The Isle (Evrima) sets weather and time-of-day in Game.ini — not over RCON.
1. Connect SFTP first (see "Connecting your server with SFTP").
2. Open your server → Config tab. PanelForge loads your live Game.ini.
3. Edit the values you want (day/night length, weather, gameplay settings), then click Save.
4. Restart your server for the changes to take effect — SFTP can't restart it for you.
Keep a copy of a known-good config before making big changes.