Roseburg is situated at the heart of the Hundred Valleys of the Umpqua in scenic, Southwestern Oregon. On Interstate 5, it is 67 miles south of the state's second largest city, Eugene, and 123 miles north of the California border. Traveling by State Highway 38/138 or 42, Roseburg is about 80 miles inland from the Pacific coastal communities Reedsport and Coos Bay. Highway 138 continues east from the city along the North Umpqua river. It is 79 miles to Diamond Lake at the summit of the Oregon Cascades and just 20 miles more to Crater Lake National Park.
One of the nicest things about Roseburg is its seasons. Winters are cool without much freezing and provide most of the rainfall that brings blossom-filled springs. A warming trend begins in April and May, continuing into the summery days of July and August. Fall weather is pleasant and crisp, producing brilliant leaf colors in late October.
The Hundred Valleys of the Umpqua have been compared geographically and climatologically with Italy and Southern France. Extremes of heat and cold are rare. The summer humidity is low and snowfall is rare on the valley floor. The normal growing season is 217 days. Roseburg enjoys one of the lowest average wind velocities in the United States.