To find the current temperature, you need to subtract the temperature change from the initial temperature:
Initial temperature: 13°C
Temperature change: -18.6°C
Current temperature = Initial temperature + Temperature change
Current temperature = 13°C + (-18.6°C)
Current temperature = 13°C - 18.6°C
Current temperature = -5.6°C
So, the current temperature is -5.6°C.