UV Index in Caldwell, United States

Last updated: July 2, 2025

In Caldwell, United States, understanding the UV Index is crucial for protecting your skin from harmful ultraviolet rays. As the sun's intensity peaks during the day, particularly between 11 AM and 3 PM, being aware of UV levels can help you prevent sunburns and maintain long-term skin health. With Caldwell's semi-arid climate (BSk), residents and visitors face unique exposure risks, especially during warmer months. Stay informed and safeguard your skin by tracking the UV Index regularly!

Hourly UV Index in Caldwell

The UV Index throughout the day reveals a striking increase in sun intensity as the morning transitions into afternoon. Starting off at a mild 1 at 07:00 and 08:00, it gradually escalates to 2 by 09:00. The real surge occurs between 10:00 and 13:00, where values leap to a peak of 10 at 13:00, indicating a significant risk of harm from unprotected sun exposure. As the afternoon wanes, the index dips from 10 at 14:00 to 8 by 16:00, before finally settling back to a more manageable 3 by 18:00 and 2 by 19:00. Be sure to take precautions when the sun's rays are at their strongest!

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	2	low	45 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	9	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	2	low	45 min

Monthly UV Index Trends in Caldwell

Throughout the year, the UV Index shows significant variability, peaking during the summer months. High-risk months, characterized by a UV index of 8 or above, include April through September, with the highest levels occurring in June (UV Index 11) and May (UV Index 10), both categorized as extreme and very high, respectively. During these months, the recommended burn time decreases significantly, with only 10-15 minutes of unprotected exposure being safe. Consequently, it is crucial for visitors and residents to take precautionary measures in these months—wearing sunscreen, protective clothing, and seeking shade during peak hours can help mitigate the risks of overexposure. In contrast, the winter months of January, February, and December feature moderate to low UV levels, with longer safe exposure times of 30-45 minutes. However, even during these cooler months, it’s advised to remain vigilant about UV protection, particularly on sunny days.

Monthly Maximum UV Index for Caldwell, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Caldwell. 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 Caldwell, 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 Caldwell UV Index with Other United States Cities

The table above highlights how UV exposure in Caldwell 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.

Caldwell'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
Caldwell	3	4	6	8	10	11	10	9	8	5	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