Since you don't have a Solar sensor, let's try this for settings in WD to get the Metar to report sky conditions (and set the icon) but with WD rain/wind overrides.
WD, Control Panel, FTP and Connections, METAR download TAB:
select a nearby Metar and 'use this station id'
Tick Use this metar for local sky/icon conditions (and have the box next to it show the selected metar)
Tick Use the metar to update WD' main weather condition report
Set 15 minute download interval and Metar switch set to ON.
WD, Control Panel, Summary image/icons, Set Icon from downloaded Airport Metar TAB
Tick: Use Downloaded Metar to update the icon
Tick: Include extra weather conditions from downloaded Metar
Tick: Show the metar image on the web page
Tick: Your stations rain/wind/fog overrides the metar.
Main screen Icon/Forecast icon setup/Text Scroll TAB
UNtick: Use the WD918/WRK918... forecast for updating the main screen icon.
That should set the icon according to your selected metar and the icon and text should follow after that.
Hope this helps...
Best regards,
Ken