This is the 4730th most frequent German word.
westlich
West of; western.
Here, 'westlich' denotes the relative direction (to the west) of the sunset in relation to the mountain.
Der Sonnenuntergang war wunderschön westlich des Berges.
The sunset was beautiful west of the mountain.
In this sentence, 'westlich' describes the origin of the breeze, specifically identifying it as coming from the west.
Die westliche Brise brachte kühlende Luft an den Strand.
The western breeze brought cooling air to the beach.
Here, 'westlich' is used attributively to define the location of a district within the city, indicating it is situated in the west.