UV Index in Windsor, United States

Last updated: August 1, 2025

In Windsor, United States, staying informed about the UV Index is crucial for protecting your skin from harmful ultraviolet rays. Understanding UV levels helps in preventing sunburns and maintaining long-term skin health, especially under the radiant sun typical of Windsor's Cfa climate. With peak UV levels reaching as high as 11 from noon to early afternoon, it's essential to take precautions during these hours. By being aware of the UV Index, you can enjoy the outdoors while safeguarding your skin against potential damage.

Hourly UV Index in Windsor

As the sun rises, the UV Index starts off gently at 1 by 7:00 AM, gradually climbing as the day progresses. By 10:00 AM, it reaches 6, signaling a notable increase in solar radiation. The intensity peaks at 12:00 PM with a striking 10 and continues to soar to a maximum of 11 at 1:00 PM, marking the hour of greatest exposure. As the afternoon unfolds, the index begins to taper off—dropping to 10 at 2:00 PM and 8 by 3:00 PM. By late afternoon, the UV Index gracefully descends to 4 at 5:00 PM, settling back to 2 by 6:00 PM and finally returning to a gentle 1 by 7:00 PM. This highlights the importance of sun protection during mid-day when UV rays are at their most intense.

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
09:003moderate30 min
10:005moderate30 min
11:007high25 min
12:009very high15 min
13:0010very high15 min
14:009very high15 min
15:008very high15 min
16:005moderate30 min
17:003moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Windsor

As we transition through the year, UV Index levels exhibit significant seasonal changes that are crucial for visitors and residents to understand. The months of May and July, with an extreme UV Index of 11, are recognized as high-risk months, where the burn time is notably short at just 10 minutes. Following closely are March, April, June, August, September, and October, all categorized as very high risk, requiring caution with burn times ranging from 15 minutes. In contrast, January, November, and December show moderate UV Index levels of 4, 5, and 3 respectively, with burn times extending to 30 minutes. Visitors and residents should take extra precautions during high-risk months by applying sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of UV-related health issues.

Monthly Maximum UV Index for Windsor, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Windsor. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec4689111011109753
Data source: Statistical UV Index data for Windsor, 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 Windsor UV Index with Other United States Cities

The table above highlights how UV exposure in Windsor 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.
Windsor'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
Windsor4689111011109853
Los Angeles UVI46891011111010754
Houston UVI589111112121110975