National Network of Regional Coastal Monitoring Programmes

« Dychwelid at fap am donau, llanw a gorsafoedd tywydd eraill.

Note that these are real-time data and are not quality-controlled. Long-range graphs are plotted from a randomised subsample of half-hourly data.

Second Severn Crossing

Tide Levels and Harmonics

 

 Blaenorol
Nesaf


Data llanw diweddaraf (Predicted Tide Table)

Amser (ASG)CodiadGweddill
18-01-2026 20:3010.97-0.08
 Penllanw nesafDistyll nesaf
07:41, 12.45 01:58, 2.05
Dyddiad Uchaf 2026 Dyddiad Isaf 2026
06-01 13.49m 06-01 0.83m
Amser (ASG)CodiadGweddill
18-01-2026 20:3010.97-0.08
18-01-2026 20:2011.30.01
18-01-2026 20:1011.570.06
18-01-2026 20:0011.810.12
18-01-2026 19:50120.17
18-01-2026 19:4012.140.21
18-01-2026 19:3012.210.23
18-01-2026 19:2012.220.23
18-01-2026 19:1012.160.21
18-01-2026 19:0012.050.18
18-01-2026 18:5011.880.15
18-01-2026 18:4011.690.13
18-01-2026 18:3011.440.1
18-01-2026 18:2011.190.1
18-01-2026 18:1010.90.09
18-01-2026 18:0010.580.09
18-01-2026 17:5010.250.09
18-01-2026 17:409.910.11
18-01-2026 17:309.540.11
18-01-2026 17:209.180.14
18-01-2026 17:108.80.15
18-01-2026 17:008.410.16
18-01-2026 16:507.990.15
18-01-2026 16:407.590.16
18-01-2026 16:307.20.18
18-01-2026 16:206.80.2
18-01-2026 16:106.430.24
18-01-2026 16:006.040.26
18-01-2026 15:505.680.31
18-01-2026 15:405.350.37
18-01-2026 15:305.010.42
18-01-2026 15:204.640.42
18-01-2026 15:104.250.38
18-01-2026 15:003.830.29
18-01-2026 14:503.420.18
18-01-2026 14:403.040.07
18-01-2026 14:302.72-0.02
18-01-2026 14:202.41-0.13
18-01-2026 14:102.06-0.33
18-01-2026 14:001.8-0.47
18-01-2026 13:501.7-0.5
18-01-2026 13:401.71-0.46
18-01-2026 13:301.78-0.41
18-01-2026 13:201.89-0.35
18-01-2026 13:102.03-0.3
18-01-2026 13:002.18-0.26
18-01-2026 12:502.39-0.2
18-01-2026 12:402.58-0.19
18-01-2026 12:302.8-0.17
18-01-2026 12:203.03-0.16
18-01-2026 12:103.27-0.15
18-01-2026 12:003.54-0.13
18-01-2026 11:503.82-0.11
18-01-2026 11:404.08-0.11
18-01-2026 11:304.36-0.11
18-01-2026 11:204.63-0.13
18-01-2026 11:104.93-0.13
18-01-2026 11:005.21-0.16
18-01-2026 10:505.51-0.17
18-01-2026 10:405.8-0.21
18-01-2026 10:306.1-0.24
18-01-2026 10:206.41-0.27
18-01-2026 10:106.72-0.31
18-01-2026 10:007.04-0.35
18-01-2026 09:507.37-0.38
18-01-2026 09:407.69-0.42
18-01-2026 09:308.02-0.45
18-01-2026 09:208.35-0.48
18-01-2026 09:108.71-0.47
18-01-2026 09:009.06-0.47
18-01-2026 08:509.44-0.44
18-01-2026 08:409.8-0.4
18-01-2026 08:3010.15-0.36
18-01-2026 08:2010.49-0.3
18-01-2026 08:1010.82-0.24
18-01-2026 08:0011.14-0.16
18-01-2026 07:5011.43-0.08
18-01-2026 07:4011.65-0.04
18-01-2026 07:3011.850.03
18-01-2026 07:2012.010.09
18-01-2026 07:1012.10.13
18-01-2026 07:0012.140.15
