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Heat 4/5 high METEOALARM

Heat warning level 4 hits Lyss-Grenchen area

Unchanged since the first report last verified 17:28 CEST

Summary

A level 4 out of 5 heat warning is in effect for the Lyss-Grenchen area. Persistently high temperatures are putting a strain on public health.

What hazard threatens

Persistently high day and night temperatures place heavy strain on circulation and health, particularly for the elderly, infants and the sick. The risk of forest and wildfires is also rising due to the dryness.

Local weather conditions

Measuring station Grenchen, 428 m a.s.l., 11 km from the event

Temperature

29.9 °C

When the warning was issued · 29.07.2026 12:00 CEST

Daily maximum

35.3 °C

on the day of the warning

Humidity

44 %

When the warning was issued · 29.07.2026 12:00 CEST

Day of warning and following days

  • Wed 29.07. 35° 14° 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 potential impact as high. Preparing early can significantly reduce health risks; the linked guide outlines concrete steps to take.

What to do now

Drink enough fluids and avoid physical exertion and time outdoors during the midday heat. Ventilate rooms at night and in the morning, then shade them during the day. Check on vulnerable people around you and observe any outdoor fire bans in place.

Risk matrix

Event location

Coordinates · WGS84
47.0979° N, 7.3258° E
47°05′52.4″ N   7°19′33.0″ E