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In January 2023, Apple released a software update (16.3) that added humidity and temperature sensing to second-generation HomePod and HomePod mini models. This article explains how to utilize the new features.
The second-generation full-size HomePod was the first to feature temperature and humidity sensors, but that capability was added to existing HomePod mini models through the software update. Unfortunately, the sensors are unavailable for the first-generation HomePod.
How to Update
If you want to get readings from the sensors, make sure your iPhone or iPad is running 16.3 or later, and that your HomePod's software is also up to date (16.3). Then, you can proceed with the following steps:
Open the Home app on your iPhone or iPad.
Select the room containing the HomePod or tap the Climate button at the top of the main screen for your home.
You will see the Temperature and Humidity readings displayed at the top of the screen. If there are multiple temperature sensors in the room, the app will show the average of the readings. (It may take a few minutes for the sensors to calibrate after updating the HomePod software.)
Tap on the readout, then tap the sensor button again to view additional options.
You can now change the name of the sensor, alter its associated room, check its status, and add an automation by accessing the menu card that appears.
That's all you need to do. Remember to tap the Climate button in the main Home app screen to view the readout. Additionally, you should explore the automation options, which can be used to activate other devices when temperature or humidity levels change.