WeatherOnline

Three day forecast and maps for each day.
http://www.weatheronline.co.uk/Italy.htm

Italy Weather And Maps

Offers current weather conditions and six-day weather forecasts for all Provinces of Italy.
http://www.italy-weather-and-maps.com/

Weather Underground

Temperature, humidity, pressure, conditions of many cities and regions.
http://www.wunderground.com/global/IY.html

The Weather Reporter

Brief forecasts plus links to weather Webcams.
http://www.italyflash.com/italyflash/shortt/meteo/weathercams.shtml

Yahoo Weather

Providing forecasts city by city.
http://weather.yahoo.com/regional/ITXX.html

NOAA

Current weather conditions from the US National Weather Service.
http://weather.noaa.gov/weather/IT_cc.html