Porthmadog tide times and boat scrubbing days
Porthmadog is a UK Hydrographic Office tide station in Wales at 52.917°, -4.133°. 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.
No high water falls between 06:30 and 09:00 in the next 7 days. The monthly calendar shows the next suitable scrubbing mornings.
| Day | Tidal events | Scrubbing morning? |
|---|---|---|
| Fri 11 Sept | HW 09:24 (5.2 m) HW 21:40 (5.5 m) | — |
| Sat 12 Sept | HW 10:00 (5.3 m) HW 22:15 (5.5 m) | — |
| Sun 13 Sept | HW 10:33 (5.2 m) HW 22:48 (5.3 m) | — |
| Mon 14 Sept | HW 11:04 (5.1 m) HW 23:19 (5.1 m) | — |
| Tue 15 Sept | HW 11:37 (4.8 m) HW 23:53 (4.7 m) | — |
| Wed 16 Sept | HW 12:10 (4.4 m) | — |
| Thu 17 Sept | HW 00:26 (4.2 m) HW 12:44 (4.0 m) | — |
Open the Porthmadog monthly calendar
Planning a scrub at Porthmadog
- 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.