Weather
Pacific Northwest Halloween 2026: Washington–Oregon Rain or Snow Oct. 31?
Seattle, WA – Halloween week could bring a cooler, wetter pattern to parts of the Pacific Northwest, raising questions about whether trick or treaters will need rain jackets, warmer costumes or umbrel
By Marcus Hale · 2026-10-18T08:28:13.793Z
Seattle, WA – Halloween week could bring a cooler, wetter pattern to parts of the Pacific Northwest, raising questions about whether trick or treaters will need rain jackets, warmer costumes or umbrellas Saturday, Oct. 31. While much of the country favors unusually warm conditions, Washington and Oregon could experience a different late October weather pattern.
According to the National Oceanic and Atmospheric Administration's Climate Prediction Center, its 8 14 day outlook issued Saturday, Oct. 17, indicates increased precipitation potential across portions of the western United States from Sunday, Oct. 25, through Saturday, Oct. 31.
The temperature outlook also suggests cooler conditions could develop closer to the Pacific Coast, contrasting with the widespread above normal warmth favored across the central and eastern United States.
Will Halloween bring rain and colder temperatures?
For families around Seattle, Tacoma, Portland, Eugene and Spokane, the early outlook raises the possibility of unsettled weather during Halloween week.
Western Washington and Oregon could experience periods of rain if Pacific storm systems move inland, while cooler air may bring temperatures closer to or below seasonal averages in some communities.
However, the outlook does not establish whether rain will fall during Saturday evening's trick or treating hours.
Could snow develop in the mountains?
Higher elevations of the Cascades and northern Rockies could experience snow if sufficient moisture combines with colder temperatures.
Mountain passes could also face changing travel conditions if a colder storm system develops, although no specific Halloween snowfall amounts or travel disruptions can be determined from the longer range outlook.
For lower elevation communities, rain would generally be the more likely precipitation type if storms arrive.
The Pacific Northwest remains an area to watch as Halloween approaches, particularly because its potential cooler, wetter pattern differs from the widespread warmth expected farther east.
Families should monitor updated forecasts closer to Oct. 31 for specific evening temperatures, rain chances and possible mountain snow.