May Weather in Eureka, United States

Last updated: June 24, 2025

In May, the average temperature in Eureka, United States hovers around 13°C (56°F). You can expect a temperature range with a minimum of -4°C (26°F) and a maximum of 34°C (94°F). During this month, the area receives an average precipitation of 57 mm (2.2 in) over approximately 9 days, accompanied by a relatively high average humidity of 76%.

May Temperature in Eureka

In May, in Eureka, the average temperature is 13°C (56°F). Maximum temperatures can reach 34°C (94°F), while minimums can drop as low as -4°C (26°F). Overall, travelers should be prepared for a wide range of temperatures and pack accordingly for both warm and cold conditions.

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 13°C (56°F), with highs reaching up to 34°C (94°F) and lows dropping to around -4°C (26°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 57 mm (2.2 in) over the course of 9 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 57 mm (2.2 inches) of precipitation spread over approximately 9 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 76%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket enveloping you, making travel a bit uncomfortable as you navigate through the heavy, moisture-laden air.

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 76%, 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 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 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 9, 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	-10°C (15°F)	14 mm (0.6 inches)	81%	low
February Weather	-11°C (13°F)	17 mm (0.7 inches)	85%	moderate
March Weather	-1°C (30°F)	29 mm (1.1 inches)	76%	moderate
April Weather	4°C (40°F)	43 mm (1.7 inches)	79%	high
May Weather	13°C (56°F)	57 mm (2.2 inches)	76%	very high
June Weather	21°C (70°F)	59 mm (2.3 inches)	81%	very high
July Weather	23°C (74°F)	63 mm (2.5 inches)	82%	very high
August Weather	21°C (70°F)	102 mm (4.0 inches)	82%	very high
September Weather	16°C (62°F)	69 mm (2.7 inches)	77%	very high
October Weather	7°C (44°F)	63 mm (2.5 inches)	76%	moderate
November Weather	0°C (32°F)	14 mm (0.5 inches)	84%	moderate
December Weather	-6°C (22°F)	27 mm (1.1 inches)	81%	low