July Weather in Eureka, United States

Last updated: June 24, 2025

In July, the average temperature in Eureka, United States hovers around 18°C (64°F), making it a pleasant time to visit. However, temperatures can fluctuate, with minimums dropping to 3°C (38°F) and maximums soaring to 36°C (97°F). Expect some rain, as the area receives about 23 mm (0.9 in) of precipitation over 5 days. Additionally, the air can feel quite humid, with an average humidity level of 82%.

July Temperature in Eureka

In July in Eureka, the average temperature is 18°C (64°F). Maximum temperatures can reach up to 36°C (97°F), while minimums can drop as low as 3°C (38°F). Be prepared for a wide range of temperatures during your travels, so pack accordingly!

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

The chart illustrates July 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, July typically has an average temperature of 18°C (64°F), with highs reaching up to 36°C (97°F) and lows dropping to around 3°C (38°F).

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

July Precipitation in Eureka

In Eureka in July, the precipitation amount is 23 mm (0.9 in) over the course of 5 days.

July Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Eureka, July typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 5 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

July Humidity in Eureka

In Eureka in July humidity is 82%. With an average temperature of 18°C (64°F), this humidity feels like a warm, muggy embrace that can make exploring the area feel stifling, leaving travelers drenched in sweat and longing for respite in the shade.

July Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Eureka is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Eureka

In Eureka in July, 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 July

The chart shows the monthly maximum UV Index (UVI) for Eureka in July, 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 July, the maximum UV index in Eureka typically reaches 9, which falls under the very high exposure category.

Data source: Eureka July 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 July 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 July’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 July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (20°F)	51 mm (2.0 inches)	95%	low
February Weather	-9°C (16°F)	70 mm (2.8 inches)	93%	moderate
March Weather	-2°C (29°F)	58 mm (2.3 inches)	91%	moderate
April Weather	3°C (37°F)	66 mm (2.6 inches)	88%	high
May Weather	9°C (48°F)	64 mm (2.5 inches)	83%	very high
June Weather	13°C (56°F)	68 mm (2.7 inches)	80%	very high
July Weather	18°C (64°F)	23 mm (0.9 inches)	82%	very high
August Weather	17°C (63°F)	29 mm (1.2 inches)	71%	very high
September Weather	11°C (53°F)	38 mm (1.5 inches)	71%	high
October Weather	3°C (38°F)	70 mm (2.7 inches)	85%	moderate
November Weather	-1°C (31°F)	69 mm (2.7 inches)	90%	low
December Weather	-5°C (24°F)	76 mm (3.0 inches)	96%	low