Already the 3rd peak of Summer 2021 is forecasted around Thursday, 8. July 2021 for Central Mediterranean and Balkan - mainly western parts, and extreme heatwave will shift far to the north, up to Finland!
Temperatures around +45/+46°C are again possible in Italy (while in Spain and Portugal should fall national records from the net heatwave already at the weekend, around 11. July 2021: https://mkweather.com/spain-and-portugal-at-the-weekend-49c-gfs-all-time-records-are-473c-and-474c/), which is only 2-3°C from the all-time national record.
Extreme temperatures +40/+42°C should appear in parts of Balkan, mainly in Bosnia nad Herzegovina, Serbia, Albania, North Macedonia, but too in Greece or Hungary.
Extremely hot air will be moving northeastward, above Slovakia, Poland, the Baltic region, and Finland, where temperature records are possible, too.
Temperatures in some parts of southern, southeastern, central, eastern, and northern Europe should be again at levels of daily, regionally monthly, or locally even all-time temperature records.
While in Spain for +49°C, +32/+33°C in 850 hPa will be needed, above Italy will shift hot air masses up to +29°C at 850 hPa and above Balkan up to +27°C at 850 hPa.
Already at the weekend, record temperatures in Algeria and Tunisia were measured, with regional all-time records /https://mkweather.com/extremely-hot-air-for-europe-is-prepared-algeria-495c-tunisia-485c-and-all-time-records//, which is a good prediction for extreme heatwaves in Europe.
Remnants of the June heatwaves brought in Lapland, northern Scandinavia anomalous +34,0°C at the weekend /https://mkweather.com/norway-340c-behind-the-arctic-circle-16c-below-all-time-national-record-sweden-328c-finland-320c-2021//, but in next days, mainly Finland will be hit by Saharan air masses (only later Norway and Sweden again - since the weekend).
Heatwave will be probably associated with higher mortality linked with heat comfort, therefore if you live in the region, oversee to older people to follow drinking regime and avoid direct impact of the sun.