Longview, WA 14 Day Weather © 2023. Longview WA 14 Day Weather Forecast - Long range, extended 98632 Longview, Washington 14 Day weather forecasts and current. 18° 8° Thu 5th 22° 9° Fri 6th 25° 9° Sat 7th 25° 10° Sun 8th 22° 12° Mon 9th 16° 11° Tue 10th 15° 9° Wed 11th 15° 7° Thu 12th 13° 9° Fri 13th 13° 8° Sat 14th 14°.