Eureka (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Eureka.
Climate overview of Eureka
The climate in Eureka, California, United States of America, is remarkably consistent, with temperatures year-round averaging 16°C (61°F). The warmest month is September at 18°C (64°F), and the coolest is December at 12°C (54°F).
The city has a wet climate, receiving around 1006 mm (40 in) of rainfall per year. Despite the high annual total, it has a distinct dry season from May to September. December is the wettest month.
Eureka Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Eureka - and find the best time to visit.
Monthly Temperature in Eureka
In Eureka temperatures are generally consistent throughout the year. On average, daytime temperatures range from a pleasant 18°C (64°F) in September to a moderate 12°C (54°F) in December.
Nighttime temperatures range from 12°C (54°F) in September to 4°C (39°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Eureka
Eureka experiences significant rainfall throughout the year, averaging 1006 mm (40 in) 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 (7.8 in) of precipitation. This rainfall is distributed across 18 rainy days.
In contrast, the driest month, August, experiences much less rainfall, totaling 3.9 mm (0.2 in) 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
The average number of days each month with precipitation
Best Time to Visit Eureka
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July, August and September
- Warmest weather: June, July, August, September and October
- Fewest rainy days: June, July, August and September
- Wettest months: January, February, March, April, November and December, when rainfall is highest.
- Seasonal pattern: A distinct dry season from May to September
Frequently asked questions about the climate in Eureka
What is the best time to visit Eureka?
July, August and September typically offer the most optimal weather in Eureka. In contrast, January, February, March and December tend to have less optimal conditions. Eureka has a distinct dry season from May to September.
What temperatures can I expect in Eureka?
Daytime highs range from 12°C (54°F) in December to 18°C (64°F) in September. Nighttime lows range from 4°C (39°F) to 12°C (54°F). Temperatures stay relatively stable year-round.
How much rain does Eureka get?
Annual rainfall is around 1006 mm (40 in). December is the wettest month with 198 mm (7.8 in), while August is the driest with 3.9 mm (0.2 in).
Eureka 3-Day Forecast
Eureka (CA) 3-Day Forecast
Eureka on the map
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