If you are curious to know if it’s raining in any particular city of the world, then you have an online application for it. Just type type IsItRaining.in/
This shows you the current conditions of Chennai. The answer will be binary form, YES or NO. This tool also tells you the current weather conditions of the particular city or state.
You can refine search results by adding the name of a State / Country after the name of the city, e.g.: http://isitraining.in/Cadiz-Spain or http://isitraining.in/Las-Vegas-New-Mexico.
The current weather forecast is from Yahoo Weather using Yahoo! Query Language with PHP; the results are then cached for half hour after the first request.