UV Index in Butte, United States

Last updated: August 1, 2025

Understanding the UV Index is crucial for residents of Butte, United States, where sun exposure can lead to skin damage and health risks. Being aware of UV levels helps in preventing sunburn and maintaining long-term skin health, especially in a climate that features distinct seasons with varying sun intensity. With maximum UV Index readings reaching 10 during midday hours, the potential for harm increases significantly. Thus, staying informed about UV risks is essential for enjoying outdoor activities safely while protecting your skin from the sun's harmful rays.

Hourly UV Index in Butte

The UV Index is a dynamic measure of solar intensity throughout the day, peaking dramatically at 12:00 PM with a notable 9, reaching its zenith at 1:00 PM and 2:00 PM with a maximum value of 10. During this period, it's essential to protect your skin from harmful UV rays. Early morning hours remain quite low, peaking at just 1 by 08:00 AM, while by 10:00 AM the index climbs to 5. As the sun continues to rise, it climbs swiftly to 7 by 11:00 AM, making midday the crucial time for sunscreen and shade. As the afternoon wanes, the UV Index gradually decreases, falling back to 5 by 5:00 PM, and finally settling at 1 by 7:00 PM, signaling a safe return to outdoor activities. Stay vigilant and enjoy the sunshine safely!

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.
TimeUVICategoryTime to Burn
07:001low45 min
08:001low45 min
09:002low45 min
10:004moderate30 min
11:006high25 min
12:008very high15 min
13:009very high15 min
14:0010very high15 min
15:008very high15 min
16:006high25 min
17:004moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Butte

Throughout the year, the UV Index exhibits notable seasonal fluctuations, peaking during the summer months. From January to April, the index gradually rises from 3 to 8, indicating a shift from moderate to very high risk. The risk of harm significantly increases in May and reaches its zenith in June with an extreme index of 11. High-risk months include March (UV Index 6) and April (UV Index 8), transitioning to very high risks from May through September when the index remains above 8. During these peak months, particularly in June, visitors and residents are strongly advised to take precautions: seek shade, wear protective clothing, and apply sunscreen regularly to mitigate skin damage. As the year progresses towards October and November, the UV Index decreases, returning to moderate levels by December, where exposure risks are lower and burn time increases to 45 minutes. This seasonal insight highlights the importance of adjusting sun safety practices throughout the year.

Monthly Maximum UV Index for Butte, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Butte. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec356891110108532
Data source: Statistical UV Index data for Butte, 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 Butte UV Index with Other United States Cities

The table above highlights how UV exposure in Butte 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.
Butte's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Butte356891110108532
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Los Angeles UVI46891011111010754
Houston UVI589111112121110975