October Weather in Eureka, United States

Last updated: June 24, 2025

In October, the average temperature in Eureka, United States hovers around 9°C (48°F). During this month, you might experience a chilly minimum of -14°C (7°F), with the potential for warmer days peaking at 27°C (82°F). Expect about 22 mm (0.9 in) of precipitation spread over 3 days, contributing to an average humidity of 61%. Stay prepared for the variety of weather this month can bring!

October Temperature in Eureka

In October in Eureka, the average temperature is 9°C (48°F), with maximums reaching up to 27°C (82°F) and minimums dropping as low as -14°C (7°F). Travelers should be prepared for a wide range of temperatures, making it advisable to pack layers for comfort during their stay.

October Weather in Eureka: Daily Temperature Highs, Lows, and Averages

The chart illustrates October temperature patterns in Eureka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Eureka, October typically has an average temperature of 9°C (48°F), with highs reaching up to 27°C (82°F) and lows dropping to around -14°C (7°F).

Data source: Temperature data for Eureka generated using information from the Copernicus Climate Change Service.

October Precipitation in Eureka

In Eureka in October, the precipitation amount is 22 mm (0.9 in) over a span of 3 days.

October Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Eureka, October typically receives around 22 mm (0.9 inches) of precipitation spread over approximately 3 days.

Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

October Humidity in Eureka

In Eureka in October humidity is 61%. With an average temperature of 9°C (48°F), this humidity feels like a chilly embrace, making travel slightly uncomfortable as the damp air clings to your skin, requiring layers to stay warm while you explore.

October Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Eureka is approximately 61%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for October generated using information from the Copernicus Climate Change Service.

October UV Index in Eureka

In Eureka in October, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Eureka.

Maximum UV Index Levels in Eureka for October

The chart shows the monthly maximum UV Index (UVI) for Eureka in October, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In October, the maximum UV index in Eureka typically reaches 7, which falls under the high exposure category.

Data source: Eureka October UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How October Weather in Eureka Compares to Other Months

Weather in Eureka varies notably across the year, with each month offering distinct climate conditions. This page compares October’s weather to other months in Eureka, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Eureka, showing how October’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	29 mm (1.1 inches)	84%	moderate
February Weather	-3°C (27°F)	29 mm (1.1 inches)	87%	high
March Weather	1°C (35°F)	57 mm (2.3 inches)	80%	very high
April Weather	8°C (46°F)	39 mm (1.5 inches)	71%	very high
May Weather	12°C (55°F)	39 mm (1.5 inches)	55%	extreme
June Weather	20°C (68°F)	10 mm (0.4 inches)	51%	extreme
July Weather	25°C (77°F)	16 mm (0.6 inches)	41%	extreme
August Weather	24°C (75°F)	9 mm (0.3 inches)	32%	extreme
September Weather	18°C (65°F)	12 mm (0.5 inches)	41%	very high
October Weather	9°C (48°F)	22 mm (0.9 inches)	61%	high
November Weather	4°C (39°F)	22 mm (0.8 inches)	79%	moderate
December Weather	-3°C (26°F)	29 mm (1.1 inches)	83%	moderate