Runtime execution error: xxx to type 'Integer' is not valid

You can check this solution:
ChangeStringToInt.xaml (5.4 KB)

Assign 1:

kelvin_temperature = "89°F"

Assign 2:

kelvin_temperature_without_faraday = Convert.ToString(kelvin_temperature.Replace("°F",""))

Assign 3:

temperature_in_int = CInt(kelvin_temperature_without_faraday)

Results: