Leaving for Rome this Wed 11-16. Will be in Rome, Venice, Florence over next 10 days. How's the weather forecast?
I use www.weather.com for their 5- and 10-day forecasts, and they seem as accurate as any.
If you search '[city name] weather' on the Net, it takes you straight to the 10 day forecast on weather.com.
www.wunderground.com is also good for Italy