A Flood Alert was issued for Tidal Thames riverside from Putney Bridge to Teddington Weir in Greater London, Hammersmith and Fulham, Hounslow, Richmond upon Thames, Wandsworth on 11th September 2026. Affected watercourses included the River Thames.
During this event, FloodRadar monitoring gauges recorded notable rises. The River Thames at Sunbury Lock rose 3.32m, peaking at 0.30m, while the River Thames at Trowlock Island climbed 0.21m.
Environment Agency advice issued
High tides tomorrow morning may lead to flooding. Flooding is possible from 02:15 AM to 06:15 AM on 12/09/2026. The forecast high tide at Richmond is 4.60 mAOD at 4:15 AM on 12/09/2026. We believe there is a possibility of flooding for Putney Embankment (SW15), Chiswick Mall and Strand on the Green (W4), Thames Bank at Mortlake (SW14), Ranelagh Drive (TW1), Friars Lane and Water Lane (TW9), Riverside and The Embankment at Twickenham, and the Towpath below Teddington Lock. Flooding of properties is not expected. Astronomical tide levels are rising. The river flow at Teddington Weir is 6 cubic
Monitoring gauges during this event
| Station | River | Rise | Peak |
|---|---|---|---|
| Sunbury Lock | River Thames | +3.32m | 0.30m |
| Trowlock Island | River Thames | +0.21m | 4.59m |
| Teddington Lock | River Thames | +0.18m | 0.19m |
| Kingston | River Thames | +0.18m | 4.53m |
| Thames Ditton Island | River Thames | +0.13m | 4.46m |
| Molesey Lock | River Thames | +0.13m | 0.19m |
| Shepperton Lock | River Thames | +0.10m | 0.15m |
| Penton Hook | River Thames | +0.08m | 0.19m |
| Staines | River Thames | +0.06m | 2.67m |