Deadly heatwave for Europe already around 5. June: Italy +42°C, Hungary +37°C
Marek Kučera 
May 2025 will end in many parts of Europe as cold or very cold with temperature anomalies in Belarus, Lithuania, most of Poland, Latvia, Ukraine and parts of Slovakia, Hungary, Czechia, Estonia, Romania, Moldova and European Russia with temperature anomaly below -3°C, so far, until 20. May 2025. E.g. in Lithuania, -5,8°C, in Belarus, -5,2°C, in the UK, -4,7°C, or in Hungary, -4,4°C was in May 2025 measured.
On 20. May 2025, the next cold mornings appeared, e.g. in Ocna Sugatag, Romania (-0,5°C), Aboyne, the UK (-0,2°C) or Usak Meydan, Turkey (-0,2°C). On 22. May 2025, -1,8°C was measured in Altnaharra, the UK, an the following 2 mornings – Friday and Saturday, 23.-24. May, temperatures up to -5°C should appear rarely in continental Europe and the British Islands.
Significant warming effect is however prepared for the start of Summer 2025 in Europe, with temperatures gradually above +40°C in parts of Spain and Portugal, +38°C in France, +28°C in the UK and later, up to record-breaking +42°C in central Italy , or +37°C in Hungary (according to the newest GFS outputs /for regional records, +3°C is needed to add/). Many parts of continental Europe from France to Ukraine on the West and East and from Denmark to Hungary on the North and South, should see tropical temperatures +30/+35°C already around 5. June 2025, which should bring many historic and temperature records!
Moreover, heatwaves should persist in Europe minimally until mid-July, with shorter breaks with T-storms, generating flash floods, large hail, gusty winds, damaging lightening or even tornadoes.
According to the newest information, heatwaves will be the strongest around 5. and around 25. June (+/-5 days).
In the last hours appeared severe storms with 6 cm hail and flash floods in France and at the end of the article, we are joining the next information about extreme May Iceland heatwave, with maximum temperatures up to +26,6°C.
Summer 2025 forecast for Europe you will find here: https://mkweather.com/summer-2025-forecast-for-europe/ – according to current forecasts of CFS is still forecast stormier West and South and Drier East and North in Summer 2025, with some exceptions of the British Islands, Benelux or Norway in some months.
Don´t forget that during extreme and record-breaking heatwaves, elders should suffer by dehydration, because they don´t feel thirst, therefore pay attention to the drinking regime of your parents and grandparents.
Expected is an increased ratio of heart attacks, too, with some problems from heat for people suffering diabetes, Alzheimer or Parkinson diseases /https://mkweather.com/weather-effect-on-diseases-in-climate-zones//, which are diseases sensitive to heatwaves.
Temperature anomaly in Europe on 1.-19. May 2025 according to ESRL composites. Source: https://psl.noaa.gov/data/composites/day/
FROSTS IN LATE SEASON IN EUROPE IN THE FOLLOWING DAYS
Frosts and ground frosts in Europe at the end of May 2025. Source: https://www.wetterzentrale.de/en/topkarten.php?map=3&model=gfs&var=17&run=12&time=66&lid=OP&h=0&mv=0&tr=6#mapref
EXTREME HEATWAVES UP TO +37°C IN CONTINENTAL EUROPE (HUNGARY) AND +42°C IN THE MEDITERRANEAN (ITALY) ARE POSSIBLE AROUND 5. JUNE 2025!
THE HOTTEST SHOULD BE THE START AND THE END OF JUNE 2025
Temperature anomalies in Europe in the hottest weeks in the next 6 week-periods. Source: https://charts.ecmwf.int/products/extended-anomaly-2t?base_time=202505210000&projection=opencharts_europe&valid_time=202506300000
6 cm hail in Villelongue-d’Aude, France. Source: https://www.facebook.com/photo.php?fbid=10222620666704497&set=p.10222620666704497&type=3
Damaging lightening in Chazelles (Le Luquet), France. Source: https://www.charentelibre.fr/charente/val-de-tardoire/la-foudre-frappe-un-cedre-a-chazelles-reduit-en-allumettes-24517718.php
LARGE HAIL IN BOSNIA AND HERZEGOVINA
5 cm hail in Kozarska Dubica, Bosnia and Herzegovina. Source: https://www.facebook.com/reel/647928201582034
The highest precipitation amounts in the last 3 days. Source: https://ogimet.com/ranking.phtml
AFTER HEATWAVE IN ICELAND
Updated CFS forecast for the next months – precipitation anomalies. Source: https://www.cpc.ncep.noaa.gov/products/CFSv2/htmls/euPrece3Mon.html
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