Want the weather on your site? Use Google’s weather API.
Here’s an example:
http://www.google.com/ig/api?weather=Phuket+Thailand
And here’s the list of possible weather images that are used by the API:
just in case you want to replace with your own nicer ones like, for example, these from iStockphoto:
And for those of you who use CakePHP, here’s a CakePHP Weather Component which uses the Google Weather API.