Italy faces sixth heatwave with three cities on orange alert before midweek weather shift

Ministry of Health alert designations

The Italian Ministry of Health published its daily heatwave bulletin on Sunday, 6 September 2026, categorizing conditions across 27 monitored provincial capitals and metropolitan areas. Level 2 orange alerts were designated for Bari, Campobasso, and Perugia, indicating high temperatures and meteorological conditions capable of causing adverse health outcomes, particularly among elderly people and young children. Fifteen urban centres were placed under level 1 yellow alerts: Ancona, Bologna, Brescia, Catania, Civitavecchia, Florence, Frosinone, Latina, Messina, Naples, Palermo, Pescara, Reggio Calabria, Rieti, and Rome. Nine cities remained under level 0 green status, comprising Bolzano, Cagliari, Genoa, Milan, Turin, Trieste, Venice, Verona, and Viterbo. While Sunday brought slight daytime temperature decreases along the Adriatic coast and across northern regions, readings across the monitored network remained above seasonal reference values.

Sixth heatwave of the 2026 summer season

The elevated temperatures on the first weekend of September represent the sixth distinct heatwave to impact the Italian peninsula during the 2026 summer season. The persistent weather pattern is maintained by an African anticyclone over the Mediterranean basin, which continues to transport hot air masses northward from North Africa. Summer 2026 was officially recorded as the warmest summer in history for France, Switzerland, and extensive portions of northern Italy, including all of Piedmont, Milan, Genoa, and Padua. Although nighttime minimum temperatures have decreased slightly compared to previous weeks, daytime highs across both northern and southern Italy are forecast to reach peak values of up to 37 degrees Celsius through Monday, 7 September, and Tuesday, 8 September.

Mountain instability and early storm formation

Sunday and Monday weather conditions across Italy feature predominantly clear skies and sunshine from northern to southern regions, accompanied by afternoon cloud build-up over mountainous terrain. On Monday, 7 September, daytime heating will trigger isolated showers and thunderstorms along the Alpine arc and sporadic convective activity across the central-northern Apennines. These localized storms are expected to persist into Monday evening over the Dolomites and the mountain ranges of Veneto and Friuli. Maximum temperatures on Monday are projected to rise slightly in central and northern Italy while experiencing a minor decrease in the southern regions. By the evening of Tuesday, 8 September, initial heavy rain showers are forecast to move from the Alps down into the lower plains of Piedmont and Lombardy.

Influx of polar trough and midweek temperature drop

Numerical weather prediction models show an Arctic trough descending over central Europe on Tuesday, 8 September, before extending into the central-northern Mediterranean basin. This circulation will steer Atlantic air masses into Italy on Wednesday, 9 September, generating rainfall and localized severe thunderstorms across northern territories and parts of central Italy. Italian meteorologist Mario Giuliacci described the impending meteorological transition during a video briefing released on the afternoon of Saturday, 5 September.

Fresh air, there is a turning point for the thermal collapse: temperatures down by up to 10 degrees. Storms and extreme events are coming.

While hot, stable conditions will persist in the south and Sicily through Wednesday, the weather front is projected to reach southern Italy on Thursday, 10 September. Between 9 and 10 September, peninsula-wide temperatures are forecast to drop close to seasonal norms, ending the heatwave.