Today’s high and low tides
Same-day table comparison
For September 25, 2026, this page places NOAA station 8423898 beside Tide Forecast’s published Portsmouth table. Both tables are shown as published prediction tables; the differences below are direct calculations from their displayed times and heights, not observed water levels.
| Event | NOAA 8423898 | Tide Forecast Portsmouth | Displayed difference |
|---|---|---|---|
| Low | 04:43 · 0.40 ft | 4:38 AM · 0.25 ft | 5 min · 0.15 ft |
| High | 10:56 · 8.84 ft | 10:52 AM · 8.93 ft | 4 min · 0.09 ft |
| Low | 16:58 · 0.44 ft | 4:53 PM · 0.31 ft | 5 min · 0.13 ft |
| High | 23:11 · 9.28 ft | 11:07 PM · 9.36 ft | 4 min · 0.08 ft |
Use the difference as a prompt to check the source details before planning a launch or fishing window. Do not infer a cause beyond what the source tables disclose.
Next 30 days of Portsmouth tides
This on-page table lists NOAA station 8423898 high and low predictions from September 25 through October 24, 2026. Heights are feet relative to MLLW; meters are converted from the official foot values.
| Date | Local prediction times and heights |
|---|---|
| 2026-09-25 | Low 04:43 · 0.40 ft (0.122 m) High 10:56 · 8.84 ft (2.695 m) Low 16:58 · 0.44 ft (0.133 m) High 23:11 · 9.28 ft (2.827 m) |
| 2026-09-26 | Low 05:18 · 0.17 ft (0.053 m) High 11:32 · 9.30 ft (2.834 m) Low 17:38 · -0.01 ft (-0.002 m) High 23:51 · 9.39 ft (2.863 m) |
| 2026-09-27 | Low 05:54 · 0.02 ft (0.005 m) High 12:08 · 9.70 ft (2.957 m) Low 18:18 · -0.37 ft (-0.114 m) |
| 2026-09-28 | High 00:32 · 9.41 ft (2.869 m) Low 06:32 · -0.05 ft (-0.015 m) High 12:46 · 10.01 ft (3.051 m) Low 19:00 · -0.62 ft (-0.188 m) |
| 2026-09-29 | High 01:15 · 9.33 ft (2.843 m) Low 07:12 · -0.00 ft (-0.001 m) High 13:27 · 10.18 ft (3.102 m) Low 19:45 · -0.69 ft (-0.211 m) |
| 2026-09-30 | High 02:01 · 9.13 ft (2.782 m) Low 07:55 · 0.16 ft (0.048 m) High 14:12 · 10.18 ft (3.103 m) Low 20:34 · -0.59 ft (-0.180 m) |
| 2026-10-01 | High 02:51 · 8.83 ft (2.693 m) Low 08:44 · 0.42 ft (0.128 m) High 15:02 · 10.03 ft (3.056 m) Low 21:28 · -0.34 ft (-0.105 m) |
| 2026-10-02 | High 03:46 · 8.49 ft (2.589 m) Low 09:38 · 0.74 ft (0.226 m) High 15:59 · 9.77 ft (2.977 m) Low 22:28 · -0.04 ft (-0.012 m) |
| 2026-10-03 | High 04:48 · 8.19 ft (2.498 m) Low 10:40 · 1.04 ft (0.316 m) High 17:02 · 9.49 ft (2.893 m) Low 23:34 · 0.21 ft (0.064 m) |
| 2026-10-04 | High 05:56 · 8.04 ft (2.451 m) Low 11:48 · 1.20 ft (0.366 m) High 18:12 · 9.30 ft (2.833 m) |
| 2026-10-05 | Low 00:43 · 0.32 ft (0.097 m) High 07:07 · 8.12 ft (2.474 m) Low 13:00 · 1.16 ft (0.352 m) High 19:24 · 9.26 ft (2.821 m) |
| 2026-10-06 | Low 01:51 · 0.26 ft (0.079 m) High 08:15 · 8.42 ft (2.568 m) Low 14:10 · 0.88 ft (0.269 m) High 20:33 · 9.36 ft (2.853 m) |
| 2026-10-07 | Low 02:52 · 0.09 ft (0.028 m) High 09:14 · 8.87 ft (2.702 m) Low 15:13 · 0.47 ft (0.143 m) High 21:33 · 9.50 ft (2.897 m) |
| 2026-10-08 | Low 03:46 · -0.06 ft (-0.019 m) High 10:06 · 9.30 ft (2.836 m) Low 16:09 · 0.05 ft (0.015 m) High 22:28 · 9.58 ft (2.920 m) |
