I believe you would need to create a shortcut to get that information all at one time. I couldn’t get Siri to provide both when asking verbally.
You can create the shortcut and then run it on your watch.
iPhone > Shortcuts app> Create Personal Automation > Get Weather > Get Text > Input whatever text you want using the weather variables like below > speak text > make sure ask before running is toggled off.
The picture below shows the automation that automatically runs every morning for me at 5am.