On the LG smartphone, we can view the weather in the calendar, and the current location is always used for the forecast. It is not possible to set a fixed location.

Android 9 | LG UX 9.0
Step 1:  Open the  Calendar -App
Step 2:  Open the  Menu
Step 3:  Open the  Settings
Step 4:  Tap on  Calendar
Step 5:  Enable or Disable  Show weather
  1. Open the Calendar-App
  2. Open the Menu
  3. Open the Settings
  4. Tap on Calendar
  5. Enable or Disable Show weather

LG Instructions