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The small agricultural community of Mattawa, Washington is in Grant County. The community of Mattawa is home to the first Straw Bale library in the United States. Weather in Mattawa is seasonal; summers can reach up to the 90's which is a fun time to head over to the local Priest Rapids Lake or down to the Columbia River. Mattawa’s winters can get a little chilly, down to the teens or 20's, a wonderful time to snuggle in close to the fire with an enjoyable book and a hot drink. Mattawa is a short drive from the base of the Cascade Mountains, great for those interested in mountain biking, hiking, camping, snow sports, or other mountain activities.