About Swansea Marina
In Swansea Bay tidal streams flow anti-clockwise for 9.5 hours (Swansea HW -3.5 to +6), with at times a race off Mumbles Hd. From HW -6 to -3 the stream reverses, setting North past Mumbles Hd towards Swansea. Keep seaward of Mixon Shoal. When North of SW Inner Green Grounds (SWIGG) SCM It buoy, Q (6) + LFI 15s keep to West of dredged channel and clear of commercial ships. Yachts must motor in harbour and approach, maximum speed 4 knots.

Installations
COORDINATES
51.61635 N, -3.93418 E
Port Information
Weather Forecast
Wed
1PM - 5PM
13 May 2026
- NW 16 knots. Gusts up to 26 knots.
- 13°C
- Sunny
Wed
5PM - 9PM
13 May 2026
- NW 16 knots decreasing to 10 knots. Gusts up to 25 knots.
- Decreasing from 12 to 9°C
- W 0.8m at 5s period
- UV Index: 0 - Low
- Mostly fine
Wed
9PM - 5AM
13 May 2026
- NW 8–14 knots. Gusts up to 24 knots.
- 6 to 9°C
- W 0.6m at 6s period
- UV Index: 0 - Low
- Mostly fine