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August Weather in Eureka, United States

Last updated: June 24, 2025

In August, the average temperature in Eureka, United States is a mild 23°C (74°F). However, temperatures can vary significantly, ranging from a cool 12°C (54°F) to a hot 36°C (96°F). Expect about 80 mm (3.1 in) of precipitation spread over 10 days, contributing to an average humidity of 81%.

August Temperature in Eureka

In August in Eureka, the average temperature is 23°C (74°F). The maximum can reach 36°C (96°F), while the minimum can be as low as 12°C (54°F). This pleasant temperature range makes Eureka an ideal destination for both outdoor adventures and leisurely activities.

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 23°C (74°F), with highs reaching up to 36°C (96°F) and lows dropping to around 12°C (54°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.

August Precipitation in Eureka

In Eureka in August, the total precipitation amount is 80 mm (3.1 in) over a period of 10 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 80 mm (3.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec616810611716513810980691305655
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 81%. With an average temperature of 23°C (74°F), this humidity feels like a warm, heavy blanket draped over your skin, making travel feel a bit more sluggish and requiring plenty of water breaks to stay comfortable.

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 81%, 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 August generated using information from the Copernicus Climate Change Service.

August UV Index in Eureka

In Eureka in August, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357810111098642
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 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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