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October Weather in Eureka, United States

Last updated: June 24, 2025

In October, the average temperature in Eureka, United States hovers around 13°C (56°F), with a wide range of temperatures that can drop as low as -3°C (26°F) or soar up to 32°C (90°F). Expect 130 mm (5.1 in) of precipitation over approximately 12 days, contributing to an average humidity of 82%. Plan accordingly for the variable weather!

October Temperature in Eureka

In October in Eureka, the average temperature is 13°C (56°F), with maximums reaching 32°C (90°F) and minimums dropping as low as -3°C (26°F). Travelers should be prepared for a wide range of temperatures, making layers essential for comfort.

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 13°C (56°F), with highs reaching up to 32°C (90°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec272941516474777470564034
Data source: Temperature data for Eureka generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

October Precipitation in Eureka

In Eureka in October, the precipitation amount is 130 mm (5.1 in) over a span of 12 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 130 mm (5.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec616810611716513810980691305655
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Eureka

In Eureka in October, humidity is 82%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making it feel much cooler than it is and creating a heavy atmosphere that can be exhausting for travelers.

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 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
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 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Eureka, you can refer to this 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 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357810111098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)61 mm (2.4 inches)82%moderate
February Weather-2°C (29°F)68 mm (2.7 inches)83%moderate
March Weather5°C (42°F)106 mm (4.2 inches)84%high
April Weather10°C (51°F)117 mm (4.6 inches)85%very high
May Weather18°C (64°F)165 mm (6.5 inches)79%very high
June Weather23°C (74°F)138 mm (5.4 inches)82%extreme
July Weather25°C (77°F)109 mm (4.3 inches)80%very high
August Weather23°C (74°F)80 mm (3.1 inches)81%very high
September Weather21°C (70°F)69 mm (2.7 inches)80%very high
October Weather13°C (56°F)130 mm (5.1 inches)82%high
November Weather4°C (40°F)56 mm (2.2 inches)88%moderate
December Weather1°C (34°F)55 mm (2.2 inches)84%low

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