BBC.co.uk
Details the average climate in Rome throughout the year.
http://www.bbc.co.uk/weather/world/city_guides/city.shtml?tt=TT004000

Frommer's
Information on the best time of year to visit the Italian capital.
http://www.frommers.com/destinations/rome/0064030002.html

Let's Go
Advice on when to go to the Eternal City.
http://www.letsgo.com/ROMA/01-Discover-8

Rome Tourism
Offers a seven day weather forecast for the city.
http://www.rome-tourism.com/weather.php

Weatherbase
Facts and figures about the weather in Rome.
http://www.weatherbase.com/weather/weather_c.php3?s=124261

World Executive
Annual weather averages for the city.
http://www.worldexecutive.com/cityguides/rome/weather.shtml

Wunderground.com
Weather forecasts for Rome.
http://www.wunderground.com/global/stations/16239.html

Yahoo!
Find out what the weather is like in Rome at present.
http://au.weather.yahoo.com/ITXX/ITXX0067/index_c.html