Hey there Plavka,
Thanks for reaching out to the Apple Support Communities. To get started, is it possible that the location that you're seeing is set as the default city in the Weather app on your Apple Watch?
If unsure, take a look at the steps listed in the following resource that can help checking that, and changing the default city if needed: Check the weather on Apple Watch - Apple Support
Choose your default city
1. Open the Settings app
on your Apple Watch.
2. Tap Weather, tap Default City, then choose a city.
You can also open the Apple Watch app on your iPhone, tap My Watch, then go to Weather > Default City.
If the default city is showing correct, and you're still seeing the wrong location, check if you have Location Services enabled on your Apple Watch by going into Settings on the Apple Watch > Privacy & Security > Location Services.
If Location Services is disabled, turn this setting on, restart your Apple Watch, and test the issue again.
Keep us updated on the results.
Take care!