Longview climate Temperature Longview Weather By MonthLong-view , Washington, the weather is gentle and agreeable all year round. Whether you are touring the lively downtown area or exploring the surrounding picturesque landscapes, you can expect content weather throughout your stay. From hot summers to cool autumns, and from mild winters to cooling springs, Longview, Washington offers a plethora of open-air activities for adventure seekers. So bring your sunblock and umbrella, because Longview, Washington's weather is ready to surprise you with its unpredictable and endearing conditions.