NOAA station analysis · local station time
Seattle Tide Range: Which Dates Have the Largest Spread?
Which Seattle dates have the largest NOAA-predicted tide range over the next 30 days?
The answer
From September 28, 2026 through October 27, 2026, Seattle, Washington's largest listed NOAA turn-to-turn range is 13.729 ft (4.185 m converted) on October 26, 2026. The smallest listed range is 5.291 ft (1.613 m converted) on October 27, 2026.
Across the 30 local dates, NOAA returned 4 dates with 3 listed turns (13%), 26 dates with 4 listed turns (87%). The page preserves those returned counts; it does not add a tide event where the official response supplied none.
How this calculation works
For each local date, this page subtracts the lowest listed NOAA high/low prediction from the highest listed prediction. NOAA supplies feet relative to Mean Lower Low Water (MLLW); metres are conversions from those official feet values.
A listed prediction range is not observed water depth, launch clearance, or a safety guarantee. Wind, pressure, storms, and local conditions can make observed water different.
30-day NOAA station sequence
| Local date | Listed turns | Lowest turn | Highest turn | Computed range |
|---|---|---|---|---|
| 2026-09-28 | 4 | 00:21 · 0.136 ft | 18:15 · 11.388 ft | 11.252 ft (3.430 m) |
| 2026-09-29 | 4 | 00:59 · -0.842 ft | 18:45 · 11.274 ft | 12.116 ft (3.693 m) |
| 2026-09-30 | 4 | 01:41 · -1.470 ft | 19:18 · 11.006 ft | 12.476 ft (3.803 m) |
| 2026-10-01 | 4 | 02:28 · -1.672 ft | 09:38 · 10.806 ft | 12.478 ft (3.803 m) |
| 2026-10-02 | 4 | 03:21 · -1.466 ft | 10:53 · 10.570 ft | 12.036 ft (3.669 m) |
| 2026-10-03 | 4 | 04:21 · -0.976 ft | 12:23 · 10.504 ft | 11.480 ft (3.499 m) |
| 2026-10-04 | 4 | 05:29 · -0.397 ft | 13:45 · 10.704 ft | 11.101 ft (3.384 m) |
| 2026-10-05 | 3 | 06:42 · 0.102 ft | 14:41 · 11.004 ft | 10.902 ft (3.323 m) |
| 2026-10-06 | 4 | 07:51 · 0.509 ft | 15:22 · 11.268 ft | 10.759 ft (3.279 m) |
| 2026-10-07 | 4 | 08:52 · 0.962 ft | 15:53 · 11.451 ft | 10.489 ft (3.197 m) |
| 2026-10-08 | 4 | 09:45 · 1.596 ft | 16:20 · 11.538 ft | 9.942 ft (3.030 m) |
| 2026-10-09 | 4 | 23:14 · 0.946 ft | 16:44 · 11.522 ft | 10.576 ft (3.224 m) |
| 2026-10-10 | 4 | 23:45 · 0.019 ft | 17:08 · 11.393 ft | 11.374 ft (3.467 m) |
| 2026-10-11 | 3 | 11:58 · 4.528 ft | 17:32 · 11.145 ft | 6.617 ft (2.017 m) |
| 2026-10-12 | 4 | 00:17 · -0.626 ft | 07:12 · 10.980 ft | 11.606 ft (3.538 m) |
| 2026-10-13 | 4 | 00:50 · -0.959 ft | 07:59 · 11.088 ft | 12.047 ft (3.672 m) |
| 2026-10-14 | 4 | 01:24 · -0.975 ft | 08:46 · 11.056 ft | 12.031 ft (3.667 m) |
| 2026-10-15 | 4 | 02:03 · -0.696 ft | 09:36 · 10.887 ft | 11.583 ft (3.530 m) |
| 2026-10-16 | 4 | 02:45 · -0.187 ft | 10:32 · 10.635 ft | 10.822 ft (3.299 m) |
| 2026-10-17 | 4 | 03:34 · 0.454 ft | 11:39 · 10.416 ft | 9.962 ft (3.036 m) |
| 2026-10-18 | 4 | 04:30 · 1.100 ft | 12:47 · 10.346 ft | 9.246 ft (2.818 m) |
| 2026-10-19 | 3 | 05:33 · 1.638 ft | 13:42 · 10.428 ft | 8.790 ft (2.679 m) |
| 2026-10-20 | 4 | 06:38 · 2.025 ft | 14:21 · 10.591 ft | 8.566 ft (2.611 m) |
| 2026-10-21 | 4 | 07:37 · 2.337 ft | 14:49 · 10.784 ft | 8.447 ft (2.575 m) |
| 2026-10-22 | 4 | 08:30 · 2.703 ft | 15:13 · 10.988 ft | 8.285 ft (2.525 m) |
| 2026-10-23 | 4 | 22:10 · 1.737 ft | 15:35 · 11.188 ft | 9.451 ft (2.881 m) |
| 2026-10-24 | 4 | 22:39 · 0.274 ft | 15:58 · 11.370 ft | 11.096 ft (3.382 m) |
| 2026-10-25 | 4 | 23:13 · -1.081 ft | 16:24 · 11.507 ft | 12.588 ft (3.837 m) |
| 2026-10-26 | 4 | 23:50 · -2.162 ft | 16:52 · 11.567 ft | 13.729 ft (4.185 m) |
| 2026-10-27 | 3 | 12:15 · 6.469 ft | 06:51 · 11.760 ft | 5.291 ft (1.613 m) |
Source and reproducibility
Source: NOAA CO-OPS Tide Predictions API, station 9447130, request 2026-09-28 through 2026-10-27, MLLW, station local time, English units.