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Heat 4/5 high METEOALARM

Heat warning level 4: Vallée de Joux

Unchanged since the first report

Summary

A level 4 out of 5 heat warning is in effect for the Vallée de Joux. Persistently high temperatures are placing a heavy burden on health and circulation.

What hazard threatens

Persistently high day and night temperatures favour dehydration, heat stroke and circulatory problems; the elderly, infants, the chronically ill and pregnant women are particularly at risk. The risk of forest and wildfires is also rising.

Local weather conditions

Measuring station Les Charbonnières, 1045 m a.s.l., 3 km from the event

Temperature

28.3 °C

When the warning was issued · 29.07.2026 12:00 CEST

Daily maximum

30.6 °C

on the day of the warning

Humidity

31 %

When the warning was issued · 29.07.2026 12:00 CEST

Day of warning and following days

  • Wed 29.07. 31° 12° measured

As of: Values as at the time of the warning; they are not updated afterwards.

Source: MeteoSwiss

Context & protective measures

Background: heat waves are becoming more frequent and intense in Switzerland. The greatest danger is the health burden from persistently high day and night temperatures, which favour dehydration, heat stroke and circulatory problems. The elderly, the chronically ill, pregnant women and infants are particularly at risk.

Recommendation

The likelihood is medium and the potential impact high. Drink enough fluids, avoid physical exertion and outdoor exposure during the hottest hours, and keep living spaces cool by ventilating during cooler hours and shading during the day.

What to do now

Check your water supplies and cooling options now, look out for vulnerable people in your neighbourhood, and observe any outdoor fire bans currently in force.

Risk matrix

Event location

Coordinates · WGS84
46.6408° N, 6.3076° E
46°38′26.9″ N   6°18′27.5″ E