Longview Washington 7 Day Weather Forecast The Weather NetworkLong view , Washington, the weather is fair and delightful all year round. Whether you are exploring the vibrant downtown area or exploring the surrounding breathtaking landscapes, you can expect relaxing weather throughout your stay. From balmy summers to crisp autumns, and from mild winters to invigorating springs, Longview, Washington offers a plethora of outdoor activities for nature enthusiasts. So bring your sunblock and umbrella, as Longview, Washington's weather is ready to amaze you with its changeful and endearing conditions.