July Weather in Eureka, United States

Last updated: June 24, 2025

In Eureka, United States, the average temperature in July reaches a warm 26°C (80°F), with minimums dipping to 15°C (59°F) and soaring maximums of 40°C (105°F). Rainfall is fairly consistent, with 93 mm (3.7 in) of precipitation over 10 days. The air is humid as well, boasting an average humidity of 81%, making for a tropical atmosphere.

July Temperature in Eureka

In July in Eureka, the average temperature is 26°C (80°F). Maximums can reach 40°C (105°F), and minimums can be as low as 15°C (59°F). This weather makes Eureka an ideal destination for travelers looking to enjoy warm conditions while being prepared for cooler nights.

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 26°C (80°F), with highs reaching up to 40°C (105°F) and lows dropping to around 15°C (59°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 93 mm (3.7 in) over the course of 10 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 93 mm (3.7 inches) of precipitation spread over approximately 10 days.

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

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Millimeters (mm) Inches (in)

July Humidity in Eureka

In Eureka in July, humidity is 81%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that clings to the skin, making outdoor activities feel more strenuous and requiring frequent breaks to stay refreshed and hydrated.

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 81%, 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 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 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 11, which falls under the extreme 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	1°C (34°F)	50 mm (2.0 inches)	77%	moderate
February Weather	2°C (35°F)	40 mm (1.6 inches)	76%	high
March Weather	9°C (49°F)	84 mm (3.3 inches)	71%	high
April Weather	13°C (56°F)	100 mm (3.9 inches)	73%	very high
May Weather	19°C (66°F)	203 mm (8.0 inches)	83%	very high
June Weather	25°C (77°F)	114 mm (4.5 inches)	83%	extreme
July Weather	26°C (80°F)	93 mm (3.7 inches)	81%	extreme
August Weather	25°C (78°F)	112 mm (4.4 inches)	73%	very high
September Weather	23°C (73°F)	77 mm (3.0 inches)	67%	very high
October Weather	14°C (58°F)	143 mm (5.6 inches)	72%	high
November Weather	8°C (46°F)	28 mm (1.1 inches)	82%	moderate
December Weather	4°C (40°F)	31 mm (1.2 inches)	85%	moderate