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Heat 4/5 high METEOALARM

Level 4 heat warning issued for Nyon - Terre Sainte

Unchanged since the first report last verified 18:13 CEST

Summary

A level 4 out of 5 heat warning is in effect for Nyon - Terre Sainte. Persistently high temperatures are placing significant strain on health and circulation.

What hazard threatens

The sustained heat places heavy strain on circulation and health, particularly for the elderly, infants and the sick. The risk of forest and wildfires also rises.

Local weather conditions

Measuring station Nyon / Changins, 458 m a.s.l., 2 km from the event

Temperature

30.6 °C

When the warning was issued · 29.07.2026 12:00 CEST

Daily maximum

35.2 °C

on the day of the warning

Humidity

41 %

When the warning was issued · 29.07.2026 12:00 CEST

Day of warning and following days

  • Wed 29.07. 35° 19° 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 assessed as medium and the impact as high. Prepare early for the effects of the heat using the relevant guide.

What to do now

Drink enough fluids, avoid the midday heat and physical exertion outdoors. Ventilate living spaces at night and in the morning, shade them during the day, look after vulnerable people around you, and observe any outdoor fire bans in effect.

Risk matrix

Event location

Coordinates · WGS84
46.4031° N, 6.2533° E
46°24′11.3″ N   6°15′11.7″ E