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 12:28 AM (3.14 m) and the next low tide is at 6:23 AM (0.24 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, Jul 15 | H 12:28 AM 3.14 mL 6:23 AM 0.24 mH 12:43 PM 3.36 mL 6:56 PM -0.02 m |
| Thu, Jul 16 | H 1:16 AM 3.17 mL 7:14 AM 0.21 mH 1:34 PM 3.33 mL 7:44 PM 0.02 m |
| Fri, Jul 17 | H 2:04 AM 3.17 mL 8:05 AM 0.22 mH 2:22 PM 3.26 mL 8:35 PM 0.11 m |
| Sat, Jul 18 | H 2:52 AM 3.13 mL 8:56 AM 0.26 mH 3:13 PM 3.15 mL 9:23 PM 0.23 m |
| Sun, Jul 19 | H 3:43 AM 3.07 mL 9:47 AM 0.33 mH 4:07 PM 3.01 mL 10:11 PM 0.39 m |
| Mon, Jul 20 | H 4:31 AM 2.98 mL 10:41 AM 0.42 mH 5:01 PM 2.85 mL 11:02 PM 0.55 m |
| Tue, Jul 21 | H 5:25 AM 2.88 mL 11:38 AM 0.50 mH 5:58 PM 2.70 mL 11:56 PM 0.70 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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