2019-2020 Long Range Weather Forecast for Seattle, WA

Get the Long Range Weather for Your Location

See long range weather forecasts for the next 60 days from The Old Farmer’s Almanac! Our long range forecasts can be used to make more informed decisions about future plans that depend on the weather, from vacations and weddings to sporting events and outdoor activities.

To see long term forecasts for the entire year, pick up a copy of The 2020 Old Farmer’s Almanac, available online and in stores.

Note: Long range forecasts are regional, not city-specific.

Free 2-Month Weather Forecast

September 2019 Long Range Weather Forecast for Pacific Northwest
DatesWeather Conditions
Sep 1-5Showers, then sunny, cool
Sep 6-18Sunny, turning hot
Sep 19-27Scattered showers, cool
Sep 28-30Sunny, cool
Septembertemperature 64° (3° above avg.)
precipitation 0.5" (1" below avg.)

October 2019 Long Range Weather Forecast for Pacific Northwest
DatesWeather Conditions
Oct 1-3Showers, warm
Oct 4-11Sunny, mild
Oct 12-17Showers, then sunny, cool
Oct 18-23Rainy periods, mild
Oct 24-31Rainy periods; cool, then mild
Octobertemperature 56° (2° above avg.)
precipitation 3" (avg.)

Annual Weather Summary
November 2019 to October 2020

Winter will be warmer and rainier than normal, with below-normal snowfall. The coldest periods will occur in mid- to late December, early and mid- to late January, mid-February, and mid- to late March. The snowiest periods will occur in mid-December and early and mid- to late January. April and May will have near-normal temperatures, with below-normal rainfall. Summer will have slightly above-normal temperatures, on average, with above-normal precipitation. The hottest periods will be in late June, mid-July, and late August. September and October will be warmer and rainier than normal. The hottest periods will be in early and mid-September.

Map showing Old Farmer's Almanac long range weather region number 15

About the Pacific Northwest Region

The Pacific Northwest long range weather region includes all or part of the following states: CALIFORNIA (Arcata, Eureka, Fortuna, McKinleyville, Yreka), OREGON (Beaverton, Eugene, Gresham, Portland, Salem), WASHINGTON (Bellevue, Everett, Seattle, Tacoma, Vancouver).

Pacific Northwest Neighboring Regions

Here are the regions that neighbor the Pacific Northwest long range weather region:

Temperature and Precipitation November 2019 to October 2020

Temperature and Precipitation Chart, November 2019 to October 2020 for Seattle, WA

Reader Comments

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Washington - Oregon October Trip

This is good info. I live in Hawaii, my girlfriend and I will be traveling in starting October 9 from Seattle to Olympic National Park, down the coast, Oregon Coast, Mt. Hood area, then to Portland. Trying to figure out what the weather might be like. From what I gather here and in the comments, it'll be wet and might be a little chilly. That's OK with us, as long as we can still hike and explore. Hopefully we get some nice fall-type of foliage and beauty.

Reply to Ben in Hawaii

You are coming to the PNW atvthe best time for Fall foliage! Make sure you allow plenty of time for the Columbia Gorge on your way up to Mt. Hood. Stop by Crown Pointe for spectacular photo ops, Multnomah Falls, Bonneville Dam & the fish hatchery where Herman the Sturgeon (over 5 feet long) lives, the wine & fruit orchards on the "Fruit Loop" then on your return, cross over the "Bridge of the Gods" at Cascade Locks and come west on highway 14 in Washington so you can see across the river, different viewpoint. You can get back across on I-205 or I-5 back to Portland. Honestly, don't waste your time IN Portland. The real PNW is all around it!

Very cool/cold Summer in Eureka Calif.

The days have been around 59-64 degrees on average during the day and the night temps much cooler and misty. Two weeks ago the leaves began turning a lovely deep maroon, orange, and red. I think winter will be early this year and very wet.

Early Fall

I have noticed some trees and bushes are already changing color. Are we in for an early Fall/Winter?

early fall/winter

I was just commenting to my Husband tonight I think it will be an early winter. My cat is already blowing coat. Normally that doesn't happen until Late September Early October. I can usually tell what's in store by the animals coats. Call me crazy. I'm on the Oregon Coast.

I'm in the willamete valley

I'm in the willamete valley and my border collie is shedding like mad already as well.

Fall/Winter Forecast for 2019-2020

When do you expect to release the Fall/Winter forecast for 2019-2020???

2019-2019 Fall and Winter Forecast

Hi Marsha, As of this week, The 2020 Old Farmer’s Almanac is shipping! You can find it exclusively on Almanac.com https://store.almanac.com/2020-farmers-almanac-buy  The 2020 edition will be in retail stores in late August! Enjoy! 

Inaccurate June forecast???

June was reported to have been the hottest June in the 100+ years of recording. I'd say comments to the contrary may be a little off.

Inaccurate Summer Forcast

It may be the hottest summer elsewhere and I don't doubt it... but here in Seattle it has been cool. That's what I was asking about. It has been so unusual, everyone has noticed. I am just curious if the hotter weather elsewhere is affecting us here..

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