An unprecedented high-pressure system continues to dominate Italy, delivering scorching sunshine and temperatures far above seasonal norms, with forecasts predicting hot days of 31°C and unusually warm nights up to 13°C in northern plains through late September and early October.

Atmospheric Overview

A persistent high-pressure anticyclone, locally called "rimonta", blankets the entire peninsula, suppressing cool fronts and maintaining a Mediterranean‑like climate well into autumn. Monday, September 28, will bring clear skies across the nation, with daytime highs expected between 29°C‑31°C in major cities.

The south‑alpine and Po‑plain regions may see night temperatures drop to 12‑13°C, creating sharp daily temperature swings that contrast sharply with scorching daytime heat.

Climatic Context

The current situation stems from typical summer atmospheric patterns in Italy, where prolonged anticyclonic conditions keep frigid air masses at bay. Meteorologists note this is the longest sustained high‑pressure episode recorded for September in the last decade, extending the warm season into early October.

Forecast Summary (Sept 28‑29)
  • Sunshine Clear / Partly Cloudy
  • Max Temperature 29‑31 °C
  • Min Temperature (N. Plains) 12‑13 °C
  • Wind Light breeze, < 10 km/h
Extended Outlook

If the high persists, stable conditions may continue through the first week of October, keeping temperatures above the seasonal average. Night‑time temperature gradients are expected to increase, especially across the interior North, potentially prompting frost advisories in higher elevations.

Authorities advise vulnerable groups to stay hydrated and limit outdoor activity during peak UV hours (11 a.m.–4 p.m.).