Are you using SU7 version (1.21.13.0), or the latest SU7 test version (1.21.18.0)? If you’re still in the .13 version, that’s a known issue, and it appears to be fixed in the .18 version. If you don’t want to worry about going into the test version, you can wait until the official release version is put out and the custom weather settings should work correctly then.
If you’re in the test version, then please report it in the appropriate thread.
Regards