Sunny Sunday across all of Italy, temperatures up to 29 degrees.

Sunday, September 27, 2026, the first autumn weekend, Italy is experiencing a period of widespread fine weather, with maximum temperatures reaching 28-29 degrees in the South and the northern plains. The situation is due to the strengthening of a subtropical anticyclone over the Mediterranean, ensuring predominantly clear or slightly cloudy skies across the peninsula.

The only exception is possible harmless cloud buildups over mountainous areas, particularly along the Alpine ridges, during the hottest hours. Maximum temperatures are 3-4 degrees above the late September climatological averages, with values that could reach 29°C in Rome and 26°C in Milan.

Despite the daytime heat, nighttime and early morning hours will see a sharp drop in temperatures, with lows of 12-14 degrees in the northern plains, in line with seasonal averages. The start of next week may bring a further slight increase in temperatures.

The late September heatwave originates from the return of a subtropical anticyclone, a high-pressure area that transports warm air from North Africa toward the Mediterranean. These phenomena, increasingly frequent in recent years, are often linked to climate change, which alters normal seasonal weather patterns.

The current situation developed after the rapid passage of a cold front that in previous days had brought instability, especially in the South. Starting from Sunday, September 27, the anticyclonic ridge from southwestern Europe expanded toward Italy, pushing away the cooler and more unstable air and leading to a general improvement in atmospheric conditions.

This pressure configuration typically brings stable weather, weak winds, and temperatures above average, creating a marked contrast between the afternoon heat and cooler nights, especially in inland areas away from the sea. The persistence of such conditions can have consequences for agriculture, water, and energy consumption, effectively extending the summer season.