18-01-2026 06:5012.10.15
18-01-2026 06:4012.020.14
18-01-2026 06:3011.890.12
18-01-2026 06:2011.710.1
18-01-2026 06:1011.510.11
18-01-2026 06:0011.280.11
18-01-2026 05:5011.030.13
18-01-2026 05:4010.740.13
18-01-2026 05:3010.410.13
18-01-2026 05:2010.070.12
18-01-2026 05:109.710.12
18-01-2026 05:009.340.13
18-01-2026 04:508.950.12
18-01-2026 04:408.540.1
18-01-2026 04:308.120.07
18-01-2026 04:207.690.05
18-01-2026 04:107.270.03
18-01-2026 04:006.880.04
18-01-2026 03:506.50.06
18-01-2026 03:406.150.11
18-01-2026 03:305.770.12
18-01-2026 03:205.430.17
18-01-2026 03:105.090.19
18-01-2026 03:004.730.19
18-01-2026 02:504.360.17
18-01-2026 02:403.980.11
18-01-2026 02:303.620.04
18-01-2026 02:203.27-0.04
18-01-2026 02:102.97-0.11
18-01-2026 02:002.73-0.15
18-01-2026 01:502.46-0.26
18-01-2026 01:402.23-0.36
18-01-2026 01:302.07-0.45
18-01-2026 01:202.02-0.45
18-01-2026 01:102.02-0.44
18-01-2026 01:002.09-0.4
18-01-2026 00:502.19-0.36
18-01-2026 00:402.33-0.32
18-01-2026 00:302.49-0.29
18-01-2026 00:202.66-0.27
18-01-2026 00:102.86-0.24
18-01-2026 00:003.08-0.21
17-01-2026 23:503.31-0.19
17-01-2026 23:403.55-0.16
17-01-2026 23:303.79-0.15
17-01-2026 23:204.06-0.14
17-01-2026 23:104.32-0.13
17-01-2026 23:004.59-0.13
17-01-2026 22:504.87-0.13
17-01-2026 22:405.14-0.15
17-01-2026 22:305.42-0.16
17-01-2026 22:205.7-0.19
17-01-2026 22:106-0.21
17-01-2026 22:006.3-0.23
17-01-2026 21:506.6-0.26
17-01-2026 21:406.9-0.29
17-01-2026 21:307.22-0.31
17-01-2026 21:207.53-0.34
17-01-2026 21:107.84-0.37
17-01-2026 21:008.16-0.38
17-01-2026 20:508.51-0.36
17-01-2026 20:408.86-0.34
17-01-2026 20:309.21-0.3
17-01-2026 20:209.55-0.26
17-01-2026 20:109.89-0.2
17-01-2026 20:0010.21-0.15
17-01-2026 19:5010.51-0.09
17-01-2026 19:4010.8-0.01
17-01-2026 19:3011.030.03
17-01-2026 19:2011.230.07
17-01-2026 19:1011.40.12
17-01-2026 19:0011.540.17
17-01-2026 18:5011.630.21
17-01-2026 18:4011.670.24
17-01-2026 18:3011.660.25
17-01-2026 18:2011.60.26
17-01-2026 18:1011.510.27
17-01-2026 18:0011.370.27
17-01-2026 17:5011.20.28
17-01-2026 17:40110.29
17-01-2026 17:3010.790.32
17-01-2026 17:2010.540.33
17-01-2026 17:1010.250.33
17-01-2026 17:009.960.34
17-01-2026 16:509.650.36
17-01-2026 16:409.320.37
17-01-2026 16:308.980.37
17-01-2026 16:208.640.38
17-01-2026 16:108.280.38
17-01-2026 16:007.930.39
17-01-2026 15:507.570.39
17-01-2026 15:407.210.39
17-01-2026 15:306.860.41
17-01-2026 15:206.520.43
17-01-2026 15:106.190.46
17-01-2026 15:005.830.47
17-01-2026 14:505.520.5
17-01-2026 14:405.180.5
17-01-2026 14:304.820.46
17-01-2026 14:204.450.4
17-01-2026 14:104.080.31
17-01-2026 14:003.710.2
17-01-2026 13:503.350.07
17-01-2026 13:403.07-0.02
17-01-2026 13:302.8-0.13
