On the ecobee and mobile Smart Phone app, go to the Main Menu > Sensors section. Beside each sensor, the temperature they are reading will be displayed beside them.
In your Web portal, login and select the Sensor box. Here, you’ll see the current temperature they are reading beside the sensor name.
To view the historical sensor information, login to your web portal and select the Home IQ tab. Select System Monitor, then Follow Me. Here, you’ll see what the sensors have been reading in the past. Alternatively, you can select Download Data and get a spreadsheet of all the information the ecobee was recording and doing for every 5 minutes of the day, including all the sensor information.