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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 15°C (59°F), with fluctuations that can see minima of -3°C (26°F) and maxima reaching 34°C (93°F). This month typically experiences about 110 mm (4.3 in) of precipitation spread over 11 days, contributing to an average humidity level of 76%. Whether you're braving the chilly nights or enjoying the warm days, be prepared for a diverse climate!

October Temperature in Eureka

In October in Eureka, the average temperature is 15°C (59°F). Maximums can reach 34°C (93°F) and minimums can be as low as -3°C (26°F). Be prepared for a wide range of weather conditions if you plan to travel during this time.

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 15°C (59°F), with highs reaching up to 34°C (93°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec333647556676797672594539
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 110 mm (4.3 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 110 mm (4.3 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec75811291241448895139561107057
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 76%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities less enjoyable and often leading to a quick sense of fatigue while traveling.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%80%80%80%82%83%81%80%76%76%85%86%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110109753
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 Weather0°C (33°F)75 mm (3.0 inches)82%moderate
February Weather2°C (36°F)81 mm (3.2 inches)80%moderate
March Weather8°C (47°F)129 mm (5.1 inches)80%high
April Weather13°C (55°F)124 mm (4.9 inches)80%very high
May Weather19°C (67°F)144 mm (5.7 inches)82%very high
June Weather24°C (76°F)88 mm (3.5 inches)83%extreme
July Weather26°C (80°F)95 mm (3.7 inches)81%very high
August Weather24°C (76°F)139 mm (5.5 inches)80%very high
September Weather22°C (72°F)56 mm (2.2 inches)76%very high
October Weather15°C (59°F)110 mm (4.3 inches)76%high
November Weather7°C (45°F)70 mm (2.8 inches)85%moderate
December Weather4°C (40°F)57 mm (2.2 inches)86%moderate

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