2018 Long Range Weather Forecast for Arcata, CA


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How to Read Long Range Weather Forecasts

Our long-range forecasts show weather trends in temperatures and precipitation. For example, will the winter be colder or warmer than average? Will there be more or less snow than what's typical for your area? Our famous predictions (traditionally 80% accurate) are made 18 months in advance, and meant to help you make more informed decisions for long-term planning.

Here on Almanac.com, we provide free long-range forecasts for the next 30 to 60 days covering U.S. and Canadian regions. Find all 12 months of predictions in the annual Old Farmer's Almanac.

Free 2-Month Weather Forecast

DECEMBER 2017: temperature 41° (2° below avg.); precipitation 8.5" (2" above avg.); Dec 1-3: Sunny, frigid; Dec 4-7: Snowstorm, then sunny, cold; Dec 8-20: Rain, some heavy, turning mild; Dec 21-26: Showers, mild; Dec 27-31: Snow, then sunny, frigid.

JANUARY 2018: temperature 43° (avg.); precipitation 5" (1" below avg.); Jan 1-3: Rain and snow showers; Jan 4-9: Rain, some heavy, turning mild; Jan 10-17: Rainy periods, cool; Jan 18-21: Sunny, cool; Jan 22-31: Rainy periods, cool.

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