The Forecast.io API is now The Dark Sky API
The developer portal is now https://darksky.net/dev/.
The attribution requirement of the Terms of Service have changed. Attribution should:
Display “Powered by Dark Sky”
Link to https://darksky.net/poweredby/.
Please make this change at your earliest convenience!
The API endpoint has changed from https://api.forecast.io/ to https://api.darksky.net/.
The previous endpoint will continue to work, but please change your software as soon as possible.