UV Index in West Yellowstone, United States

Last updated: July 2, 2025

In West Yellowstone, understanding the UV Index is essential for protecting your skin and overall health. The UV Index measures the strength of ultraviolet radiation from the sun, which can lead to sunburn and increase the risk of skin ailments, making awareness particularly important in this scenic area. Nestled in a Dfc climate zone, West Yellowstone experiences varied weather conditions, but during the summer, UV levels can peak significantly—reaching a critical level of 11 around midday. By being mindful of the UV Index, residents and visitors can take proactive steps to ensure their enjoyment of the great outdoors while safeguarding their skin from harmful rays.

Hourly UV Index in West Yellowstone

As the day progresses, the UV Index rises dramatically, peaking at a striking 11 between 1:00 PM and 2:00 PM. Starting from a modest 1 at 7:00 AM, the index steadily climbs, reaching 2 by 8:00 AM and hitting 5 by 10:00 AM. The real intensity kicks in around 11:00 AM, recording an 8, before soaring to its maximum of 10 at noon. After the midday peak, the index begins to decline but still remains significant with a 10 at 3:00 PM and dips to 7 by 4:00 PM. As the sun sets, the UV radiation decreases, trailing off to a 3 at 6:00 PM and finally settling back to 1 by 7:00 PM, marking a gradual end to the day’s sun exposure. Stay protected!

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
08:002low45 min
09:003moderate30 min
10:005moderate30 min
11:008very high15 min
12:0010very high15 min
13:0011extreme10 min
14:0011extreme10 min
15:0010very high15 min
16:007high25 min
17:005moderate30 min
18:003moderate30 min
19:001low45 min

Monthly UV Index Trends in West Yellowstone

The UV Index exhibits significant seasonal variation, peaking during the summer months of May through August, where it reaches extreme levels of 11. Specifically, April sees a rise to a very high index of 9, and as summer approaches, it steadily climbs, with the lowest burn time for those months decreasing to just 10 minutes. In contrast, January and February have a moderate index of 3 and 5 respectively, allowing for safe sun exposure for up to 30 minutes. Visitors and residents should exercise heightened caution during the high-risk months of March to August, particularly from May to July when the sun's intensity is extreme. It’s advisable to wear protective clothing, apply sunscreen liberally, and seek shade during peak hours to minimize the risk of sunburn and long-term skin damage. As we move into the fall and winter months, the UV Index decreases, allowing for safer exposure, particularly in November and December when the burn time is significantly longer.

Monthly Maximum UV Index for West Yellowstone, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in West Yellowstone. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec3579111111109642
Data source: Statistical UV Index data for West Yellowstone, 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 West Yellowstone UV Index with Other United States Cities

The table above highlights how UV exposure in West Yellowstone 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.
West Yellowstone's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
West Yellowstone3579111111109642
Los Angeles UVI46891011111010754
Houston UVI589111112121110975