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Best time to visit Eureka, CA, USA

Our verdict

The best time to visit Eureka is November

Eureka is a place lots of people visit almost all year round, but if you’re looking for the best time to go, November is definitely the time you should visit. This is based on a number of factors such as the weather, cost of flights and accommodation, peak travel periods and more.

The warmest month of the year in Eureka is July, where the average temperature gets to around 20℃ (69℉), but temperatures can reach as high as 22℃ (72℉) on the hottest days in summer. The weather at night in the winter, which is around February-time, can get down to a minimum of 4℃ (40℉).

The days are longest in Eureka in August, so if you want to see the sights during the day when the sun is up for the longest time, it’s best to visit around that time of year. The wet season in Eureka falls around December, so if you prefer the dryer weather, you should look to visit in July instead.

Learn more about when to travel to Eureka, the monthly weather breakdown, FAQs and much more below. Once you’ve decided when you want to go, use our handy tools to find the best prices to suit your budget on flights, transport/transfers, places to stay, and loads more!

Warmest month

July

Least rainfall

July

Most daylight

August

Eureka seasons

Before you continue, it’s important to know when the seasons are in Eureka as they might be different to yours depending on where in the world you’re travelling from. Eureka is in the Northern Hemisphere, so the seasons fall during these months:

SeasonMonths
Summer June to August
Autumn/fall September to November
Winter December to February
Spring March to May

Average temperatures in Eureka

If the temperature is a big factor for you to help you decide when to visit, the chart below shows the average minimum and maximum temperatures in Eureka for each month side-by-side so you can easily see the difference in weather throughout the year. To see the temperatures in both Celsius (°C) and Fahrenheit (°F), hover or tap the shaded boxes on the graph.

Eureka climate by month

If you already have a rough idea about which months you might want to travel, the section below shows a detailed breakdown of the climate in Eureka for each month so you can see if it all suits your wants and needs. Scroll down, or use the quick menu below to jump to your preferred month.

Jump to:

JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC

Eureka in January

  • Average temperature: 9℃ (49℉)
  • Average high temperature: 12℃ (54℉)
  • Average low temperature: 7℃ (44℉)
  • Average humidity: 78%
  • Average sunny days: 20 days
  • Average rainfall: 32mm (1") over 10 days
20 days
of pure sunshine
10 days
of showers or rain

What to pack: If you’re heading to Eureka in January, make sure you pack a warm jacket or coat.


Eureka in February

  • Average temperature: 9℃ (48℉)
  • Average high temperature: 12℃ (53℉)
  • Average low temperature: 6℃ (43℉)
  • Average humidity: 80%
  • Average sunny days: 18 days
  • Average rainfall: 28mm (1") over 9 days
18 days
of pure sunshine
9 days
of showers or rain

What to pack: If you’re heading to Eureka in February, make sure you pack a warm jacket or coat.


Eureka in March

  • Average temperature: 9℃ (48℉)
  • Average high temperature: 12℃ (54℉)
  • Average low temperature: 6℃ (43℉)
  • Average humidity: 82%
  • Average sunny days: 18 days
  • Average rainfall: 26mm (1") over 11 days
18 days
of pure sunshine
11 days
of showers or rain

What to pack: If you’re heading to Eureka in March, make sure you pack a warm jacket or coat.


Eureka in April

  • Average temperature: 10℃ (50℉)
  • Average high temperature: 13℃ (56℉)
  • Average low temperature: 7℃ (45℉)
  • Average humidity: 80%
  • Average sunny days: 20 days
  • Average rainfall: 18mm (1") over 9 days
20 days
of pure sunshine
9 days
of showers or rain

What to pack: If you’re heading to Eureka in April, make sure you pack a warm jacket or coat.


