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 2:31 AM (3.21 m) and the next low tide is at 8:35 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) |
|---|---|
| Sun, Aug 16 | H 2:31 AM 3.21 mL 8:35 AM 0.24 mH 2:52 PM 3.06 mL 8:53 PM 0.28 m |
| Mon, Aug 17 | H 3:16 AM 3.13 mL 9:26 AM 0.32 mH 3:40 PM 2.89 mL 9:41 PM 0.46 m |
| Tue, Aug 18 | H 4:01 AM 3.02 mL 10:14 AM 0.42 mH 4:31 PM 2.71 mL 10:26 PM 0.65 m |
| Wed, Aug 19 | H 4:49 AM 2.89 mL 11:08 AM 0.54 mH 5:25 PM 2.54 mL 11:17 PM 0.83 m |
| Thu, Aug 20 | H 5:37 AM 2.78 mL 12:02 PM 0.63 mH 6:25 PM 2.40 mL 12:11 AM 0.98 m |
| Fri, Aug 21 | H 6:31 AM 2.68 mL 1:02 PM 0.70 mH 7:28 PM 2.32 m |
| Sat, Aug 22 | L 1:08 AM 1.08 mH 7:28 AM 2.62 mL 1:59 PM 0.72 mH 8:28 PM 2.31 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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