Longview Climate Weather By Month Average Temperature Long view , Washington, the weather is fair and enjoyable all year round. Whether you are touring the vibrant downtown area or adventuring the surrounding picturesque landscapes, you can expect content weather throughout your stay. From hot summers to crisp autumns, and from gentle winters to invigorating springs, Longview, Washington offers a variety of open-air activities for outdoor lovers. So bring your sunblock and umbrella, because Longview, Washington's weather is ready to impress you with its variable and charming conditions.