Is there anyway that you can ask Alexa to tell the temperature from a multi sensor?
Yes, but you have to use a custom app: [RELEASE] Ask Alexa
It’s worth setting up, but a decent amount of work.
Here is the latest version : [Depricated] Ask Alexa 2.2.0
You can use EchoSistant as well. Both apps work great, they just give a different experience.