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Eureka (CA) Weather and Climate: A Comprehensive Guide

The weather in Eureka is characterized by a steady average temperature throughout the year. It also has a relatively rainy climate with high levels of precipitation. Let’s explore the climate details in depth to provide you with a complete overview.

Average maximum day and minimum night temperature

In Eureka temperatures are generally consistent throughout the year. On average, daytime temperatures range from a pleasant 18°C in September to a moderate 12°C in December.

Nighttime temperatures can drop, with average lows reaching 4°C in December. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Eureka experiences significant rainfall throughout the year, averaging 1006 mm of precipitation annually. The seasons in Eureka, bring significant changes in precipitation. The wettest month, December, receives heavy rainfall, with an average of 198 mm of precipitation. This rainfall is distributed across 18 rainy days.

In contrast, the driest month, August, experiences much less rainfall, totaling 3.9 mm over 4 rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Eureka Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Forecast for Eureka (CA)

Mon   Dec 23
18°C | 7°C
SE 6 m/s
18 mm
broken clouds and slight rain

broken clouds and slight rain

Tue   Dec 24
12°C | 5°C
W 3 m/s
41 mm
partly cloudy and rain

partly cloudy and rain

Wed   Dec 25
12°C | 4°C
SE 6 m/s
8.1 mm
overcast and  chance of rain

overcast and chance of rain

The best time of year to visit Eureka in the United States of America

Other facts from our historical weather data:
  • Which months have the greatest rainfall in Eureka?
    Most rainfall (rainy season) is seen in March and December.
  • Does Eureka have a dry season?
    Yes, the months of July and August are very dry.
  • Which is the warmest month in Eureka?
    September has an average maximum temperature of 18°C and is the warmest month of the year.
  • Which is the coldest month in Eureka?
    The coldest month is December with an average maximum temperature of 12°C.
  • Which is the wettest month in Eureka?
    December tops the wettest month list with 198 mm of rainfall.
  • Which is the driest month in Eureka?
    August is the driest month with 4 mm of precipitation.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.