Heat Warnings worldwide
Heatwaves and extreme apparent temperature — covered for 121 countries. 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.
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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.
If a warning is active
- 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.
Sources used for this category
Open-Meteo, national meteorological services, national public health institutes, Copernicus. Waarning reads these public feeds directly in your browser; the official warning always keeps the name of the authority that issued it.
Heat Warnings in Europe
Heat Warnings in Asia
Heat Warnings in Africa
Heat Warnings in North America
Frequently asked questions
What is a heat warning?
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.
Where does Waarning get heat warnings from?
Public sources: Open-Meteo, national meteorological services, national public health institutes, Copernicus. Waarning never re-labels an official warning as its own.
Other warning categories
- Severe Weather Warnings
- Cold and Snow Warnings
- Drought Warnings
- Air Quality Warnings
- Coastal and Marine Warnings
- Space Weather Warnings
Generated 2026-10-12.