UV Index in Williams, United States

Last updated: May 3, 2025

In Williams, United States, staying informed about the UV Index is crucial for protecting your skin and overall health. As a town nestled in a Csb climate zone, Williams experiences varying UV levels throughout the day, peaking at a dangerous 12 during midday hours. Understanding these UV levels is essential for sunburn prevention, reducing the risk of skin cancer, and maintaining skin health. With afternoon UV readings often hitting 11 to 12, it's vital to take proper precautions when enjoying the great outdoors. By being aware of the UV Index, you can safely soak up the sun while keeping your skin protected.

Hourly UV Index in Williams

As the sun rises, the UV Index begins its ascent, starting at a mild 1 at 07:00. By 08:00, it increases to a moderate 3, but the real surge comes just before noon. The index peaks at an intense 12 during the midday hours, specifically at 12:00, urging sun protection for those outdoors. Following this high, a gradual decrease occurs, with the values declining to 10 by 14:00, then tapering off to 7 at 15:00. As the day wanes, the UV intensity drops significantly, falling to 1 by 19:00, signifying a much safer period for sun exposure. This hourly UVI cycle illustrates a clear pattern: the importance of seeking shade and wearing sunscreen during the peak hours when the sun’s rays are the 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.
TimeUVICategoryTime to Burn
07:001low45 min
08:003moderate30 min
09:006high25 min
10:008very high15 min
11:0011extreme10 min
12:0012extreme10 min
13:0011extreme10 min
14:0010very high15 min
15:007high25 min
16:004moderate30 min
17:002low45 min
18:001low45 min
19:001low45 min

Monthly UV Index Trends in Williams

The UV Index varies significantly throughout the year, highlighting high-risk months during which sun exposure requires heightened caution. From February to August, the UV Index reaches levels between 8 and 12, indicating very high to extreme exposure categories, with burn times as short as 10 minutes. Notably, April through July presents the greatest risk, making it crucial for visitors and residents to protect their skin through the use of sunscreen, protective clothing, and shade during peak hours. September and October see a gradual decline (UV Index 10 and 8, respectively), but still demand caution. As winter approaches in November and December, the UV Index decreases to 6 and 4, transitioning into a high to moderate exposure category, with burn times increasing back to 25 and 30 minutes. It’s essential for everyone to remain aware of these seasonal changes to ensure their safety while enjoying outdoor activities.

Monthly Maximum UV Index for Williams, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Williams. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec489111212121110864
Data source: Statistical UV Index data for Williams, 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 Williams UV Index with Other United States Cities

The table above highlights how UV exposure in Williams 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.
Williams'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
Los Angeles UVI46891011111010754
Williams489111212121110864
Houston UVI589111112121110975