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August Weather in Eureka, United States

Last updated: June 24, 2025

In Eureka, United States, the average temperature in August hovers around 25°C (78°F). Expect a minimum of 13°C (55°F) and a sweltering maximum of 37°C (99°F). During this time, you'll encounter approximately 112 mm (4.4 in) of precipitation spread over 11 days, with average humidity levels reaching a sticky 73%.

August Temperature in Eureka

In August in Eureka, the average temperature is 25°C (78°F). Maximum temperatures can reach 37°C (99°F), while minimums can dip as low as 13°C (55°F). Travelers should be prepared for warm daytime heat and cooler evenings.

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

The chart illustrates August 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, August typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 13°C (55°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.

August Precipitation in Eureka

In Eureka in August, the precipitation amount is 112 mm (4.4 in) that occurs over the course of 11 days.

August Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Eureka, August typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec50408410020311493112771432831
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Eureka

In Eureka in August, humidity is 73%. With an average temperature of 25°C (78°F), this humidity feels like stepping into a warm, heavy blanket that wraps around you, making travel feel sluggish and requiring regular breaks to stay refreshed.

August Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Eureka is approximately 73%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Eureka

In Eureka in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Eureka.

Maximum UV Index Levels in Eureka for August

The chart shows the monthly maximum UV Index (UVI) for Eureka in August, 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 August, the maximum UV index in Eureka typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679101111109753
Data source: Eureka August 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 August 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 August’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 August’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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