| 2026-10-09 | Low 04:34 · -0.13 ft (-0.038 m) High 10:53 · 9.64 ft (2.939 m) Low 16:59 · -0.27 ft (-0.084 m) High 23:17 · 9.54 ft (2.906 m) |
| 2026-10-10 | Low 05:19 · -0.06 ft (-0.019 m) High 11:36 · 9.83 ft (2.997 m) Low 17:46 · -0.45 ft (-0.136 m) |
| 2026-10-11 | High 00:03 · 9.37 ft (2.856 m) Low 06:00 · 0.13 ft (0.038 m) High 12:16 · 9.86 ft (3.005 m) Low 18:29 · -0.45 ft (-0.137 m) |
| 2026-10-12 | High 00:46 · 9.11 ft (2.776 m) Low 06:40 · 0.41 ft (0.124 m) High 12:54 · 9.74 ft (2.969 m) Low 19:11 · -0.29 ft (-0.090 m) |
| 2026-10-13 | High 01:28 · 8.77 ft (2.674 m) Low 07:19 · 0.75 ft (0.228 m) High 13:32 · 9.51 ft (2.898 m) Low 19:53 · -0.02 ft (-0.005 m) |
| 2026-10-14 | High 02:10 · 8.40 ft (2.561 m) Low 07:59 · 1.12 ft (0.341 m) High 14:12 · 9.21 ft (2.806 m) Low 20:35 · 0.34 ft (0.105 m) |
| 2026-10-15 | High 02:52 · 8.02 ft (2.445 m) Low 08:40 · 1.49 ft (0.453 m) High 14:53 · 8.87 ft (2.703 m) Low 21:20 · 0.73 ft (0.223 m) |
| 2026-10-16 | High 03:38 · 7.67 ft (2.338 m) Low 09:26 · 1.82 ft (0.556 m) High 15:40 · 8.54 ft (2.603 m) Low 22:10 · 1.08 ft (0.330 m) |
| 2026-10-17 | High 04:29 · 7.39 ft (2.252 m) Low 10:16 · 2.09 ft (0.638 m) High 16:31 · 8.27 ft (2.521 m) Low 23:04 · 1.34 ft (0.410 m) |
| 2026-10-18 | High 05:23 · 7.22 ft (2.201 m) Low 11:12 · 2.25 ft (0.685 m) High 17:27 · 8.10 ft (2.468 m) |
| 2026-10-19 | Low 00:00 · 1.47 ft (0.447 m) High 06:20 · 7.21 ft (2.198 m) Low 12:10 · 2.25 ft (0.685 m) High 18:25 · 8.04 ft (2.452 m) |
| 2026-10-20 | Low 00:55 · 1.44 ft (0.440 m) High 07:15 · 7.39 ft (2.251 m) Low 13:09 · 2.07 ft (0.631 m) High 19:23 · 8.13 ft (2.477 m) |
| 2026-10-21 | Low 01:48 · 1.29 ft (0.393 m) High 08:07 · 7.74 ft (2.358 m) Low 14:04 · 1.71 ft (0.521 m) High 20:18 · 8.31 ft (2.534 m) |
| 2026-10-22 | Low 02:35 · 1.05 ft (0.319 m) High 08:53 · 8.21 ft (2.504 m) Low 14:55 · 1.21 ft (0.368 m) High 21:07 · 8.57 ft (2.612 m) |
| 2026-10-23 | Low 03:17 · 0.76 ft (0.232 m) High 09:34 · 8.77 ft (2.673 m) Low 15:41 · 0.62 ft (0.190 m) High 21:53 · 8.84 ft (2.694 m) |
| 2026-10-24 | Low 03:58 · 0.47 ft (0.144 m) High 10:13 · 9.34 ft (2.847 m) Low 16:25 · 0.03 ft (0.009 m) High 22:38 · 9.07 ft (2.765 m) |
30-day prediction download
Download Portsmouth September–October 2026 tide predictions (CSV)
Plan with the prediction’s limits in view
Prediction, not observation
Wind, pressure, storms, and runoff can move actual water away from a published prediction.
Datum and time
Heights on this page use MLLW. Times are station local time with daylight-saving adjustment.
Source identity
The primary table is NOAA station 8423898; the comparison retains a separately published local table.
Sources
NOAA CO-OPS Data API: https://api.tidesandcurrents.noaa.gov/api/prod/datagetter
Tide Forecast Portsmouth tide times: https://www.tide-forecast.com/locations/Fort-Point-Portsmouth-Harbor-New-Hampshire/tides/latest
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