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August Weather in Eureka, United States

Last updated: June 24, 2025

In August, the average temperature in Eureka, United States hovers around 24°C (76°F), creating a pleasant climate. You can expect a minimum of 13°C (56°F) and a maximum of 36°C (96°F), allowing for some variability in your outdoor plans. However, be prepared for some moisture, as precipitation amounts reach 139 mm (5.5 in) over 12 days, contributing to an average humidity of 80%.

August Temperature in Eureka

In August in Eureka, the average temperature is 24°C (76°F), with maximums reaching up to 36°C (96°F) and minimums dipping as low as 13°C (56°F). This makes it an ideal time for travelers looking to enjoy warm days and cool 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 24°C (76°F), with highs reaching up to 36°C (96°F) and lows dropping to around 13°C (56°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.

August Precipitation in Eureka

In Eureka, in August, the precipitation amount is 139 mm (5.5 in) over a span of 12 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 139 mm (5.5 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec75811291241448895139561107057
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 80%. With an average temperature of 24°C (76°F), this humidity feels like a warm, sticky embrace that can make exploring outdoors quite draining, so it's essential to stay hydrated and take breaks in the shade while traveling.

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 80%, 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 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.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110109753
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 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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