Adding a weather station to SmartThings is not only free but will also help your smart home adapt and respond to the outside conditions. Maybe you want to get alerts when the temperature and humidity are lower than inside so you can open up your windows to save on energy.

Maybe you want your outdoor lights to turn on when it gets dark. By adding the Smart Weather Station to SmartThings you will get the temperature, humidity, and illuminance which will allow you to automate on a deeper level.