UV Index in Eureka, United States

Last updated: May 3, 2025

Understanding the UV Index in Eureka, United States is crucial for protecting your skin and overall health. With UV levels often peaking between 11 AM and 2 PM—reaching a maximum of 10—it's vital to be aware of how sunlight can lead to sunburns and long-term skin damage, especially during the warmer months. Eureka, classified within the Csb climate zone, enjoys a moderate coastal climate but still exposes residents to potential UV risks, particularly during sunny days. By staying informed about the UV Index, you can take proactive steps to safeguard your skin and enjoy the outdoors safely.

Hourly UV Index in Eureka

The UV Index reveals a dynamic ascent and descent throughout the day, peaking with intensity during midday. Starting at a gentle 1 at 7:00 AM, it climbs steadily, reaching 10 by 1:00 PM and maintaining this highest level until 2:00 PM. This critical window indicates significant sun exposure, and it’s essential to take precautions. As the afternoon progresses, the index begins to taper off, dropping to 8 at 3:00 PM, then gradually falling to 1 by 7:00 PM. This data highlights the importance of being sun-smart during the peak hours to minimize UV exposure risks.

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	9	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Eureka

Throughout the year, the UV Index experiences significant fluctuations, impacting the level of sun exposure risk for individuals. High-risk months include March through September, where the UV Index reaches high to extreme levels, with the highest recorded in June at 11. During these peak months, the recommended burn time decreases to as little as 10 to 15 minutes, indicating a need for heightened precautions. Visitors and residents are strongly advised to protect their skin by using sunscreen, wearing protective clothing, and seeking shade during the peak sunlight hours, especially from April to September, to minimize the risk of harmful UV exposure. Conversely, in the winter months (December to February), the UV levels are more moderate, allowing for safer outdoor activities with longer burn times of 30 to 45 minutes.

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
Eureka	3	4	7	8	10	11	10	10	8	6	4	2
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5