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Does Windsor flood? 258 postcodes in Windsor are in the Environment Agency's rivers-and-sea flood-risk data (19 High, 24 Medium likelihood) — the breakdown is further down this page.
Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Updated 2026-10-09 22:01:24 UTC · Official GOV.UK warnings · Flood preparation & help guide
Windsor is a historic town in the Royal Borough of Windsor and Maidenhead in Berkshire, England. It is home to Windsor Castle, one of the official residences of the British monarch. The town is located 21.8 miles (35.1 km) west of Charing Cross in central London, 5.8 miles (9.3 km) southeast of Maidenhead, and 15.8 miles (25.4 km) east of the modern county town of Reading. It lies immediately south of the River Thames, which forms its boundary with the smaller and historic town of Eton. The village of Old Windsor, just over 2 miles (3 km) to the south, predates what is now called Windsor by, possibly, 300 years. Until 1974, Windsor was sometimes officially referred to as New Windsor to distinguish the two.
Ordnance Survey places 258 postcodes in Windsor 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 4,459 properties in the EA dataset's likelihood bands.
| EA likelihood band | Postcodes (worst band) | Properties in the EA dataset | of which homes |
|---|---|---|---|
| High | 19 | 139 | 134 |
| Medium | 24 | 239 | 215 |
| Low | 179 | 3,418 | 3,046 |
| Very low | 36 | 663 | 574 |
| All bands | 258 | 4,459 | 3,969 |
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 158 more at-risk postcodes, listed on the district pages below.
Eton Wick · Slough · Wraysbury · Colnbrook · North Ascot · Bracknell
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 the River Thames, about 80 m from the middle of Windsor's gauges. It flows on to the sea.
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 Thames nearest the middle of Windsor'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.
Windsor is monitored by 1 Environment Agency river level station on the River Thames, in Buckinghamshire. Water levels are updated every 15 minutes, providing real-time flood monitoring for the area.
The River Thames is monitored by 1 station (Boveney Lock). 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 Windsor. When the EA issues a flood warning for any of these areas, it will appear on this page. These include: River Thames from Maidenhead down to Romney Lock including moorings on and those properties closest to the river; River Thames from Maidenhead to Windsor and Eton including Bray and Dorney; River Thames at Maidenhead, Bray, Dorney, Windsor and Eton; The Huntercombe Lane Stream, The Chalvey Ditch, The Salt Hill Stream and The Datchet Common Brook.
There are 2 storm overflows within 5km of Windsor. None has a live status right now, so whether any is discharging is not known. Enable "Sewage" on the map above to see their locations.
Each has its own page of live status and past discharges:
If flooding is forecast in Windsor, 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.
Windsor gets about 641 mm of rain a year on average (wettest month November, 72 mm; driest March, 41 mm). That is 45% 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: Watch. Conditions are worth watching: the Environment Agency has a Flood Alert in force for Tidal Thames riverside from Putney Bridge to Teddington Weir — flooding is possible from 02:15 AM to 04:15 AM on Saturday 10th October. Flooding is possible — be prepared and keep an eye on updates.
Windsor has river level monitoring on River Thames — 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 61 recorded flood extents around the town centre since 1703, most recently in 2002. 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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