Naples and Campania weather today, September 17, 2026: Increasing clouds and possible isolated showers.

The weather in Campania remains variable. Updated forecasts this morning for Naples indicate a low of around 23°C and a high of around 28°C, with skies characterized by scattered clouds and clearings. According to 3B Meteo, no significant rainfall is expected in the next few hours, while winds will strengthen from the southwest throughout the day. The sea is expected to be calm.

A more cautious forecast comes from the bulletin from the University of Naples Parthenope, which reports alternating cloud cover and clear spells for the capital, with brief rain showers not ruled out. Temperatures are expected to range between 22-23°C (72-73°F) and 26-27°C (79-81°F).

Clouds especially in the afternoon

The regional weather pattern varies slightly depending on the area. Meteo.it reports a generally clear or partly cloudy morning for Campania, with increasing cloud cover in the afternoon, especially along the Apennines. Regional maximum temperatures will generally range between 27 and 30°C.

The ARPAC weather forecast, however, calls for cloudy skies and isolated showers today, with light and variable winds. For the Naples-Caserta area, the forecast is for a minimum of 22°C and a maximum of 28°C, with predominantly southerly winds.

Temperatures in the main cities

Here are the indicative values ​​for today:

Naples: 20-28°C according to Meteo.it; other estimates indicate 23-28°C.
Caserta: around 19-29°C.
Benevento: around 18-29°C, with variable cloud cover.
Avellino: around 18-27°C, with scattered clouds.
Salerno: around 19-25/27°C, with generally more variable conditions along the coast.
Winds and seas

Winds will generally remain light in the early hours, then shift predominantly from the southwest and become moderate in the middle of the day. Parthenope University reports the possibility of gusts of up to 40-50 km/h in inland and border areas.

Slightly rough or almost calm sea conditions prevail, although local winds may strengthen along some coastal stretches.

A worsening is coming on Friday

The real change in weather is expected on Friday, September 18th. Forecasts indicate increased instability, with patchy cloudy skies, the possibility of scattered showers and thunderstorms, and a further drop in temperatures. In Naples, highs are expected to be around 26°C.

The Arpac bulletin also highlights the transition towards a low pressure system for Friday, with very cloudy skies and isolated precipitation.

Still a pleasant day, but with an umbrella at hand

In short, Thursday, September 17th will be a transitional day: no real general worsening is expected, but the presence of clouds and the possibility of isolated precipitation advise greater caution, especially in the afternoon hours and in inland and mountainous areas.

In Naples and along the coast, the weather will remain generally mild, with temperatures far from the summer heat peaks. The most significant deterioration is expected in the next 24 hours, when instability is expected to increase in Campania.