How to get ambient air temperature into graph

Is there a way to display ambient air temperature with the SolarEdge device temperature in the graph? Is there a weather site that provides and API key without having to install a monitoring station?

Alternatively, I’ve got a number of temperature devices that I can access in my HA system and I can push those temperatures with an http request to anywhere. Is there an API for pvoutput that would allow me to periodically push temperature data from my own sensors? And if so, how do I display that data in the graph?

See https://openweathermap.org/

Create an account with www.wunderground.com and set up your home device on there. It will allow you to create an API key for your new station. That’s what I did.