Flat Holm tide times and boat scrubbing days
Flat Holm is a UK Hydrographic Office tide station in Wales at 51.383°, -3.117°. This page lists the next 7 days of official Admiralty high and low water predictions and flags the mornings when high water falls in the 06:30 to 09:00 scrubbing window. The interactive calendar extends this to a full month with harmonic predictions.
3 mornings in the next 7 days have a high water between 06:30 and 09:00, the ideal window to put a boat on the scrubbing grid or posts: Mon 9 Nov, Tue 10 Nov, Wed 11 Nov.
| Day | Tidal events | Scrubbing morning? |
|---|---|---|
| Thu 5 Nov | HW 03:33 (9.9 m) LW 09:43 (2.5 m) HW 15:56 (10.5 m) LW 22:17 (2.1 m) | — |
| Fri 6 Nov | HW 04:27 (10.6 m) LW 10:37 (1.9 m) HW 16:48 (11.1 m) LW 23:08 (1.6 m) | — |
| Sat 7 Nov | HW 05:14 (11.2 m) LW 11:27 (1.5 m) HW 17:34 (11.5 m) LW 23:54 (1.3 m) | — |
| Sun 8 Nov | HW 05:58 (11.5 m) LW 12:13 (1.3 m) HW 18:16 (11.7 m) | — |
| Mon 9 Nov | LW 00:39 (1.2 m) HW 06:36 (11.7 m) LW 12:57 (1.3 m) HW 18:55 (11.6 m) | ✅ Yes |
| Tue 10 Nov | LW 01:20 (1.3 m) HW 07:13 (11.6 m) LW 13:37 (1.4 m) HW 19:30 (11.4 m) | ✅ Yes |
| Wed 11 Nov | LW 01:55 (1.6 m) HW 07:46 (11.3 m) LW 14:10 (1.7 m) HW 20:03 (11.1 m) | ✅ Yes |
Open the Flat Holm monthly calendar
Planning a scrub at Flat Holm
- Aim for a high water between 06:30 and 09:00 so the boat dries out through the morning and refloats on the afternoon flood.
- Spring tides (around new and full moon) give a larger range and more working time on the grid.
- Check the height of high water against the depth of your grid or posts; neap tides may not float a deep-keeled yacht on.
- Predictions beyond 7 days are harmonic estimates. Confirm dates against official tide tables before committing a crane or grid booking.