Longview Texas 7 Day Weather Forecast The Weather NetworkLongview , Washington State, the weather is moderate and delightful all year round. Whether you are exploring the vibrant downtown area or exploring the surrounding scenic landscapes, you can expect relaxing climate throughout your stay. From balmy summers to crisp autumns, and from moderate winters to invigorating springs, Longview, Washington offers a variety of open-air activities for outdoor lovers. So bring your sunscreen and parasol, as Longview, Washington's weather is ready to amaze you with its variable and endearing conditions.