Czech Hydrometeorological Institute - Information about atmospheric conditions with links to research projects and environmental agencies. Headings in English but detail of content is only in Czech.
NOAA NWS - Czech Republic 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 - Czech Republic - Displays current conditions for all major cities on one page, with five-day forecast and more detailed information for each available.