More than 200 deaths have been linked to Spain’s four-day heatwave this week.

The figures come from the MoMo (Daily Mortality Monitoring System), which compares the number of deaths recorded each day with the number normally expected based on historical trends.

It also factors in temperature data supplied by state weather agency Aemet.

According to the latest estimates, 212 people died from heat-related causes between June 21 and June 24, compared with 98 deaths during the same four-day period in 2025.

However, experts have stressed that the figures are provisional and should not be interpreted as confirmed heat deaths.

The National Centre for Epidemiology (CNE), which operates the MoMo system, says the data normally becomes more reliable after around a week as additional death registrations are processed.

CNE scientist Diana Gomez explained that MoMo does not record individual confirmed heat deaths.

Instead, it uses a statistical model that compares observed mortality with expected mortality while taking daily temperatures into account.

Using that model, June has so far recorded an estimated 380 excess deaths linked to high temperatures, with more than half occurring during the heatwave that has just ended.

The past few days have also broken temperature records. According to Aemet, Monday and Tuesday were the hottest June days ever recorded in mainland Spain since records began in 1950, with average national temperatures of 28.17C and 28.08C respectively.

Although no parts of Spain remained under red or orange heat warnings by Thursday, health officials continue to urge caution following one of the most intense early-summer heatwaves on record.

Last summer, the Health Ministry attributed 3,832 deaths to high temperatures between May 16 and September 30.

Spain is considered one of the European countries most vulnerable to climate change and has experienced increasingly frequent and intense heatwaves in recent years, with fewer breaks between periods of extreme heat.