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 12:19 PM (2.94 m) and the next low tide is at 5:59 AM (0.63 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) |
|---|---|
| Sun, May 31 | L 5:59 AM 0.63 mH 12:19 PM 2.94 mL 6:32 PM 0.47 m |
| Mon, Jun 1 | H 12:49 AM 2.65 mL 6:38 AM 0.68 mH 12:55 PM 2.92 mL 7:11 PM 0.50 m |
| Tue, Jun 2 | H 1:25 AM 2.59 mL 7:14 AM 0.72 mH 1:34 PM 2.89 mL 7:53 PM 0.55 m |
| Wed, Jun 3 | H 2:04 AM 2.54 mL 7:53 AM 0.75 mH 2:13 PM 2.86 mL 8:32 PM 0.59 m |
| Thu, Jun 4 | H 2:43 AM 2.51 mL 8:32 AM 0.77 mH 2:52 PM 2.82 mL 9:11 PM 0.64 m |
| Fri, Jun 5 | H 3:22 AM 2.49 mL 9:17 AM 0.78 mH 3:37 PM 2.78 mL 9:56 PM 0.67 m |
| Sat, Jun 6 | H 4:07 AM 2.50 mL 10:05 AM 0.78 mH 4:25 PM 2.75 mL 10:44 PM 0.69 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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