Flood Risk in London, United Kingdom
Risk Level: Extreme — Score 9/10
Live Flood alert status near London
Checking live flood alerts near London…
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Flood watch, flood advisory, flood warning or flash flood warning near London: what each means
The National Weather Service flood products, from least to most urgent. The live status above shows which, if any, is in effect within 300 km of London.
Flood Watch
Conditions favor flooding or flash flooding, usually within the next 48 hours and for river flooding sometimes several days ahead. Flooding is possible, not certain. Review your routes and be ready to act.
Flood Advisory
Minor or nuisance flooding is expected or occurring, such as water ponding on roads or small streams edging out of their banks. An inconvenience rather than a threat to life if you avoid flooded roads.
Flood Warning
Flooding is imminent or occurring, usually from rivers or streams rising over hours to days. Never drive through flooded roads; move to higher ground if told to.
Flash Flood Warning
Rapid, life-threatening flooding is imminent or occurring, usually within 6 hours of heavy rain or a dam or levee failure. Move to higher ground immediately. A Flash Flood Emergency is the rare top tier for catastrophic flooding.
River flood products are tied to official flood stages at specific gauges, so a warning can be in effect for one river reach and not the next. Coastal flooding has its own Coastal Flood Advisory, Watch and Warning.
Live flood map around London
Shows flood warnings and events that are active right now, refreshed through the day. When none are active, the map is empty by design.
Key Risk Factors
- High risk rating for London based on ThinkHazard (Coastal flood)
- 33 events recorded in proximity in recent decades
- 2 event(s) in the 12 months to Aug 9, 2026
- Largest recent event exposed 15,200,000 people
- Significant river or coastal flood exposure
Peak season: March-September
Last significant event: Flood - London, England, United Kingdom (2026-01-04) — 15,200,000 people exposed
Highest Risk Cities for Floods
How London Compares
Notable Flood Events Near London
DisasterAWARE's historical archive records 5 notable flood events near London, ranked below by impact. The most impactful: Flood - London, England, United Kingdom (January 2026) — 15,200,000 people exposed; $3,014,398M capital exposed.
Flood - London, England, United Kingdom
January 4, 2026 — WATCH
15,200,000 people exposed; $3,014,398M capital exposed
Floods - England, United Kingdom
July 26, 2021 — WARNING
Impact data not available
Floods - South-central England, United Kingdom
December 29, 2020 — WARNING
Impact data not available
Floods - Southeast England, United Kingdom
July 20, 2018 — WARNING
Impact data not available
Floods - Anglian Region, United Kingdom
November 24, 2014 — WARNING
Impact data not available
Flood Preparedness Tips
- 1.Know if your property is in a flood zone — check FEMA maps
- 2.Consider flood insurance even if not in a high-risk zone
- 3.Never drive through flooded roadways — Turn Around, Don’t Drown
- 4.Move valuables and important documents to upper floors
- 5.Install sump pumps and check valves in plumbing
Related Pages
How this data is built
London, United Kingdom flood risk combines Historical Event Intelligence with authoritative hazard modeling from the Geospatial Intelligence Layers catalog. Live flood monitoring is available through the Event Intelligence API and the DisasterAWARE Platform.
The data behind this page
Every score and event here comes from DisasterAWARE's hazard database — available as downloadable historical datasets and a real-time API.
Monitor Flood Risk in Real Time
Get real-time flood alerts for London, United Kingdom and hundreds of other locations with DisasterAWARE's enterprise platform.