August Weather in Eureka, United States

Last updated: June 24, 2025

In August, the average temperature in Eureka, United States is a pleasant 26°C (79°F). However, you can expect a range from a cool 10°C (51°F) to a sizzling 40°C (104°F). With an average precipitation of 20 mm (0.8 in) spread over 2 days, and a comfortable humidity level of 34%, it's a month of delightful contrasts!

August Temperature in Eureka

In August in Eureka, the average temperature is 26°C (79°F). The maximum can reach 40°C (104°F) and the minimum can be as low as 10°C (51°F). Travelers should pack a variety of clothing to comfortably adapt to both warm and cooler temperatures during their visit.

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 26°C (79°F), with highs reaching up to 40°C (104°F) and lows dropping to around 10°C (51°F).

Data source: Temperature data for Eureka generated using information from the Copernicus Climate Change Service.

August Precipitation in Eureka

In Eureka in August, the precipitation amount is 20 mm (0.8 in) over the course of 2 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 20 mm (0.8 inches) of precipitation spread over approximately 2 days.

Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

August Humidity in Eureka

In Eureka in August, humidity is 34%. With an average temperature of 26°C (79°F), this humidity feels like a pleasant tropical breeze, making it comfortable for traveling while allowing you to enjoy outdoor activities without feeling overly sticky or fatigued.

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 34%, offering insight into how humid the weather typically is during this month.

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 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, 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 11, which falls under the extreme exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	44 mm (1.8 inches)	87%	moderate
February Weather	-1°C (30°F)	48 mm (1.9 inches)	88%	high
March Weather	4°C (39°F)	60 mm (2.4 inches)	77%	high
April Weather	10°C (50°F)	47 mm (1.8 inches)	69%	very high
May Weather	15°C (60°F)	42 mm (1.6 inches)	54%	extreme
June Weather	23°C (74°F)	10 mm (0.4 inches)	45%	extreme
July Weather	28°C (82°F)	9 mm (0.3 inches)	37%	extreme
August Weather	26°C (79°F)	20 mm (0.8 inches)	34%	extreme
September Weather	21°C (69°F)	21 mm (0.8 inches)	47%	very high
October Weather	10°C (51°F)	35 mm (1.4 inches)	67%	high
November Weather	5°C (41°F)	27 mm (1.1 inches)	82%	moderate
December Weather	-3°C (28°F)	42 mm (1.6 inches)	87%	moderate