Willamina, Oregon is a small town located in the Willamette Valley, approximately 20 miles west of Salem. The town experiences a mild, temperate climate with warm summers and cool, wet winters. Summers are typically dry with average temperatures ranging from 70 to 80 degrees Fahrenheit, while winters are cool and wet with temperatures averaging in the 40s.

The hydrology constituents in Willamina are influenced by the surrounding mountain ranges and rivers. The town is located near the Willamette River and Yamhill River, providing opportunities for boating, fishing, and swimming. The region also boasts numerous creeks and streams, which contribute to the area's water resources.

Outdoor enthusiasts have a variety of recreational opportunities in Willamina. The town is surrounded by forests, including the nearby Willamette National Forest, which offers opportunities for hiking, camping, and wildlife viewing. The local area also features several parks and trails, such as the Willamina Creek Trail and the Willamina Creek Park, providing opportunities for walking, picnicking, and enjoying nature. Overall, Willamina's climate, hydrology constituents, and outdoor recreation opportunities make it an ideal destination for those who appreciate the beauty of the Pacific Northwest.