DisasterAWARE
9
Extreme

flood Flood Risk in Johannesburg, South Africa

Risk Level: Extreme — Score 9/10

Risk: 9Historical: 6

Live Flood alert status near Johannesburg

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Live flood map around Johannesburg

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Key Risk Factors

  • High risk rating for Johannesburg based on ThinkHazard (River flood)
  • 13 events recorded in proximity in recent decades
  • 1 event(s) in the last 12 months
  • 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

1
New York, NY
FEMA: 9Historical: 10
2
Los Angeles, CA
FEMA: 9Historical: 10
3
Chicago, IL
FEMA: 9Historical: 10
4
Houston, TX
FEMA: 9Historical: 10
5
Phoenix, AZ
FEMA: 9Historical: 10
6
Philadelphia, PA
FEMA: 9Historical: 10
7
San Antonio, TX
FEMA: 9Historical: 10
8
San Diego, CA
FEMA: 9Historical: 10
9
Dallas, TX
FEMA: 9Historical: 10
10
San Jose, CA
FEMA: 9Historical: 10
Johannesburg is not in the top 10 for flood risk among tracked cities.

How Johannesburg Compares

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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 17, 2022 — WARNING

Impact data not available

Floods - Gauteng Province, South Africa

February 5, 2022 — WARNING

Impact data not available

Floods - South Africa

November 23, 2020 — WARNING

Impact data not available

Floods - South Africa

February 9, 2020 — WARNING

Impact data not available

Floods - South Africa

December 8, 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

earthquake
Earthquake Risk in Johannesburg
Score: 1/10
wildfire
Wildfire Risk in Johannesburg
Score: 9/10
hurricane
Hurricane Risk in Johannesburg
Score: 3/10
tornado
Tornado Risk in Johannesburg
Score: 0/10
winter-storm
Winter Storm Risk in Johannesburg
Score: 0/10
landslide
Landslide Risk in Johannesburg
Score: 1/10
extreme-heat
Extreme Heat Risk in Johannesburg
Score: 9/10
drought
Drought Risk in Johannesburg
Score: 1/10
high-wind
High Wind Risk in Johannesburg
Score: 0/10
tsunami
Tsunami Risk in Johannesburg
Score: 0/10
flood
Flood Risk in Cape Town, South Africa
Score: 5/10
flood
Flood Risk in Nairobi, Kenya
Score: 3/10
flood
Flood Risk in Lagos, Nigeria
Score: 9/10

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.

Historical flood event data for Johannesburg, South Africa — free dataset samples →Real-time flood alerts by API →

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