The best times to visit Eureka for ideal weather are

June 18th to September 30th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Eureka Travel Info

Weather in Eureka


Average temperatures in Eureka vary little. Considering humidity, temperatures feel cold for most of the year with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 28th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Eureka, the hottest months are August, July, and then September. See average monthly temperatures below. The warmest time of year is generally late August to early September where highs are regularly around 67.3°F (19.6°C) with temperatures rarely dropping below 49.5°F (9.7°C) at night.

Eureka Temperatures (Fahrenheit)


Eureka Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Eureka Perceived Temperature (F)


Eureka Perceived Temperature (C)



Average Eureka Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 56.2 46.5 37
Feb 55.6 47.2 38.2
Mar 56.2 48.2 39.4
Apr 56.7 48.6 39.6
May 59.1 51.5 43.8
Jun 62 54.2 47
Jul 62.9 55.8 50
Aug 63.9 56.7 50.7
Sep 65 55.6 47.4
Oct 63.8 54.2 45.4
Nov 59.5 50.2 41.1
Dec 54.7 46.4 37.6

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 13.4 8.1 2.8
Feb 13.1 8.4 3.4
Mar 13.4 9 4.1
Apr 13.7 9.2 4.2
May 15.1 10.8 6.6
Jun 16.7 12.3 8.3
Jul 17.2 13.2 10
Aug 17.7 13.7 10.4
Sep 18.3 13.1 8.6
Oct 17.7 12.3 7.4
Nov 15.3 10.1 5.1
Dec 12.6 8 3.1



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Eureka are August, July, and then September. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around mid June. For example, on the week of June 18th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid December with an average of 4 days of significant precipitation the week of December 17th.

When can you find snow in Eureka? Weather stations report a bit of annual snow likely to be deepest around December, especially close to late November to early December. The best time to ski (if at all) in Eureka is often around around November 26th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Eureka.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Eureka (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 25% 0 4.5
Feb 30% 0 4.9
Mar 39% 0 6.4
Apr 26% 0 3.3
May 10% 0 1.3
Jun 6% 0 0.8
Jul 1% 0 0.3
Aug 1% 0 0.3
Sep 5% 0 0.6
Oct 15% 0 3.1
Nov 30% 0 4.5
Dec 42% 3.1 8.3

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 25 0 11.4
Feb 30 0 12.4
Mar 39 0 16.3
Apr 26 0 8.4
May 10 0 3.3
Jun 6 0 2
Jul 1 0 0.8
Aug 1 0 0.8
Sep 5 0 1.5
Oct 15 0 7.9
Nov 30 0 11.4
Dec 42 7.9 21.1


Humidity and Wind

Eureka has some extremely humid months, and high humidity throughout the year. The least humid month is February (75.4% relative humidity), and the most humid month is August (84.6%).

Wind in Eureka is usually calm. The windiest month is May, followed by April and March. May’s average wind speed of around 5.8 knots (6.6 MPH or 10.7 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early to mid June where average top sustained speeds reach 13 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Eureka.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 3.8 Barely noticeable 7.2 Gentle breeze
Feb 4.8 Light breeze 9.4 Gentle breeze
Mar 5.6 Light breeze 10.3 Gentle breeze
Apr 5.7 Light breeze 11 Significant breeze
May 5.8 Light breeze 11.2 Gentle breeze
Jun 5.5 Light breeze 11.1 Significant breeze
Jul 4.5 Light breeze 9 Gentle breeze
Aug 4.2 Light breeze 8.3 Gentle breeze
Sep 3.9 Barely noticeable 8.1 Gentle breeze
Oct 3.8 Barely noticeable 8.1 Gentle breeze
Nov 3.9 Barely noticeable 7.2 Gentle breeze
Dec 5 Light breeze 8.9 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 76.2%
Feb 75.4%
Mar 76.4%
Apr 75.5%
May 77.7%
Jun 79.6%
Jul 83.5%
Aug 84.6%
Sep 81.3%
Oct 78.3%
Nov 77.1%
Dec 76%


Is it Safe to Travel to Eureka?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


The Busiest and Least Crowded Months

The busiest month for tourism in Eureka, CA, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Eureka in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 36.3 in December means 36.3% of the tourists vs. July.



Overall Eureka Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 60.3°F (15.7°C) and 55.3°F (12.9°C) with warmer temperatures in the later months. Rain is somewhat common with 3 to 12 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have comfortably cool weather with high temperatures that are brisk. These months see the least precipitation with 0 to 2 days of precipitation per month. June – August is the busiest season for tourism in Eureka, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 67.2°F (19.6°C) and 57.7°F (14.3°C), which will feel chilly given the humidity and wind. It rains or snows a significant amount: 2 to 9 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is too cold this time of year in Eureka to be enjoyable for warm weather travelers. The average high during this season is between 57.4°F (14.1°C) and 53.3°F (11.8°C). On average, it rains or snows a fair amount: 8 to 13 times per month. These times of year are fairly slow with tourists.


Best Times to Travelthe United States › Eureka, CA, US