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No official flood warning is active nearby and the closest river stations are within normal ranges.
Updated 2026-10-08 04:45:54 UTC · Official GOV.UK warnings · Flood preparation & help guide
Merton is an area in the London Borough of Merton. Merton was an ancient parish historically in Surrey, the area of which has since 1965 been part of Greater London. The parish was centred on the 12th-century parish church of St Mary in Merton Park. In 1907 the parish became Merton Urban District. On 1 April 1965 the civil parish was abolished. At the 1951 census, Merton had a population of 39,313. The area has formed part of the London Borough of Merton since 1965.
Towns and villages near Merton with a page of their own: the homes in a flood risk area there, the nearest river gauges, and recorded floods.
Wimbledon · Fulham · Clapham · Chelsea · Chiswick · Surbiton · Croydon · Hammersmith
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 the River Wandle, about 130 m from the middle of Merton's gauges. It flows into the River Thames (Battersea Reach) about 5.1 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 the River Wandle nearest the middle of Merton'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.
Merton is monitored by 4 Environment Agency river level stations on the River Graveney, the River Wandle, in Greater London. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Graveney is monitored by 1 station (Longley Road). The River Wandle is monitored by 3 stations (Summerstown, Wandle Park Main Channel, Wandle Park Side Channel). 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 Merton. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: River Wandle at Wimbledon including Colliers Wood, Merton Abbey, Connollys Mill, Summerstown and Wimbledon Stadium, London Borough of Merton; River Graveney at Tooting and Colliers Wood, London Boroughs of Wandsworth and Merton; River Wandle area in the London Boroughs of Wandsworth, Merton, Lambeth, Croydon and Sutton. Including the Norbury Brook from Thornton Heath to Tooting; River Wandle at Morden, including Morden Hall Park, London Borough of Merton.
There are 30 storm overflows within 5km of Merton. None of the 29 with a reporting monitor are currently discharging (1 has 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 Merton, 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.
Merton gets about 610 mm of rain a year on average (wettest month October, 67 mm; driest March, 36 mm). That is 48% 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), 1.9 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.
Merton has river level monitoring on River Graveney, River Wandle — 4 monitoring stations 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.
No recorded flood outline is mapped around the Merton town centre means no flood was mapped here, which is not evidence none happened: the Environment Agency mapped only some floods, mapping effort rose sharply after about 2000, and surface-water flooding is largely absent from this record. FloodRadar has separately logged 10 flood warnings or alerts for the Greater London area since February 2026. See the flood history link below.
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