NOAA NWS - Brazil Weather US government site provides hour-by-hour weather conditions for the past 24 hours for major cities and locations in the country. http://weather.noaa.gov/weather/BR_cc.html
Weather Underground - Brazil Displays current conditions for all major cities on one page, with five-day forecast and more detailed information for each available. http://www.wunderground.com/global/BZ.html
World Weather Information Service - Brazil UN weather agency's month-by-month temperature and precipitation information by city. http://www.worldweather.org/136/m136.htm