Eureka (CA) Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore Eureka’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.
Monthly Temperature Averages
In Eureka temperatures are generally consistent throughout the year. Typically, maximum daytime temperatures range from a pleasant 18°C in September to a moderate 12°C in the coolest month, December. Nights are cooler, with temperatures generally dropping to 4°C, particularly during the colder months.
The chart below illustrates the average maximum day and minimum night temperatures in Eureka by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM. During this time the sun's heating effect is the strongest.
The chart below shows the average temperature throughout the year:
December, the city’s coldest month, receives about 198 mm of rainfall spread over roughly 18 days. For more information, please visit our Eureka Precipitation page.
Annual Temperatures in the United States of America Compared
The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.
very warm
warm
pleasant
moderate
cold
very cold
Eureka Temperatures Compared World Wide
Eureka’s average annual maximum temperature is 16°C. Let’s compare this with some popular tourist destinations:
Seville, Spain, stands out with its warm Mediterranean climate and an average annual temperature of 23°C.
In Toronto, Canada, the average annual temperature is 13°C, with snowy winters and warm summers.
Chicago, USA, has a significant seasonal range, with an average annual temperature of 15°C.
Adelaide, Australia, enjoys warm summers and mild winters, with an average annual temperature of 21°C.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Global Warming and Its Effects
Climate change is affecting worldwide temperatures, including in Eureka. It has massive impacts on both local and global levels:
- Global Temperature Rise: The average global land and sea temperatures have risen by about 1.2°C since pre-industrial times.
-
Local Impacts: Most regions of the world are witnessing warmer winters with fewer frost and snowfall days. The global frequency and severity of heatwaves have increased. For example, Europe's summers of 2018, 2019, and 2020 all broke records. Summers are also becoming drier; however, during winter, inland regions have experienced increased rainfall. This has caused elevated river levels and more cases of flooding.
Many countries are experiencing earlier springs and later autumns. This is why some bird species have shifted their migration dates.
For more detailed information about Eureka’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Eureka climate page.
Current temperature in Eureka (CA)
3 m/s
broken clouds and rain
6 m/s
overcast and slight rain
6 m/s
overcast and heavy rain
