The City of Pinole is located in the San Francisco Bay Area, on the shores of San Pablo Bay in West Contra Costa County. Interstate-80, which traverses the City, connects the San Francisco/Oakland metropolitan area with Sacramento and points East. Pinole is linked to central Contra Costa County including the cities of Martinez, Concord, and Pleasant Hill by State Route 4, which begins just north of the City and connects with Interstate-680. The City of Pinole has a land area of more than four square miles; much of the land has gently rolling hills with steeper hills paralleling on the north and south. Elevation in the City ranges from sea level to 500 feet above sea level. The climate is mild, with no extremes of temperature, rainfall or humidity. Lowest and highest temperatures are in the narrow range of an average low of 40°F in the winter to an average 85°F in the summer.