Eureka in May

  • Average temperature: 12℃ (54℉)
  • Average high temperature: 15℃ (60℉)
  • Average low temperature: 8℃ (47℉)
  • Average humidity: 81%
  • Average sunny days: 23 days
  • Average rainfall: 17mm (1") over 6 days
23 days
of pure sunshine
6 days
of showers or rain

What to pack: If you’re heading to Eureka in May, make sure you pack a warm jacket or coat.


Eureka in June

  • Average temperature: 14℃ (57℉)
  • Average high temperature: 18℃ (64℉)
  • Average low temperature: 10℃ (50℉)
  • Average humidity: 81%
  • Average sunny days: 26 days
  • Average rainfall: 3mm (0") over 3 days
26 days
of pure sunshine
3 days
of showers or rain

What to pack: If you’re heading to Eureka in June, make sure you pack a warm jacket or coat.


Eureka in July

  • Average temperature: 16℃ (60℉)
  • Average high temperature: 20℃ (68℉)
  • Average low temperature: 11℃ (53℉)
  • Average humidity: 80%
  • Average sunny days: 27 days
  • Average rainfall: 3mm (0") over 2 days
27 days
of pure sunshine
2 days
of showers or rain

What to pack: If you’re heading to Eureka in July, make sure you pack a coat or jumper for the evenings and some light clothes for the daytime.


Eureka in August

  • Average temperature: 16℃ (60℉)
  • Average high temperature: 20℃ (69℉)
  • Average low temperature: 12℃ (53℉)
  • Average humidity: 81%
  • Average sunny days: 27 days
  • Average rainfall: 3mm (0") over 2 days
27 days
of pure sunshine
2 days
of showers or rain

What to pack: If you’re heading to Eureka in August, make sure you pack a coat or jumper for the evenings and some light clothes for the daytime.


Eureka in September

  • Average temperature: 15℃ (59℉)
  • Average high temperature: 20℃ (68℉)
  • Average low temperature: 11℃ (52℉)
  • Average humidity: 77%
  • Average sunny days: 26 days
  • Average rainfall: 6mm (0") over 4 days
26 days
of pure sunshine
4 days
of showers or rain

What to pack: If you’re heading to Eureka in September, make sure you pack a warm jacket or coat.

Eureka in October

  • Average temperature: 13℃ (56℉)
  • Average high temperature: 17℃ (63℉)
  • Average low temperature: 10℃ (50℉)
  • Average humidity: 76%
  • Average sunny days: 25 days
  • Average rainfall: 13mm (1") over 5 days
25 days
of pure sunshine
5 days
of showers or rain

What to pack: If you’re heading to Eureka in October, make sure you pack a warm jacket or coat.


Eureka in November

  • Average temperature: 11℃ (51℉)
  • Average high temperature: 14℃ (57℉)
  • Average low temperature: 8℃ (46℉)
  • Average humidity: 78%
  • Average sunny days: 22 days
  • Average rainfall: 25mm (1") over 7 days
22 days
of pure sunshine
7 days
of showers or rain

What to pack: If you’re heading to Eureka in November, make sure you pack a warm jacket or coat.


Eureka in December

  • Average temperature: 9℃ (48℉)
  • Average high temperature: 12℃ (53℉)
  • Average low temperature: 6℃ (43℉)
  • Average humidity: 78%
  • Average sunny days: 19 days
  • Average rainfall: 44mm (2") over 11 days
19 days
of pure sunshine
11 days
of showers or rain

What to pack: If you’re heading to Eureka in December, make sure you pack a warm jacket or coat.


Top FAQs

The hottest month of the year in Eureka is usually July, where temperatures tend to rise to around 20℃ (69℉) in the middle of the day or early afternoon.
The month with the least amount of rain in Eureka is generally around July. The dry season often coincides with cooler weather, so you should check the temperatures in July first to make sure it’s still a good time to go.
The rainiest time of year in Eureka is generally around December, although the wetter season can sometimes extend a few months either side of December too.
If you want to get the most out of your time visiting Eureka, or if you're just afraid of the dark, the days in August are usually the longest between sunrise and sunset.

Eureka map