Longview WA 10Day Weather Forecast The Weather ChannelLong-view , Washington State, the weather is fair and delightful all year round. Whether you are exploring the vibrant downtown area or discovering the surrounding breathtaking landscapes, you can expect relaxing weather throughout your stay. From hot summers to brisk autumns, and from moderate winters to invigorating springs, Longview, Washington offers a plethora of outdoor activities for outdoor lovers. So bring your sunblock and umbrella, because Longview, Washington's weather is ready to amaze you with its changeful and endearing conditions.