October Weather in Eureka, United States

Last updated: June 24, 2025

In October, the average temperature in Eureka, United States hovers around 3°C (38°F), with extremes ranging from a chilling -19°C (-2°F) to a warm 23°C (73°F). Expect 70 mm (2.7 in) of precipitation spread over 11 days, accompanied by a high average humidity of 85%. Prepare for a month where cozy layers are essential!

October Temperature in Eureka

In October in Eureka, the average temperature is 3°C (38°F). Maximums can reach 23°C (73°F), while minimums can drop as low as -19°C (-2°F). Be sure to pack layers for your trip, as the weather can vary greatly throughout the day.

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 3°C (38°F), with highs reaching up to 23°C (73°F) and lows dropping to around -19°C (-2°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 70 mm (2.7 in) spread over 11 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 70 mm (2.7 inches) of precipitation spread over approximately 11 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 85%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable as you contend with the heavy, cold air surrounding you.

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 85%, 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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Eureka for better planning.

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 4, which falls under the moderate 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	-7°C (20°F)	51 mm (2.0 inches)	95%	low
February Weather	-9°C (16°F)	70 mm (2.8 inches)	93%	moderate
March Weather	-2°C (29°F)	58 mm (2.3 inches)	91%	moderate
April Weather	3°C (37°F)	66 mm (2.6 inches)	88%	high
May Weather	9°C (48°F)	64 mm (2.5 inches)	83%	very high
June Weather	13°C (56°F)	68 mm (2.7 inches)	80%	very high
July Weather	18°C (64°F)	23 mm (0.9 inches)	82%	very high
August Weather	17°C (63°F)	29 mm (1.2 inches)	71%	very high
September Weather	11°C (53°F)	38 mm (1.5 inches)	71%	high
October Weather	3°C (38°F)	70 mm (2.7 inches)	85%	moderate
November Weather	-1°C (31°F)	69 mm (2.7 inches)	90%	low
December Weather	-5°C (24°F)	76 mm (3.0 inches)	96%	low