17-01-2026 13:202.54-0.27
17-01-2026 13:102.34-0.38
17-01-2026 13:002.24-0.42
17-01-2026 12:502.24-0.41
17-01-2026 12:402.31-0.36
17-01-2026 12:302.39-0.33
17-01-2026 12:202.53-0.28
17-01-2026 12:102.68-0.24
17-01-2026 12:002.87-0.19
17-01-2026 11:503.06-0.15
17-01-2026 11:403.27-0.13
17-01-2026 11:303.48-0.11
17-01-2026 11:203.68-0.11
17-01-2026 11:103.94-0.08
17-01-2026 11:004.19-0.07
17-01-2026 10:504.43-0.07
17-01-2026 10:404.69-0.06
17-01-2026 10:304.94-0.07
17-01-2026 10:205.19-0.1
17-01-2026 10:105.48-0.1
17-01-2026 10:005.76-0.12
17-01-2026 09:506.06-0.13
17-01-2026 09:406.34-0.17
17-01-2026 09:306.63-0.2
17-01-2026 09:206.92-0.24
17-01-2026 09:107.23-0.27
17-01-2026 09:007.53-0.3
17-01-2026 08:507.84-0.32
17-01-2026 08:408.15-0.35
17-01-2026 08:308.49-0.34
17-01-2026 08:208.83-0.32
17-01-2026 08:109.17-0.28
17-01-2026 08:009.51-0.23
17-01-2026 07:509.85-0.17
17-01-2026 07:4010.17-0.11
17-01-2026 07:3010.47-0.04
17-01-2026 07:2010.760.03
17-01-2026 07:1011.020.11
17-01-2026 07:0011.230.16
17-01-2026 06:5011.410.22
17-01-2026 06:4011.560.27
17-01-2026 06:3011.670.33
17-01-2026 06:2011.740.38
17-01-2026 06:1011.760.41
17-01-2026 06:0011.720.42
17-01-2026 05:5011.630.42
17-01-2026 05:4011.510.43
17-01-2026 05:3011.360.43
17-01-2026 05:2011.170.43
17-01-2026 05:1010.940.42
17-01-2026 05:0010.70.42
17-01-2026 04:5010.430.42
17-01-2026 04:4010.120.39
17-01-2026 04:309.790.37
17-01-2026 04:209.460.36
17-01-2026 04:109.120.34
17-01-2026 04:008.780.34
17-01-2026 03:508.440.34
17-01-2026 03:408.070.31
17-01-2026 03:307.720.31
17-01-2026 03:207.380.31
17-01-2026 03:107.040.32
17-01-2026 03:006.70.32
17-01-2026 02:506.390.35
17-01-2026 02:406.060.37
17-01-2026 02:305.740.37
17-01-2026 02:205.450.4
17-01-2026 02:105.130.39
17-01-2026 02:004.830.38
17-01-2026 01:504.530.35
17-01-2026 01:404.210.28
17-01-2026 01:303.90.2
17-01-2026 01:203.610.1
17-01-2026 01:103.360.02
17-01-2026 01:003.13-0.07
17-01-2026 00:502.92-0.18
17-01-2026 00:402.74-0.29
17-01-2026 00:302.64-0.36
17-01-2026 00:202.61-0.39
17-01-2026 00:102.63-0.4
17-01-2026 00:002.7-0.39
16-01-2026 23:502.81-0.37
16-01-2026 23:402.94-0.34
16-01-2026 23:303.09-0.32
16-01-2026 23:203.28-0.28
16-01-2026 23:103.48-0.24
16-01-2026 23:003.69-0.21
16-01-2026 22:503.92-0.17
16-01-2026 22:404.14-0.15
16-01-2026 22:304.39-0.11
16-01-2026 22:204.62-0.1
16-01-2026 22:104.89-0.07
16-01-2026 22:005.12-0.08
16-01-2026 21:505.4-0.06
16-01-2026 21:405.66-0.06
16-01-2026 21:305.94-0.06
16-01-2026 21:206.21-0.07
16-01-2026 21:106.49-0.08
16-01-2026 21:006.77-0.09
16-01-2026 20:507.06-0.1
16-01-2026 20:407.35-0.11
16-01-2026 20:307.64-0.12
16-01-2026 20:207.96-0.12
16-01-2026 20:108.25-0.11