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Does Stanmore flood? 102 postcodes in Stanmore are in the Environment Agency's rivers-and-sea flood-risk data (37 High, 22 Medium likelihood) — the breakdown is further down this page.
No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-09 13:00:20 UTC · Official GOV.UK warnings · Flood preparation & help guide
Stanmore is part of the London Borough of Harrow in Greater London. It is centred 11 miles (18 km) northwest of Charing Cross, lies on the outskirts of the London urban area and includes Stanmore Hill, one of the highest points of London, at 152 metres (499 ft) high. The district, which developed from the ancient Middlesex parishes of Great and Little Stanmore, lies immediately west of Roman Watling Street and forms the eastern part of the modern London Borough of Harrow.
Ordnance Survey places 102 postcodes in Stanmore 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 1,489 properties in the EA dataset's likelihood bands.
| EA likelihood band | Postcodes (worst band) | Properties in the EA dataset | of which homes |
|---|---|---|---|
| High | 37 | 400 | 360 |
| Medium | 22 | 302 | 247 |
| Low | 41 | 750 | 584 |
| Very low | 2 | 37 | 35 |
| All bands | 102 | 1,489 | 1,226 |
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.
…and 2 more at-risk postcodes, listed on the district pages below.
Harrow · Bushey · Ealing · Barnet · Hayes
Flood-risk bands: © Environment Agency copyright and/or database right 2025. All rights reserved. Some features of this map are based on digital spatial data from the Centre for Ecology & Hydrology, © NERC (CEH). © Crown Copyright and Database Rights 2025 OS AC0000807064. This product is produced in part from PAF® and Multiple Residence Data, the copyright in which is owned by Royal Mail Group Limited and/or Royal Mail Group plc. All rights reserved. Licence number AC0000807064.
Place names: Contains OS data © Crown copyright and database rights 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Contains National Statistics data © Crown copyright and database right 2026. Licensed under the Open Government Licence v3.0.
The nearest watercourse on the river map is Edgeware Brook, about 10 m from the middle of Stanmore's gauges. It flows into Silk Stream about 3.7 km downstream.
A gauge downstream shows water that has already passed this point; one upstream sees it first. Distances along the river are from the point on Edgeware Brook nearest the middle of Stanmore's gauges. From Ordnance Survey’s river map (OS Open Rivers), which leaves out small streams, ditches and culverts, so a nearer one may exist. This describes where water goes on the map; it says nothing about flooding at any address. Contains OS data © Crown copyright and database rights 2026.
Stanmore is monitored by 1 Environment Agency river level station on the Edgware Brook, in Greater London. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The Edgware Brook is monitored by 1 station (Stanmore, Wolverton Road). Each station records water levels continuously, with data synced to FloodRadar every 5 minutes.
There are 8 Environment Agency flood warning areas within 10km of Stanmore. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: The Edgware Brook at Stanmore including Little Stanmore; The Kenton Brook feeding into the Wealdstone Brook; The Wealdstone Brook at Kenton including Wealdstone and Wembley; The Deans Brook at Edgware.
There are 9 storm overflows within 5km of Stanmore. None of the 5 with a reporting monitor are currently discharging (4 have no live status right now). Enable "Sewage" on the map above to see their locations.
6 of them, nearest first, with their own page of live status and past discharges:
If flooding is forecast in Stanmore, call Floodline on 0345 988 1188 for the latest information. Move valuables upstairs, turn off gas and electricity if safe to do so, and avoid walking or driving through flood water. Sign up for flood warnings on any station page above to receive email alerts when water levels rise. For emergency numbers, a preparation checklist and insurance guidance, see our flood help & preparation guide.
Stanmore gets about 699 mm of rain a year on average (wettest month October, 78 mm; driest March, 42 mm). That is 40% drier than the UK as a whole, which averages 1,163 mm a year. See the rain gauges →
A thirty-year average for the area, not a forecast and not a flood risk on its own. Source: Met Office HadUK-Grid 1991–2020 (5 km grid), 1.1 km away. Average rainfall: HadUK-Grid v1.3.2, Met Office. Contains public sector information licensed under the Open Government Licence v3.0.
Floods whose mapped extent (EA Recorded Flood Outlines) reached within ~5 km of the town centre — most recent first. These are records of mapped extents, not a full list of floods. See them on the map →
Records, not floods: no outline on the record is not evidence a place has not flooded.
Current verdict: Normal. No official flood warning is active nearby and the closest river stations are within normal ranges.
Stanmore has river level monitoring on Edgware Brook — 1 monitoring station in total.
Use the GOV.UK Check for Flooding service (check-for-flooding.service.gov.uk) or call Floodline on 0345 988 1188 (24 hours). You can also set up free FloodRadar email or browser alerts from any station page above.
Follow official advice: move valuables and vehicles to safety, never walk or drive through flood water, turn off gas and electricity if safe, and check on vulnerable neighbours. See our flood preparation guide at floodradar.co.uk/flood-help.
Yes — the Environment Agency's Recorded Flood Outlines dataset shows 10 recorded flood extents around the town centre since 1703, most recently in 1988. That is a count of mapped extents, not of separate floods. Records, not floods: no outline on the record is not evidence a place has not flooded. See the flood history link below.
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