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Download the tides for 2026 and never miss the tide !
Datum of predictions add 2.9m to tide height.
Add 1hr for British Summer time from the 29th of March to the 24th of October (highlighted in yellow)
Brief Explanation of Tides & Tables
The New Moon is shown as and Full Moon is shown as .
In the tide tables, you will notice blanks at certain intervals. This is
because there is no high/low tide in that particular 12 hour period, but
it will occur late in the previous 12 hours or early in the next.
Weather conditions which differ from the average will have an effect
on the differences between predicted and actual tide times. Strong
winds can push the tide in or hold the tide out. Barometric pressure
can cause fluctuations in predicted levels.
The moon, being nearer to the earth than the sun, is the principal cause
of tides. Spring tides occur after a New and Full moon, when the sun,
moon and earth are directly in line and the solar and lunar waves
coincide, as the moon exerts its powerful gravitational pull on the
water, which rises above its normal level.
Water covering the earth furthest from the moon is also subject to this
pull, so another distinct dome of water is formed on the other side of
the earth providing the basis for the second wave. When the sun is at
right angles to the moon - now in its first or third quarter, Neap tides
are formed. Both the Springs and the Neaps occur 48-60 hours after
the corresponding phases of the moon.In most parts of the world there
are two high and two low tides every lunar day - which is 24 hours 50
minutes and 28 seconds.
2026 Tidal Variations
The following are approximate tidal variations
Standard port Swansea
Sennen (Cornwall)...................... - 1hr 41mins
Newquay (Cornwall).................. - 1hr 10mins
Clovelly (Devon) .............................. - 35 mins
Ilfracombe (Devon).......................... - 25 mins
Pembrey.......................................... + 10 mins
Cardiff.............................................. + 27 mins
Milford Haven.................................... - 8 mins
Aberystwyth............................ + 1 hr 30mins
Porthcawl.......................................... + 3 mins
The main tide information in these tide tables is for Swansea.
The reference: HEIGHTS ARE ABOVE CHART DATUM; In tidal prediction terms, the statement
is used because it is a height which is required to be added to depths given on Admiralty
Charts (which tide tables are mostly used in conjunction with) which themselves are referred
to CHART DATUM. At the position on the SWANSEA chart which has a depth given of 0.5m,
on 01/01/15 at the 1st HW (0250hrs), there will be a predicted depth of 8.3m (since 0.5m +
7.8m), and at the 1st LW (0910hrs), there will be a predicted depth of 2.9m (since 0.5m +
2.4m) In the above 2 examples, the predicted depths with the 2.8m added would then be:
1st HW 11.1m; and 1st LW 5.7m.
Download the tides for 2026 and never miss the tide !
Datum of predictions add 2.9m to tide height.
Add 1hr for British Summer time from the 29th of March to the 24th of October (highlighted in yellow)
Brief Explanation of Tides & Tables
The New Moon is shown as and Full Moon is shown as .
In the tide tables, you will notice blanks at certain intervals. This is
because there is no high/low tide in that particular 12 hour period, but
it will occur late in the previous 12 hours or early in the next.
Weather conditions which differ from the average will have an effect
on the differences between predicted and actual tide times. Strong
winds can push the tide in or hold the tide out. Barometric pressure
can cause fluctuations in predicted levels.
The moon, being nearer to the earth than the sun, is the principal cause
of tides. Spring tides occur after a New and Full moon, when the sun,
moon and earth are directly in line and the solar and lunar waves
coincide, as the moon exerts its powerful gravitational pull on the
water, which rises above its normal level.
Water covering the earth furthest from the moon is also subject to this
pull, so another distinct dome of water is formed on the other side of
the earth providing the basis for the second wave. When the sun is at
right angles to the moon - now in its first or third quarter, Neap tides
are formed. Both the Springs and the Neaps occur 48-60 hours after
the corresponding phases of the moon.In most parts of the world there
are two high and two low tides every lunar day - which is 24 hours 50
minutes and 28 seconds.
2026 Tidal Variations
The following are approximate tidal variations
Standard port Swansea
Sennen (Cornwall)...................... - 1hr 41mins
Newquay (Cornwall).................. - 1hr 10mins
Clovelly (Devon) .............................. - 35 mins
Ilfracombe (Devon).......................... - 25 mins
Pembrey.......................................... + 10 mins
Cardiff.............................................. + 27 mins
Milford Haven.................................... - 8 mins
Aberystwyth............................ + 1 hr 30mins
Porthcawl.......................................... + 3 mins
The main tide information in these tide tables is for Swansea.
The reference: HEIGHTS ARE ABOVE CHART DATUM; In tidal prediction terms, the statement
is used because it is a height which is required to be added to depths given on Admiralty
Charts (which tide tables are mostly used in conjunction with) which themselves are referred
to CHART DATUM. At the position on the SWANSEA chart which has a depth given of 0.5m,
on 01/01/15 at the 1st HW (0250hrs), there will be a predicted depth of 8.3m (since 0.5m +
7.8m), and at the 1st LW (0910hrs), there will be a predicted depth of 2.9m (since 0.5m +
2.4m) In the above 2 examples, the predicted depths with the 2.8m added would then be:
1st HW 11.1m; and 1st LW 5.7m.