Mumbles tide gauge site

The tide gauge is located at Mumbles lifeboat station with the full tide pressure points mounted close to the end of the lifeboat slipway.
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Tide gauge location

The equipment is housed in a heated GRP cabinet within the lifeboat station with the full tide pressure point being mounted on steelwork attached to a concrete leg of the slipway and the mid-tide pressure point mounted on steelwork directly below the lifeboat station. All three pressure lines are monitored by the POL data logger.

Tide gauge location The tide gauge is levelled to the tide gauge bench mark suppored by Ordnance Survey auxilary marks.

External users

Sea level pressures and/or elevations from this site are supplied to the following authority:

  • Environment Agency Wales / Asiantaeth yr Amgylchedd Cymru

Site history

1988 – DATARING system installed with two full-tide bubblers
1993 – Tide gauge removed due to refurbishment of the lifeboat station
1994 – DATARING system installed with two full-tide and a mid-tide bubblers
2001 – POL data logger installed connected to the two full-tide measuring systems
2007 – The mid-tide sensor was connected to the POL data logger

Latitude51° 34.203'N
Longitude3° 58.534'W
Grid refSS 6319 8753
Earliest data1988
Tidal levels
HAT10.51 m
LAT0.14 m
MHWS9.54 m
MHWN7.28 m
MLWN3.25 m
MLWS1.08 m
H for 2024 10.43 m
L for 2024 0.17 m
H for 2025 10.27 m
L for 2025 0.30 m
MSR8.46 m
MNR4.03 m

HAT – highest astronomical tide
LAT – lowest astronomical tide
MHWS – mean high water springs
MHWN – mean high water neaps
MLWN – mean low water neaps
MLWS – mean low water springs
H – highest for year
L – lowest for year
MSR – mean spring range
MNR – mean neap range

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