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Eureka, California
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The Climate of Eureka California
   The climate of Eureka is completely maritime with high humidity prevailing throughout the year. The rainy season lasts from October through April, accounting for about 90 percent of the annual precipitation. The dry season, lasting from May through September, is typically marked by regular intrusions of low clouds and fog.

     Temperatures are quite moderate, and the annual range is one of the smallest in the lower 48 states. The record high in Eureka is 87F while the record low is 20F. During a typical year, the colder lows are in the mid 30s and the warmer highs will reach the mid 70s. The reason for the small temperature range is the close proximity of Eureka to the Pacific ocean. The prevailing northwest wind blows across the cold up-welling water that is almost always present along the Humboldt County coast.

    While the immediate coast is largely affected by the cold California current, locations inland can have a much greater range of temperature. Areas just over the coastal mountains, or about 40 miles east of Eureka, can experience winter lows in the single digits and teens and summer highs from 100 to 110 degrees!

   During the warm season, typically from June to October, northerly winds prevail over the coastal waters as a semi-permanent ridge dominates over the Eastern Pacific and a semi-permanent Heat Low develops over interior California. In the cool season, the North Coast periodically sees strong southerly winds as East Pacific storms make landfall.

US Dept of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
Eureka Weather Forecast Office
300 Startare Drive
Eureka, California 95501

Tel: (707) 443-6484

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