UV Index in Eureka, United States

Last updated: July 2, 2025

Understanding the UV Index in Eureka, United States is crucial for protecting your skin and overall health. With peak UV levels reaching a high of 12 during the day, awareness of these readings is essential to prevent sunburn and long-term skin damage. Eureka's Dfb climate, characterized by moderately warm summers, can expose residents and visitors to significant UV radiation, especially during mid-day. By keeping an eye on the UV Index, you can enjoy the beautiful outdoor experiences this charming city offers while taking the necessary precautions to safeguard your skin.

Hourly UV Index in Eureka

The UV Index today is on a dramatic ascent, starting from a mild 1 at 7:00 AM and ramping up to a peak of 12 between 1:00 PM and 2:00 PM. As the sun rises higher in the sky, the intensity of UV radiation becomes increasingly potent, with readings of 10 at 12:00 PM and 8 at 11:00 AM signaling the importance of sun protection during these hours. After hitting its zenith, the index begins to decline, dropping back to 5 by 5:00 PM and gradually returning to a low 1 by 7:00 PM. This pattern illustrates the need for vigilance against UV exposure, especially during the midday peak.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	12	extreme	10 min
14:00	12	extreme	10 min
15:00	10	very high	15 min
16:00	8	very high	15 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Eureka

The UV Index exhibits marked seasonal changes, peaking during the summer months. High-risk months are April through August, where values reach their maximum at UV Index 12, indicating an extreme exposure category with a burn time of just 10 minutes. Visitors and residents are strongly advised to take precautions during these months, including wearing sunscreen, protective clothing, and seeking shade, especially during midday hours. Conversely, from November to March, the UV Index generally remains moderate to high, with the lowest values occurring in December. It's essential to stay vigilant year-round, as UV radiation can still pose risks even during the cooler months.

Monthly Maximum UV Index for Eureka, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Eureka. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.

Data source: Statistical UV Index data for Eureka, based on 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.

Compare Eureka UV Index with Other United States Cities

The table above highlights how UV exposure in Eureka compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Eureka's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Eureka	4	6	7	10	11	12	12	11	9	7	5	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5