Try this,Data Lover個FAQ
Q1: There is no weather data downloaded / The location of the weather is not correct / …
Getting weather to your watch requires 4 things to be right:
Condition 1: You need to be actively connected with your phone via Bluetooth (go to Garmin Connect Mobile and synchronize your watch to force an active connection)
Condition 2: Your phone needs to be connected with the internet
Condition 3: You need to acquire a gps position by starting a run activity and waiting for a green gps fix. (you can return to the watch face once you have acquired the fix, you don’t need to start the run activity). Alternatively in the settings of the app you can also set the default longitude/latitude to your home location, enter the lat/long in the format as provided by this website:
https://www.latlong.net/.
Condition 4: Garmin Connect Mobile needs to be running on your mobile phone (as a background process or actively as a foreground process). Make sure that you have no battery saver apps running that kill the Garmin Connect Mobile instance. (All Internet traffic is throttled through the Garmin Connect Mobile App) (This condition is very important! When the weather is not updating on your watch the usual cause is that Garmin Connect Mobile is not running any more)