It comes after summer 2016 was the third hottest since 1965 (surpassed only by 2015 and 2003), with an average temperature of 24.2ºC.
May 2017 was far warmer than usual (2.4ºC above the average), and, bar 2015, it was the hottest in 83 years.
May was also drier than the norm, noticeable by lower water levels, according to AEMET, but rainfall is expected to be normal in the coming two months.
It has warned of a high risk of fires across the region.
Anyone who sees a fire should call 621 or 112 immediately.