Does Isleworth flood?

Flood warnings in force near Isleworth

• Flood alert — Tidal Thames riverside from Putney Bridge to Teddington Weir
  Flooding is possible from 11:45 AM to 3:45 PM on 26/10/2026 2.7 km

From the Environment Agency (England). Always check the GOV.UK Check for Flooding service or call Floodline on 0345 988 1188.

What the Environment Agency's rivers-and-sea flood-risk data says about Isleworth

Ordnance Survey places 52 postcodes in Isleworth in the Environment Agency's rivers-and-sea flood-risk dataset (Risk of Flooding from Rivers and Sea). Each postcode is counted once, under the worst band any of its properties reaches; together they hold 561 properties in the EA dataset's likelihood bands.

This dataset covers flooding from rivers and the sea only — one of five flood sources. Surface water, groundwater, sewers and reservoirs are assessed separately, so a postcode missing from it is not proof that a place cannot flood. The band describes the land around properties (allowing for defences), not any single address and not today's conditions.

Rivers and live river levels near Isleworth

Environment Agency gauges within 10 km of Isleworth watch Thames Tideway, River Brent, River Crane, River Thames, Beverley Brook, Hogsmill River.

• Richmond Tidal
  Thames Tideway · 0.7 km away 4.44 mAOD
  rises and falls with the tide · 34 min ago
• Brentford Tidal
  River Brent · 2.1 km away 1.60 m
  rises and falls with the tide · 1 h ago
• Marsh Farm
  River Crane · 2.2 km away 0.16 m
  normal range · 34 min ago
• Teddington Lock Structure
  River Thames · 4.0 km away 0.23 m
  controlled by a sluice or weir · 34 min ago
• Trowlock Island
  River Thames · 4.8 km away 4.70 mAOD
  normal range · rising · 34 min ago
• Hanwell
  River Brent · 4.9 km away 0.88 m
  normal range · 34 min ago
• Barnes
  Beverley Brook · 5.6 km away 1.42 m
  normal range · 34 min ago
• Kingston
  River Thames · 5.7 km away 4.67 m
  normal range · rising · 34 min ago
• Wimbledon Common
  Beverley Brook · 6.3 km away 0.23 m
  normal range · rising · 34 min ago
• Cranford Park
  River Crane · 6.5 km away 0.14 m
  normal range · 34 min ago
• Molesey Lock Structure
  River Thames · 6.8 km away 0.30 m
  controlled by a sluice or weir · 34 min ago
• Kingston Hogsmill
  Hogsmill River · 6.9 km away 0.19 m
  normal range · just past its peak · 34 min ago

Distances are from the middle of Isleworth's at-risk postcodes. Tidal and structure gauges are shown as readings only — the tide and sluice gates move them, not floods. A gauge with no recent reading shows no level.

Flood warning areas near Isleworth

55 Environment Agency flood warning areas lie within 10 km of Isleworth. The EA has issued 1,448 flood warnings and alerts for them since 2006, most recently on 26 Oct 2026.

• The Tidal River Crane at Isleworth
  no warning on record since 2006 0.3 km
• The Tidal River Crane at Twickenham
  69 warnings and alerts since 2006, latest Feb 2026 0.3 km
• River Thames from the River Brent to the River Crane including East Isleworth and Syon Park
  no warning on record since 2006 1.3 km
• River Thames from the River Crane to Teddington Weir including St. Margaret's, Eel Pie Island, Strawberry Hill and East Teddington
  no warning on record since 2006 2.0 km
• The Tidal River Brent at Brentford
  no warning on record since 2006 2.2 km
• The Tidal River Brent in Hounslow
  1 warning or alert since 2006, latest Nov 2020 2.2 km
• River Thames from Richmond Bridge to Teddington Weir including West Petersham and Ham Lands
  no warning on record since 2006 2.4 km
• River Thames from Mortlake High Street East to Richmond Bridge including Mortlake, North Sheen, Kew, the Royal Botanic Gardens and Old Deer Park
  no warning on record since 2006 2.5 km
• River Thames riverside from Putney Bridge to Teddington Weir
  926 warnings and alerts since 2006, latest Oct 2026 2.7 km
• The River Crane at Twickenham including Cole Park
  no warning on record since 2006 3.2 km
• River Thames including areas in the boroughs of Wandsworth and Richmond-upon-Thames
  2 warnings and alerts since 2006, latest Feb 2008 3.8 km
• River Thames from the Hogarth Lane Roundabout to the River Brent including South Chiswick, Grove Park, Strand-on-the-Green and Brentford
  no warning on record since 2006 4.3 km

Recorded floods near Isleworth

Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of Isleworth, most recent first. Records, not floods: no outline on the record is not evidence a place has not flooded. See them on the map →

• 29 Jan 2021 — ea06JanuaryWinter2021
• 9 Mar 2020 — ea06MarchSpring2020 Main river
• 23 Nov 2013 — Winter 2013/2014 Other
• 1 Jan 2003 — 06JanuaryNewYear2003
• 23 Dec 2002 — 06JanuaryNewYear2003 Main river
• 31 Oct 2000 — 06DecemberWinter2000 Main river
• 1 Jan 2000 — 06DecemberWinter2000 Main river
• 1 Jan 1999 — 06JanuaryWinter1999 Main river
• 1 Feb 1990 — 06FebruaryWinter1990 Main river
• 1 Jan 1988 — 06MaySpring1988 Other
• 14 Sep 1968 — 06SeptemberAutumn1968 Main river
• 1 Jan 1965 — 06NovemberWinter1965 Main river

…and 1 earlier recorded flood on the map.

Rainfall near Isleworth

Isleworth gets about 624 mm of rain a year on average (wettest month November, 68 mm; driest March, 39 mm). That is 46% drier than the UK as a whole, which averages 1,163 mm a year. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 2.3 km from the place centre.

The nearest rain gauge, Rainfall station (3.9 km away), recorded 2.6 mm in the last 24 hours and 73.9 mm in the last 7 days (latest reading 34 min ago).

At-risk postcodes in Isleworth

Every postcode Ordnance Survey places in Isleworth that appears in the EA's rivers-and-sea dataset, worst band first. Each links to its own flood-risk page.

High likelihood (7)

Medium likelihood (2)

Low likelihood (31)

Very low likelihood (12)

Postcode districts

Sources

FloodRadar summarises public flood data. It is not a flood-risk survey of any property, and it does not replace official GOV.UK flood warnings or the GOV.UK long-term flood risk service.