1- To Setup your weather code, You have to visit the website  weathers.codes
2- Next, type in your city name in the search bar and copy the weather code corresponding to your City as Shown on the preview below.

neon space rainmeter weather

3- Now we have to paste our weather code into Neon Space Menu skin as shown below.

neon space tutorial skin

4- All the weather skins should update now automatically after we hit the enter key.