Spiders are everywhere. It has been estimated that you are never more than 10 feet away from a spider at any given time. As the weather changes throughout the year, when it starts to get colder or when water supplies begin to dry up, you tend to find them indoors more frequently.
Spiders can typically be found in:
Windows.
Ceiling corners.
Pantries or closets, both indoors and outdoors.
Basements and attics.
Under porches or in crawl spaces.
Anywhere dark and less frequented.