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October Weather in Eureka, United States

Last updated: June 24, 2025

In Eureka, United States, the average temperature in October is a mild 14°C (58°F). However, temperatures can vary significantly, with a minimum of -4°C (25°F) and a maximum soaring to 33°C (92°F). During this month, you can expect about 143 mm (5.6 in) of precipitation spread over 11 days, making the atmosphere quite humid, with an average humidity of 72%.

October Temperature in Eureka

In October in Eureka, the average temperature is 14°C (58°F). Maximum temperatures can reach 33°C (92°F), while minimums can drop as low as -4°C (25°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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 14°C (58°F), with highs reaching up to 33°C (92°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec343549556677807773584639
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 total precipitation amount reaches 143 mm (5.6 in) over the course of 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 143 mm (5.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec50408410020311493112771432831
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 72%. With an average temperature of 14°C (58°F), this humidity feels like a damp blanket wrapping around you, making walking and exploring slightly uncomfortable and requiring frequent breaks for hydration.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec77%76%71%74%83%83%81%73%67%72%82%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
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 Weather1°C (34°F)50 mm (2.0 inches)77%moderate
February Weather2°C (35°F)40 mm (1.6 inches)76%high
March Weather9°C (49°F)84 mm (3.3 inches)71%high
April Weather13°C (56°F)100 mm (3.9 inches)73%very high
May Weather19°C (66°F)203 mm (8.0 inches)83%very high
June Weather25°C (77°F)114 mm (4.5 inches)83%extreme
July Weather26°C (80°F)93 mm (3.7 inches)81%extreme
August Weather25°C (78°F)112 mm (4.4 inches)73%very high
September Weather23°C (73°F)77 mm (3.0 inches)67%very high
October Weather14°C (58°F)143 mm (5.6 inches)72%high
November Weather8°C (46°F)28 mm (1.1 inches)82%moderate
December Weather4°C (40°F)31 mm (1.2 inches)85%moderate

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