Copernicus, the EU's climate service, says there is an up to 70 per cent chance that this summer will be one of the hottest 20 per cent on record for Spain.
Temperatures in Spain could rise to 40C in some areas, as a powerful heatwave continues to grip the country.
Spain is bracing itself for another blistering summer, after two consecutive record hot years.
Copernicus, the EU’s climate service, says there is an up to 70 per cent chance that this summer will be one of the hottest 20 per cent on record for the country.
With temperatures already in the mid-thirties in many places, forecasters are warning of worse to come from Wednesday.
Spain's State Meteorological Agency has issued extreme heat warnings for six cities, as the mercury continues to rise mercilessly.
The specific areas that will be on high-temperature alert are Cadiz, Cordoba, Huelva, Jaen, Seville and Badajoz.
Temperatures are forecast to hit 39C in Cordoba and Seville, while Badajoz in the southwest of the country will swelter at 38C.
The three cities of Granada, Jaén and Murcia will bask in temperatures of 37C, with no respite from the heatwave as yet in sight.
The valleys of the Guadiana, Guadalquivir and Segura rivers could also see temperatures rise above 38C.
Spaniards have been told to keep checking the weather warnings and to ensure they stay well hydrated.
Last year was the hottest globally since records began, as the world breached the 1.5C global heating limit set by the Paris Agreement for a whole year for the first time.
Europe’s hottest year yet remains 2022 which, spurred by a significant number of heatwaves, claimed around 11,300 lives in Spain.
To save lives this year, Spain’s Ministry of Health has released a new map to provide more accurate heat alerts.
The map breaks the country down from 52 provincial areas into 182 "meteohealth zones".
It shows the temperature thresholds that trigger heat deaths, which vary considerably between - and within - provinces, hence the need for a more detailed map.
To determine the meteohealth areas, data from hundreds of observatories was compared with the figures for heat-related deaths from 2009 to 2018, researcher Julio Díaz told El Pais newspaper.