What weather station are you using?
I'll take a guess at Ecowitt?
As for Wunderground, you can't have mixed units on their site unfortunately. If you set it to mph, you'll get Fahrenheit for temperatures. If you want Celsius for temperatures, you're stuck with Km/h for wind speeds.
Wunderground is a sore point with weather station owners. Many have stopped sending them data due to so many issues and things being removed with zero support or communication.