Today's high and low tide times for Portsmouth, NH, plus a 7-day tide table. Astronomical predictions from the nearest harmonic station — free and updated daily.
In Portsmouth, NH, the next high tide is at 1:31 AM (3.10 m) and the next low tide is at 7:29 AM (0.22 m), based on harmonic predictions for PORTLAND.
All high and low tides for Portsmouth today, in local time (America/New York). Heights are metres above chart datum.
High (H) and low (L) tide times and heights for the next seven days at Portsmouth.
| Date | Tides (local time · height) |
|---|---|
| Wed, Jun 17 | H 1:31 AM 3.10 mL 7:29 AM 0.22 mH 1:49 PM 3.37 mL 8:05 PM 0.04 m |
| Thu, Jun 18 | H 2:22 AM 3.08 mL 8:20 AM 0.25 mH 2:40 PM 3.31 mL 8:56 PM 0.11 m |
| Fri, Jun 19 | H 3:13 AM 3.03 mL 9:14 AM 0.31 mH 3:34 PM 3.21 mL 9:47 PM 0.21 m |
| Sat, Jun 20 | H 4:07 AM 2.97 mL 10:08 AM 0.38 mH 4:28 PM 3.09 mL 10:41 PM 0.33 m |
| Sun, Jun 21 | H 5:01 AM 2.90 mL 11:05 AM 0.45 mH 5:28 PM 2.97 mL 11:38 PM 0.45 m |
| Mon, Jun 22 | H 5:58 AM 2.84 mL 12:05 PM 0.51 mH 6:28 PM 2.85 m |
| Tue, Jun 23 | L 12:35 AM 0.56 mH 6:55 AM 2.80 mL 1:05 PM 0.55 mH 7:28 PM 2.76 m |
Predicted from PORTLAND, 1.1 km away (reliability: high — a close match — expect predictions within a few minutes of the published station table).
These are astronomical tide predictions — the rise and fall driven by the moon and sun, computed by harmonic analysis. They do not include weather effects: a strong onshore wind, low barometric pressure or a storm surge can push the real water level above the predicted high, and offshore winds or high pressure can hold it below the predicted low. For navigation or any safety-critical decision, always check the official tide tables and a live water-level gauge for Portsmouth.
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