Heat Warnings in Japan
Heat Warnings for Japan (East Asia) come from Japan Meteorological Agency (JMA), Fire and Disaster Management Agency (FDMA). This page explains what these warnings mean, which authority publishes them, and how to check the current status for Tokyo.
Check live heatwaves status for TokyoBrowse all warnings
At a glance
- countryJapan · Asia
- reference cityTokyo (35.68, 139.69)
- emergencyPrimary emergency number110 / 119
- risk profilestorm, flood, heat, cold, wildfire, earthquake, volcano, tsunami, landslide, coastal, radiation
What counts as a heat warnings
Heat warnings are issued when forecast temperature, humidity and night-time minimums are expected to put strain on the human body, especially for older people, infants and outdoor workers. Many countries use a multi-day heat health warning system that accounts for acclimatisation rather than a single temperature threshold.
Who issues heat warnings in Japan
Warning levels, colours and terminology are set nationally. Always read the warning text of the issuing authority: it names the affected districts, the expected time window and the recommended action.
If a warning is active in Japan
- Shift physical work to the early morning.
- Drink water regularly before you feel thirsty.
- Check on older neighbours, and never leave children or animals in a parked car.
Where the data comes from
Waarning reads public, key-free sources for Japan: Open-Meteo, national meteorological services, national public health institutes, Copernicus. Measurements and official warnings are shown separately, and official warnings always keep the name of the authority that issued them.
Frequently asked questions
Who issues heat warnings in Japan?
Japan Meteorological Agency (JMA), Fire and Disaster Management Agency (FDMA). Waarning does not issue warnings; it aggregates the public feeds of these bodies and links back to the original source.
What is the emergency number in Japan?
The primary emergency number is 110 / 119. Use it for a life-threatening situation; for non-urgent reports use the local police station number.
Does Waarning show live heat warnings for Japan?
Yes. The dashboard loads the current values for Tokyo from Open-Meteo, national meteorological services, national public health institutes, Copernicus. You can open it with one click and the location is already set.
More warnings for Japan
- Severe Weather Warnings
- Flood Warnings
- Cold and Snow Warnings
- Wildfire Warnings
- Air Quality Warnings
- Earthquake Alerts
Heat Warnings in nearby countries
Generated 2026-10-18. Waarning is not an official warning service; in an emergency follow local authorities and emergency services.