Try this:
say("The temperature is ", String::format("Temp %.1f °C", Temp_ude.state) + "Grader","voicerss:daDK","sonos:PLAY1:RINCON_949F3E72CEE801400")
Try this:
say("The temperature is ", String::format("Temp %.1f °C", Temp_ude.state) + "Grader","voicerss:daDK","sonos:PLAY1:RINCON_949F3E72CEE801400")