2018 Long Range Weather Forecast for Des Moines, WA

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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. If your city is located inside a region, the region's forecast will apply to you.

Free 2-Month Weather Forecast

February 2018 Long Range Weather Forecast for Pacific Northwest
DatesWeather Conditions
Feb 1-5Rainy periods, cool
Feb 6-10Showers, mild
Feb 11-16Sunny, mild
Feb 17-25Rainy periods, mild
Feb 26-28Misty, mild
Februarytemperature 47° (3° above avg.)
precipitation 3" (2" below avg.)

March 2018 Long Range Weather Forecast for Pacific Northwest
DatesWeather Conditions
Mar 1-9Rainy periods, cool
Mar 10-14Rain and snow, cool
Mar 15-17Sunny, mild
Mar 18-25Rainy periods, cool
Mar 26-31Sunny, mild
Marchtemperature 46° (1° below avg.)
precipitation 2" (2" below avg.)

Annual Weather Summary: November 2017 to October 2018

Winter will be drier and slightly colder than normal, with near- to below-normal snowfall. The coldest periods will occur from late November into early December and in late December, with the snowiest periods in early to mid- and late December. April and May will be warmer and drier than normal. Summer will be warmer and rainier than normal, with the hottest temperatures in mid-June and early and mid- to late July. September and October will be slightly cooler than normal, with rainfall near normal in the north and above normal in the south.

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 2017 to October 2018

Temperature and Precipitation Graph

Reader Comments

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Snow in February

We've got freezing temps and snow. Today is the 21st of February and it seems Oregon is being hit by a cold front this week and next. Hoping your March forecast is accurate.

More to Oregon than West portion

Ontario is on the Snake River ID/OR border as far E as you can go & still be Oregonians. We’re still considered NW. It would be good to have long range forecast even if just Boise ID about 50 milesE of us.

Ontario, Oregon

Geographically, Ontario—indeed, Oregon—is considered NW (to be in the northwest). However, for purposes of Almanac forecasts, Ontario is in the Intermountain region. Oregon falls in two of our forecast regions: The area more or less east of the Cascades is in the Intermountain region, number 13. (Intermountain being between the mountains; in this case, the Cascades and the Rockies.) The area more or less west of the Cascades is in the Pacific Northwest, number 15. The “shapes” of the regions `are based on the climatological movement of weather systems. Or, in very simplified fashion, the way the winds blow—the winds being jet streams, oscillations, etc. Inevitably some locations will “sit” on the border of two (or more) regions.

You will see, below the map on the following link page, that Ontario, Oregon, is one of the cities in Region 13: https://www.almanac.com/weather/longrange/region/us/13

Thanks for your interest in The Old Farmer’s Almanac.

Left out

Your weather forcast is totally leaving us in Central Oregon out of the picture. Our climates here range from high desert to mountain. Please include a forcast for us too! Maybe Redmond Oregon? Thank you

central Oregon

Oregon falls in two of our forecast regions: The area more or less east of the Cascades is in the Intermountain region, number 13. (Intermountain being between the mountains; in this case, the Cascades and the Rockies.) The area more or less west of the Cascades is in the Pacific Northwest, number 15. The “shapes” of the regions `are based on the climatological movement of weather systems. Or, in very simplified fashion, the way the winds blow—the winds being jet streams, oscillations, etc. Inevitably some locations will “sit” on the border of two (or more) regions. In that case, we suggest that you read the forecast for the adjacent region/s as well. And consider that our forecasts are deviations from normal, or average, conditions. (Local meteorologists might refer to above/below normal or average conditions on a given day; they are using the same calculations that we use. We are not suggesting that they use our forecasts; but the 30-year period on which norms and averages are based is universal.)

For a more specific forecast for your area (Redmond or any place), use this: https://www.almanac.com/weather/forecast