BBC Weather Centre + Country Guides: Belgium - Provides climate and weather information, facts and statistics about the country, along with five+day forecasts for major cities.
NOAA NWS + Belgium Weather - US government site provides hour+by+hour weather conditions for the past 24 hours for major cities and locations in the country.
Weather Underground + Belgium - Displays current conditions for all major cities on one page, with five+day forecast and more detailed information for each available.