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 2:46 AM (10.3ft) and the next low tide is at 8:59 AM (1.1ft), based on harmonic predictions for Portsmouth.
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) |
|---|---|
| Tue, Sep 15 | H 2:46 AM 10.3ftL 8:59 AM 1.1ftH 3:13 PM 9.1ftL 9:08 PM 1.8ft |
| Wed, Sep 16 | H 3:28 AM 9.9ftL 9:47 AM 1.5ftH 4:01 PM 8.5ftL 9:50 PM 2.4ft |
| Thu, Sep 17 | H 4:13 AM 9.4ftL 10:38 AM 1.9ftH 4:52 PM 7.9ftL 10:38 PM 3.0ft |
| Fri, Sep 18 | H 5:01 AM 9.0ftL 11:32 AM 2.3ftH 5:49 PM 7.5ftL 11:29 PM 3.4ft |
| Sat, Sep 19 | H 5:52 AM 8.7ftL 12:26 PM 2.5ftH 6:52 PM 7.3ft |
| Sun, Sep 20 | L 12:26 AM 3.7ftH 6:49 AM 8.5ftL 1:26 PM 2.6ftH 7:52 PM 7.3ft |
| Mon, Sep 21 | L 1:26 AM 3.8ftH 7:46 AM 8.4ftL 2:20 PM 2.5ftH 8:46 PM 7.5ft |
| Tue, Sep 22 | L 2:23 AM 3.6ftH 8:40 AM 8.5ftL 3:08 PM 2.3ftH 9:34 PM 7.9ft |
Predicted for Portsmouth, 1.1 km away (reliability: high — a close match — expect predictions within a few minutes of the published station table). Heights and times are that station's own published offsets applied to harmonic constituents from PORTLAND, its reference station 77.5 km away.
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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