Thanks.

But, I just went through their source code.
seems like THIS is one of the feeds they use and its free and available to public as per the weather.com website ( so this is an exception since its explicitly provided by the data source )

" Weather XML Data Feed
Now you can include weather data from The Weather Channel® in your website, desktop application, or widget in return for proper attribution and five (5) required links back to www.weather.com. Sign up now – It's FREE"

I agree websites that provide developers with api's or feed are legal but not many do as I stated in my initial post, I was referring to data from those websites that dont provide such a feed. What about them ?

cheers