Give it some time. I have had this happen a few times in the past. Fixed with up-pair and pair again but this cleared some of my activity data. I have turned location services off and on with little success. (suggested) I have opened the weather app on my phone and set a default location with limited success. Yesterday when I didn't have the temperature I restarted everything, turned location services off and on and made sure weather would show on my phone. Nothing helped so I ignored it. A few hours later it was back and has been fine. I have only lost the temperature view a few times but I don't know why nor do I have a solid fix other than to pair again.