Use your location in Weather on Mac
Weather uses your current location to show you the weather forecast and conditions in your area.
Allow Weather to use your current location
The first time you open the Weather app on your Mac, you’re asked to allow Weather to use your current location. You can also grant Weather access to your location in Privacy & Security settings.
On your Mac, choose Apple menu
in the sidebar. (You may need to scroll down.)On the right, click Location Services, turn on Location Services (if it’s not already on), then turn on Weather.
View your current location’s forecast
The details for your current location appear when you open the Weather app on your Mac. If you don’t see them, click 
in the toolbar, then click My Location.
Stop Weather from using your current location
You can turn off Location Services for just Weather or for all apps on your Mac.
On your Mac, choose Apple menu
On the right, click Location Services, then turn off Weather.
To stop using Location Services for all apps, turn off Location Services.
Note: If you turn Location Services off for an app, you’re asked to turn it on again the next time that app tries to use your location data.