | 5:23 AM | 8:15 PM | Low12:20 AM0.8 ft | High6:35 AM7.2 ft | Low12:29 PM1.2 ft | High6:56 PM8.0 ft | 7.2 ft |
| Thu, Jul 23 | 5:24 AM | 8:14 PM | Low1:20 AM1.0 ft | High7:35 AM6.9 ft | Low1:24 PM1.5 ft | High7:51 PM7.9 ft | 6.9 ft |
| Fri, Jul 24 | 5:25 AM | 8:13 PM | Low2:21 AM1.0 ft | High8:35 AM6.7 ft | Low2:22 PM1.7 ft | High8:46 PM7.8 ft | 6.8 ft |
| Sat, Jul 25 | 5:26 AM | 8:12 PM | Low3:18 AM0.9 ft | High9:31 AM6.7 ft | Low3:16 PM1.7 ft | High9:38 PM7.9 ft | 7.0 ft |
| Sun, Jul 26 | 5:27 AM | 8:11 PM | Low4:09 AM0.8 ft | High10:22 AM6.8 ft | Low4:05 PM1.6 ft | High10:26 PM8.1 ft | 7.3 ft |
| Mon, Jul 27 | 5:28 AM | 8:10 PM | Low4:54 AM0.6 ft | High11:08 AM6.9 ft | Low4:49 PM1.5 ft | High11:09 PM8.2 ft | 7.6 ft |
| Tue, Jul 28 | 5:29 AM | 8:09 PM | Low5:34 AM0.5 ft | High11:50 AM7.1 ft | Low5:29 PM1.3 ft | High11:50 PM8.4 ft | 7.9 ft |
| Wed, Jul 29 | 5:30 AM | 8:08 PM | Low6:12 AM0.3 ft | High12:29 PM7.3 ft | Low6:08 PM1.1 ft | — | 7.0 ft |
| Thu, Jul 30 | 5:31 AM | 8:07 PM | High12:28 AM8.5 ft | Low6:46 AM0.2 ft | High1:05 PM7.5 ft | Low6:46 PM1.0 ft | 8.3 ft |
| Fri, Jul 31 | 5:32 AM | 8:06 PM | High1:05 AM8.5 ft | Low7:19 AM0.1 ft | High1:39 PM7.7 ft | Low7:24 PM0.8 ft | 8.4 ft |
| Sat, Aug 1 | 5:33 AM | 8:05 PM | High1:41 AM8.5 ft | Low7:53 AM0.0 ft | High2:13 PM7.9 ft | Low8:02 PM0.7 ft | 8.5 ft |
| Sun, Aug 2 | 5:34 AM | 8:04 PM | High2:18 AM8.4 ft | Low8:27 AM0.0 ft | High2:47 PM8.1 ft | Low8:44 PM0.5 ft | 8.4 ft |
| Mon, Aug 3 | 5:35 AM | 8:02 PM | High2:57 AM8.3 ft | Low9:05 AM0.1 ft | High3:25 PM8.3 ft | Low9:28 PM0.4 ft | 8.2 ft |
| Tue, Aug 4 | 5:36 AM | 8:01 PM | High3:41 AM8.1 ft | Low9:46 AM0.2 ft | High4:07 PM8.4 ft | Low10:18 PM0.4 ft | 8.2 ft |
| Wed, Aug 5 | 5:38 AM | 8:00 PM | High4:31 AM7.8 ft | Low10:33 AM0.4 ft | High4:55 PM8.5 ft | Low11:12 PM0.3 ft | 8.2 ft |
| Thu, Aug 6 | 5:39 AM | 7:59 PM | High5:26 AM7.6 ft | Low11:24 AM0.6 ft | High5:48 PM8.6 ft | — | 8.0 ft |
| Fri, Aug 7 | 5:40 AM | 7:57 PM | Low12:10 AM0.3 ft | High6:26 AM7.3 ft | Low12:21 PM0.8 ft | High6:47 PM8.7 ft | 8.4 ft |
| Sat, Aug 8 | 5:41 AM | 7:56 PM | Low1:15 AM0.3 ft | High7:33 AM7.2 ft | Low1:23 PM0.8 ft | High7:52 PM8.8 ft | 8.5 ft |
| Sun, Aug 9 | 5:42 AM | 7:54 PM | Low2:23 AM0.1 ft | High8:42 AM7.3 ft | Low2:31 PM0.7 ft | High8:59 PM9.0 ft | 8.9 ft |
| Mon, Aug 10 | 5:43 AM | 7:53 PM | Low3:29 AM-0.2 ft | High9:48 AM7.6 ft | Low3:35 PM0.5 ft | High10:02 PM9.3 ft | 9.5 ft |
| Tue, Aug 11 | 5:44 AM | 7:52 PM | Low4:29 AM-0.5 ft | High10:47 AM7.9 ft | Low4:36 PM0.2 ft | High11:01 PM9.5 ft | 10.0 ft |
| Wed, Aug 12 | 5:45 AM | 7:50 PM | Low5:24 AM-0.8 ft | High11:43 AM8.2 ft | Low5:33 PM-0.1 ft | High11:57 PM9.6 ft | 10.4 ft |
| Thu, Aug 13 | 5:46 AM | 7:49 PM | Low6:16 AM-0.9 ft | High12:35 PM8.5 ft | Low6:27 PM-0.3 ft | — | 9.4 ft |
| Fri, Aug 14 | 5:47 AM | 7:47 PM | High12:49 AM9.6 ft | Low7:04 AM-0.9 ft | High1:23 PM8.7 ft | Low7:19 PM-0.3 ft | 10.5 ft |
| Sat, Aug 15 | 5:48 AM | 7:46 PM | High1:39 AM9.3 ft | Low7:50 AM-0.7 ft | High2:10 PM8.8 ft | Low8:09 PM-0.2 ft | 10.0 ft |
| Sun, Aug 16 | 5:49 AM | 7:44 PM | High2:28 AM8.9 ft | Low8:35 AM-0.3 ft | High2:55 PM8.7 ft | Low8:59 PM0.0 ft | 9.2 ft |
| Mon, Aug 17 | 5:51 AM | 7:43 PM | High3:17 AM8.4 ft | Low9:20 AM0.1 ft | High3:41 PM8.5 ft | Low9:51 PM0.3 ft | 8.4 ft |
| Tue, Aug 18 | 5:52 AM | 7:41 PM | High4:09 AM7.9 ft | Low10:06 AM0.6 ft | High4:29 PM8.2 ft | Low10:44 PM0.6 ft | 7.6 ft |
| Wed, Aug 19 | 5:53 AM | 7:40 PM | High5:02 AM7.3 ft | Low10:55 AM1.1 ft | High5:19 PM7.9 ft | Low11:40 PM0.9 ft | 7.0 ft |
About Portsmouth tides
Tide predictions for Portsmouth come from NOAA station 8423745 (New Hampshire), 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.
Portsmouth 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.
Frequently asked
What time is high tide in Portsmouth today?+
Today (Tuesday, July 21), high tide at Portsmouth is at 5:37 AM (7.6 ft), 6:03 PM (8.1 ft). Heights are referenced to MLLW (Mean Lower Low Water).
What time is low tide in Portsmouth today?+
Today, low tide at Portsmouth is at 11:37 AM (0.7 ft).
What tidal datum do these Portsmouth 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.
Never mistime a tide again.
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