DisasterAWARE
9
Extreme

extreme-heat Extreme Heat Risk in Johannesburg, South Africa

Risk Level: Extreme — Score 9/10

Risk: 9Historical: 10

Live Extreme Heat alert status near Johannesburg

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Live extreme heat map around Johannesburg

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Key Risk Factors

  • High risk rating for Johannesburg based on ThinkHazard (Extreme heat)
  • 2 events on record in proximity
  • History of dangerous heat waves and extreme temperatures

Peak season: June-September

Last significant event: Extreme Heat - Southern Africa (2025-01-23) — 36,808,000 people exposed

Highest Risk Cities for Extreme Heat Events

1
Chicago, IL
FEMA: 9Historical: 10
2
Houston, TX
FEMA: 9Historical: 10
3
Phoenix, AZ
FEMA: 9Historical: 10
4
Philadelphia, PA
FEMA: 9Historical: 10
5
Dallas, TX
FEMA: 9Historical: 10
6
Las Vegas, NV
FEMA: 9Historical: 10
7
Tucson, AZ
FEMA: 9Historical: 10
8
Mesa, AZ
FEMA: 9Historical: 10
9
Mumbai, India
Risk: 9Historical: 10
10
Shanghai, China
Risk: 9Historical: 10
Johannesburg is not in the top 10 for extreme heat risk among tracked cities.

How Johannesburg Compares

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Notable Extreme Heat Events Near Johannesburg

DisasterAWARE's historical archive records 2 notable extreme heat events near Johannesburg, ranked below by impact. The most impactful: Extreme Heat - Southern Africa (January 2025) — 36,808,000 people exposed; $744,469M capital exposed.

Extreme Heat - Southern Africa

January 23, 2025 — WARNING

36,808,000 people exposed; $744,469M capital exposed

Extreme Heat - South Africa

December 24, 2020 — WARNING

Impact data not available

Extreme Heat Preparedness Tips

  • 1.Stay hydrated — drink water regularly even if you don’t feel thirsty
  • 2.Avoid outdoor activities during peak heat hours (10 AM – 4 PM)
  • 3.Know the signs of heat exhaustion and heat stroke
  • 4.Check on elderly neighbors and those without air conditioning
  • 5.Never leave children or pets in a parked vehicle

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
flood
Flood Risk in Johannesburg
Score: 9/10
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
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
extreme-heat
Extreme Heat Risk in Cape Town, South Africa
Score: 5/10
extreme-heat
Extreme Heat Risk in Nairobi, Kenya
Score: 1/10
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Extreme Heat Risk in Lagos, Nigeria
Score: 3/10

How this data is built

Johannesburg, South Africa extreme heat risk combines Historical Event Intelligence with authoritative hazard modeling from the Geospatial Intelligence Layers catalog. Live extreme heat 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 extreme heat event data for Johannesburg, South Africa — free dataset samples →Real-time extreme heat alerts by API →

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