Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
Now you can send data to Windy using WeeWX. The WeeWX weather system is an open-source platform written in Python. WeeWX is ideal to run on Raspberry Pi.
To send data from your WeeWX you just need to install WeeWX's plugin.