Google maps has integrated a new weather forecast feature which lets you see the weather in any city across the world. Simply choose the Weather layer from Maps icon on the top right corner, and all the cities on the visible map area will show the weather.
Google Weather Forecast
Even the cloud cover is clearly visible and there is an option to hide the clouds for a clearer view. All the city weathers appear on the left sidebar and clicking on any city will give you the weather forecast for the next few days, with maximum and minimum temperature, humidity and cloud cover with rain status. You can get an hourly to a 10 day weather forecast for your city easily.
Check out the intro video for Google weather.