Long-Range Weather Forecast for Scappoose, OR

May 2026 Long Range Weather Forecast for Pacific Northwest

Dates	Weather Conditions
May 1-6	Isolated showers, then sunny; cool
May 7-13	Rainy periods, cool
May 14-18	Sunny, then a few showers; warm
May 19-21	Sunny, warm
May 22-31	A few showers, cool north; sunny, warm south
May	temperature 56° (1° below avg. north, 1° above south) precipitation 2.5" (0.5" above avg.)

June 2026 Long Range Weather Forecast for Pacific Northwest

Dates	Weather Conditions
Jun 1-3	Rainy; cool north, warm south
Jun 4-16	Scattered showers; cool north, warm south
Jun 17-23	Sunny, warm
Jun 24-30	Isolated showers, turning cool
June	temperature 60° (2° below avg. north, avg. south) precipitation 2" (0.5" above avg.)

12-Month Long-Range Weather Outlook

November 2025 to October 2026

Winter will be warmer than normal, with the coldest periods in late November, early December, and early February. Precipitation and snowfall will be below average, with the snowiest period in early February. April and May will be cooler than normal in the north and warmer south. Precipitation will be below normal. Summer will be cooler and wetter than normal in the north, while southern areas will be hotter and drier than normal. The hottest periods will be in mid- and late July and early and late August. September and October will be cooler and wetter than usual.

See the complete 12-month weather forecast in The Old Farmer’s Almanac..

Weather Trend Graph

November 2025 to October 2026