May Weather in Eureka, United States

Last updated: June 24, 2025

In May, the average temperature in Eureka, United States hovers around 19°C (66°F). Be prepared for temperature fluctuations, as the minimum can drop to 4°C (39°F) while the maximum can soar to 35°C (95°F). With precipitation reaching 203 mm (8.0 in) over 15 days, and an average humidity of 83%, don't forget your umbrella while enjoying the pleasant climate!

May Temperature in Eureka

In May in Eureka, the average temperature is 19°C (66°F). The maximum can reach 35°C (95°F), and the minimum can be as low as 4°C (39°F). This pleasant range makes Eureka an ideal destination for travelers seeking a comfortable climate.

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

The chart illustrates May 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, May typically has an average temperature of 19°C (66°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (39°F).

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

May Precipitation in Eureka

In Eureka in May, the total precipitation amount is 203 mm (8.0 in), which falls over the course of 15 days.

May Precipitation Trends in Eureka

The chart displays monthly precipitation patterns in Eureka, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Eureka, May typically receives around 203 mm (8.0 inches) of precipitation spread over approximately 15 days.

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

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Millimeters (mm) Inches (in)

May Humidity in Eureka

In Eureka in May, humidity is 83%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making travel feel more sluggish and muggy, yet there's a refreshing coolness in the air that invites you to explore.

May Average Humidity in Eureka

This chart illustrates the average monthly humidity levels in Eureka, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Eureka is approximately 83%, offering insight into how humid the weather typically is during this month.

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

May UV Index in Eureka

In Eureka in May, 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 May

The chart shows the monthly maximum UV Index (UVI) for Eureka in May, 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 May, the maximum UV index in Eureka typically reaches 10, which falls under the very high exposure category.

Data source: Eureka May 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 May 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 May’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 May’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