UV Index in Dayton, United States

Last updated: June 2, 2025

In Dayton, United States, understanding the UV Index is crucial for maintaining healthy skin and preventing sunburns under the sun's intense rays. With a Dfa climate that experiences significant UV exposure, especially between the hours of 10 AM and 3 PM, awareness of daily UV levels can help residents protect themselves from harmful effects. The peak UV Index in Dayton can reach as high as 11, making it vital for locals to stay informed and take precautionary measures, such as wearing sunscreen and protective clothing, to enjoy the outdoors safely while safeguarding their skin health.

Hourly UV Index in Dayton

As the day unfolds, the UV Index rises steadily, peaking at 11 around 1 PM—a clear signal for sun protection. Starting from a low of just 1 at 7 AM, it escalates through the morning, hitting 8 by 11 AM. At 12 PM, the intensity reaches a significant 10, before slightly diminishing to 9 at 3 PM and tapering off rapidly in the afternoon. As the sun begins to set, the UV levels drop to 4 by 5 PM, finally settling back to 1 by 7 PM. With this clear UV trajectory, staying cautious during the peak hours, especially from 11 AM to 2 PM, is essential for skin safety. Don your sunscreen and enjoy the sun responsibly!

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	2	low	45 min
09:00	4	moderate	30 min
10:00	6	high	25 min
11:00	8	very high	15 min
12:00	10	very high	15 min
13:00	11	extreme	10 min
14:00	10	very high	15 min
15:00	9	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Dayton

Throughout the year, the UV Index undergoes notable seasonal changes, with the highest levels typically occurring in the summer months. April signals the onset of increased UV radiation, peaking in June with an extreme UV Index of 11 and a burn time of just 10 minutes. The high-risk months for sun exposure are April to September, when values range from 8 to 11, indicating very high to extreme levels. Residents and visitors should be especially cautious during this period, taking proactive measures such as wearing sunscreen, sunglasses, and protective clothing, and seeking shade during peak sunlight hours. In contrast, the winter months of December and January present a moderate UV risk, but vigilance remains essential, as skin can still be affected by UV rays even when temperatures are cooler.

Monthly Maximum UV Index for Dayton, United States

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

The table above highlights how UV exposure in Dayton 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.

Dayton'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
Dayton	3	5	5	8	9	11	10	9	8	6	3	3
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