A Flood Alert was issued for Tidal Thames riverside from the Thames Barrier to Putney Bridge in City of London, Greater London, Greenwich, Hammersmith and Fulham, Kensington and Chelsea, Lambeth, Lewisham, Newham, Southwark, Tower Hamlets, Wandsworth, Westminster on 25th October 2026. Affected watercourses included the River Thames.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Thames at Sunbury Lock rose 3.34m, peaking at 0.36m, while the River Thames at Thames Ditton Island climbed 0.37m.
Environment Agency advice issued
High tides overnight may lead to flooding. Flooding is possible from 10:45 PM to 2:45 AM on 26/10/2026. The forecast high tide at London Bridge is 4.50 mAOD at 00:45 AM on 26/10/2026. We believe there is a possibility of flooding for Custom House (EC3R), Narrow Street (E14), Mayflower and Angel pubs (SE16), Royal Naval College riverfront, the Almshouse Slipway at Crane Street (SE10), Bankside by the Tate Modern (SE1), and Three Mill Island (E3). Flooding of properties is not expected. Astronomical tide levels are rising. The river flow at Teddington Weir is 20 cubic metres per second and is
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Sunbury Lock | River Thames | +3.34m | 0.36m |
| Thames Ditton Island | River Thames | +0.37m | 4.80m |
| Kingston | River Thames | +0.27m | 4.74m |
| Teddington Lock | River Thames | +0.22m | 0.29m |
| Trowlock Island | River Thames | +0.22m | 4.73m |
| Molesey Lock | River Thames | +0.17m | 0.36m |
| Shepperton Lock | River Thames | +0.16m | 0.30m |
| Walton | River Thames | +0.11m | 3.46m |