DisasterAWARE
9
Extreme

flood Flood Risk in Tokyo, Japan

Risk Level: Extreme — Score 9/10

Risk: 9Historical: 10

Key Risk Factors

  • High risk rating for Tokyo based on ThinkHazard (River flood)
  • 19 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: Flood - N of Tone River, Tone Basin, Tochigi, Japan (2026-05-19) — 8,260,000 people exposed

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
Tokyo is not in the top 10 for flood risk among tracked cities.

How Tokyo Compares

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Notable Flood Events Near Tokyo

Floods - Japan

October 14, 2019 — WARNING

Impact data not available

Floods - Japan

October 28, 2019 — WARNING

Impact data not available

Floods - Chiba, Japan

November 28, 2022 — WARNING

Impact data not available

Floods - Japan

September 9, 2015 — WARNING

Impact data not available

Flood - N of Tone River, Tone Basin, Tochigi, Japan

May 18, 2026 — WATCH

8,260,000 people exposed; $2,574,707M capital exposed

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

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Earthquake Risk in Tokyo
Score: 9/10
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Wildfire Risk in Tokyo
Score: 9/10
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Hurricane Risk in Tokyo
Score: 0/10
tornado
Tornado Risk in Tokyo
Score: 0/10
winter-storm
Winter Storm Risk in Tokyo
Score: 0/10
landslide
Landslide Risk in Tokyo
Score: 9/10
extreme-heat
Extreme Heat Risk in Tokyo
Score: 5/10
drought
Drought Risk in Tokyo
Score: 3/10
high-wind
High Wind Risk in Tokyo
Score: 0/10
tsunami
Tsunami Risk in Tokyo
Score: 9/10
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Flood Risk in Osaka, Japan
Score: 9/10
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Flood Risk in Seoul, South Korea
Score: 5/10
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Flood Risk in Shanghai, China
Score: 9/10

How this data is built

Tokyo, Japan 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.

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