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May Weather in Eureka, United States

Last updated: June 24, 2025

The average temperature in Eureka, United States during May is a comfortable 18°C (64°F). However, be prepared for a range as temperatures can swing from a chilly -1°C (31°F) to a scorching 35°C (95°F). You can expect around 165 mm (6.5 in) of precipitation over 16 days, contributing to an average humidity level of 79%. Plan accordingly for both sun and showers!

May Temperature in Eureka

In May in Eureka, the average temperature is 18°C (64°F). Maximums can reach up to 35°C (95°F), while minimums can drop as low as -1°C (31°F). Be prepared for a wide range of temperatures when traveling during this time.

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 18°C (64°F), with highs reaching up to 35°C (95°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec272941516474777470564034
Data source: Temperature data for Eureka generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Eureka

In Eureka in May, the precipitation amount is 165 mm (6.5 in) over a period of 16 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 165 mm (6.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec616810611716513810980691305655
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Eureka

In Eureka in May, humidity is 79%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace that can make outdoor activities more challenging but also creates a lush, vibrant atmosphere that's perfect for exploring local culture and scenery.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
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.
JanFebMarAprMayJunJulAugSepOctNovDec357810111098642
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.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)61 mm (2.4 inches)82%moderate
February Weather-2°C (29°F)68 mm (2.7 inches)83%moderate
March Weather5°C (42°F)106 mm (4.2 inches)84%high
April Weather10°C (51°F)117 mm (4.6 inches)85%very high
May Weather18°C (64°F)165 mm (6.5 inches)79%very high
June Weather23°C (74°F)138 mm (5.4 inches)82%extreme
July Weather25°C (77°F)109 mm (4.3 inches)80%very high
August Weather23°C (74°F)80 mm (3.1 inches)81%very high
September Weather21°C (70°F)69 mm (2.7 inches)80%very high
October Weather13°C (56°F)130 mm (5.1 inches)82%high
November Weather4°C (40°F)56 mm (2.2 inches)88%moderate
December Weather1°C (34°F)55 mm (2.2 inches)84%low

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