UV Index in Eureka, United States

Last updated: May 3, 2025

Understanding the UV Index is essential for residents of Eureka, United States, where sun exposure can vary significantly throughout the day. With peak UV levels reaching as high as 11 during midday hours, awareness of UV radiation is crucial for effective sunburn prevention and long-term skin health. Eureka's BSk climate means sunny days can be deceptive, leading to increased risks of skin damage if protective measures aren't taken. Stay informed and protect yourself from harmful UV rays by monitoring the UV Index regularly!

Hourly UV Index in Eureka

As the sun rises, the UV Index begins at a gentle 1 at 7:00 AM, but it quickly escalates as the day progresses. By 10:00 AM, the index reaches 7, signaling a significant increase in UV radiation. The peak occurs at 12:00 PM and 1:00 PM, when it hits a striking 11, indicating very high risk of harm from unprotected sun exposure. As the afternoon unfolds, the index gradually declines, settling at 8 by 3:00 PM, then tapering off to 1 again by 7:00 PM. It's clear that midday is the time for caution—make sure to protect your skin during those hours!

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	3	moderate	30 min
09:00	5	moderate	30 min
10:00	7	high	25 min
11:00	10	very high	15 min
12:00	11	extreme	10 min
13:00	11	extreme	10 min
14:00	10	very high	15 min
15:00	8	very high	15 min
16:00	5	moderate	30 min
17:00	3	moderate	30 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Eureka

Throughout the year, the UV Index experiences notable fluctuations, with high-risk months primarily falling between March and August. During this period, the UV Index peaks at 12 in June and July, categorizing the exposure as extreme, necessitating precautions such as seeking shade and wearing protective clothing, as the burn time drops to just 10 minutes. March and April also exhibit very high UV levels of 9, reducing safe exposure to 15 minutes. As summer fades into fall, UV levels gradually decline, easing the risk, but October still presents a high index of 7, requiring vigilance. For residents and visitors alike, it is crucial to monitor the UV Index and take appropriate protective measures, especially during the height of summer.

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	9	9	11	12	12	11	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5