Prag-Pension.cz
A month-by-month guide to average temperatures, humidity and rainfall in Prague.
http://www.prag-pension.cz/weather.html

Weather Forecast.ws
Find out what the weather is like in Prague at present and over the next few days.
http://ne.weather-forecast.ws/prague

WeatherOnline.com
Get a six-day weather forecast for the Czech capital.
http://www.weatheronline.co.uk/CzechRepublic/Prague.htm

World Executive
Includes a chart depicting the average temperature and hours of sunshine in Prague throughout the year. The page also contains an up-to-date five day weather forecast for the city.
http://www.worldexecutive.com/cityguides/prague/weather.shtml

Wunderground.com
The latest weather in Prague.
http://www.wunderground.com/global/stations/11518.html