SliverSport10

Hi All, I was wondering if anybody else was experiencing this problem. It seems that my front tires are cronically low on pressure. I noticed about a week ago that my tires looked low, and when I checked them, they were @ about 22 psi. So I filled them up to the recommended 35 psi but a day or so later they look like they are low again. Is this just a result of the cold weather or should I have this checked out? Thx!