Meet Eve Weather: a wireless outdoor sensor with HomeKit support that senses temperature, humidity, and air pressure. It responds to your voice commands on your smartphone. Eve Weather is IPX3 water resistant. It lets you keep track of the weather and access the data on your iPhone and iPad.
Eve Weather connects to your iPhone or iPad using Bluetooth. It does not require a hub to work. You can use Siri to ask for temperature or humidity data. You can get this smart device for under $50.