Gameplay Can I Change The Sky In The Editor?

hello.
can i change sky to add clouds when building route?

 

Only while playing in editor AFAIK. First start the PIE session and when it is running, use the the setcloudiness, setwindspeed, setprecipitation and similar commands in the console.

 

How to open a console in an editor?

 

On my UK keyboard its by pressing the key to the left of the main number 1 key.
Top left key in this image.