2018 Long Range Weather Forecast for Cornelius, OR


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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 annual Old Farmer’s Almanac, available online and in stores.

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

Free 2-Month Weather Forecast

October 2018 Long Range Weather Forecast for Pacific Northwest
DatesWeather Conditions
Oct 1-2Sunny, cool
Oct 3-8Rainy periods, cool
Oct 9-11Sunny, warm
Oct 12-22Rainy periods, mild
Oct 23-31Periods of rain and snow, cold
Octobertemperature 53.5° (0.5° below avg.)
precipitation 3" (1" below avg. north, 1" above south)

November 2018 Long Range Weather Forecast for Pacific Northwest
DatesWeather Conditions
Nov 1-5Rainy, mild
Nov 6-9Heavy rain, cool
Nov 10-11Sunny, cool
Nov 12-19Rainy periods, cool
Nov 20-30Rainy, mild
Novembertemperature 49° (2° above avg.)
precipitation 11.5" (5" above avg.)

Annual Weather Summary
November 2018 to October 2019

Winter will be warmer and much rainier than normal, with below-normal snowfall. The coldest periods will occur in early and late December, early January, and mid- and late February, with the snowiest periods in early January and mid-February. April and May will be warmer and drier than normal. Summer will be warmer and drier than normal, with the hottest temperatures in mid- to late July and early and mid-August. September and October will be warmer and slightly drier than normal.

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 2018 to October 2019

Temperature and Precipitation Chart, November 2018 to October 2019 for Cornelius, OR

Reader Comments

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Better than

Farmer almanac, while it isn’t always perfect it is fairly accurate. More so than Al Gore.


I too asked a question about inaccurate predictions. But never got a reply.

Predicted Snowfall for Bend and Sunriver this winter?

Looking more for predicted snow fall patterns going into November-December 2018 and into the New Year. Is there a way to get this prediction here or somewhere? Not just looking for rainfall patterns, specifically snow. Thanks,

Not so good

August was waaaayyyyyy off. How certain can we be about this coming winter's precipitation? Isn't there an El Nino brewing?

Way off mark...

Mid-Willamette Valley in Oregon.... Hot, hot, hot....
No cool and sunny weather -- so far this August. No showers...
Though we might dip down from 96F to 78F in a couple of days. "Might".... if the weather predictions at Accuweather are correct.


We have gotten some rain here in Eastern Klamath county, we will have to wait and see about the snow.


Cool and sunny on coast, all ?summer?

warmer summers

You address warmer Arctic conditions and the ocean temperatures effect on the jet stream, etc. And yes, most importantly we are all in this together. The geo-engineering has an effect on our weather (and your predictions) also. What are your thoughts on geo engineering and are you able to factor it into your weather predictions?

Weather Forecasts

Thank you for your question! It’s a good one. While we do not factor in geo-engineering directly, we do take into account the last 30 years of available climate data, which would account for any short-term changes in climate due to geo-engineering. Additionally, because our forecasts are only for the following year, the effects of geo-engineering and other man-made factors that are currently occurring may not be visible for many years.

Weather for pac nw

This is incorrect info. It’s been in the mid 90’s near Kent, Renton, for the past week. Smokey and HOT!!!!