UV Index in Eureka, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents and visitors of Eureka, United States, especially given the area's unique climate in the Dfa zone. With UV levels reaching a peak of 9 during midday hours, awareness of these fluctuations can make a significant difference in preventing sunburn and promoting long-term skin health. By staying informed about the UV Index, you can effectively protect yourself against the harmful effects of solar radiation and enjoy the beautiful, sunny days Eureka has to offer—while keeping your skin safe!

Hourly UV Index in Eureka

At sunrise, the UV Index starts gently with values of 1 at 07:00 and 08:00, presenting a safe environment for early risers. As the day progresses, the intensity climbs sharply, reaching 4 by 10:00 and peaking at a substantial 9 between 13:00 and 15:00. This midday sunshine demands caution, as UV exposure dramatically increases; thus, wearing protective clothing and sunscreen is highly advised. By 16:00, the index begins to decrease to 7, followed by a steady decline to 3 at 18:00. As twilight approaches, UV risks diminish to 2 by 19:00, allowing for a gentle end to the day's sun exposure.

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	1	low	45 min
09:00	3	moderate	30 min
10:00	4	moderate	30 min
11:00	6	high	25 min
12:00	8	very high	15 min
13:00	9	very high	15 min
14:00	9	very high	15 min
15:00	9	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	2	low	45 min

Monthly UV Index Trends in Eureka

The UV Index experiences notable seasonal fluctuations, with low exposure in January and December (UV Index 2) and moderate to high exposure from February through October. The high-risk months for UV exposure are May through September, where the UV Index peaks at 10 in June and remains above 8 throughout the summer. During these months, the recommended burn time significantly decreases to just 15 minutes, indicating a pressing need for protective measures. Accordingly, visitors and residents are advised to take precautions, such as wearing sunscreen, protective clothing, and seeking shade, especially during peak UV hours from 10 AM to 4 PM. As the season transitions to November and December, UV risk diminishes, allowing for safer outdoor activities without the same level of concern.

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
Eureka	2	5	5	7	9	10	9	9	8	5	3	2
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
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5