Flood Risk in Johannesburg, South Africa
Risk Level: Extreme — Score 9/10
Live Flood alert status near Johannesburg
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Flood watch, flood advisory, flood warning or flash flood warning near Johannesburg: 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 Johannesburg.
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 Johannesburg
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 Johannesburg based on ThinkHazard (River flood)
- 10 events on record in proximity
- Significant river or coastal flood exposure
Peak season: March-September
Last significant event: Floods - Gauteng Province, South Africa (2022-02-18)
Highest Risk Cities for Floods
How Johannesburg Compares
Notable Flood Events Near Johannesburg
DisasterAWARE's historical archive records 5 notable flood events near Johannesburg, ranked below by impact. The most impactful: Floods - Gauteng Province, South Africa (February 2022).
Floods - Gauteng Province, South Africa
February 18, 2022 — WARNING
Impact data not available
Floods - Gauteng Province, South Africa
February 6, 2022 — WARNING
Impact data not available
Floods - South Africa
November 24, 2020 — WARNING
Impact data not available
Floods - South Africa
February 10, 2020 — WARNING
Impact data not available
Floods - South Africa
December 9, 2019 — 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
Johannesburg, South Africa 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.
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