Abby was exactly that color when I took that pic. By the end of our trip, she had darkened up quite a bit because of dirt particles in the sandy campsite. (She's not a swimmer so we waited to give her a bath until we got home. Abby hates baths so we don't do them away from home if at all possible. That way she doesn't have negative associations with places we love. Home is home; she gets over it there.)
Right now, her skin is beginning to lose pigment and her fur is beginning to darken with the approach of fall and winter. That's something that yellow labs do. In the early the spring, the opposite occurs.