UV Index in Cary, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents of Cary, United States, where the warm Cfa climate often leads to higher sun exposure. With peak UV levels reaching as high as 11 during midday, awareness of these fluctuations is essential for preventing sunburn and maintaining long-term skin health. As you enjoy outdoor activities in Cary, being mindful of UV levels can help you take protective measures against harmful radiation, ensuring a fun and safe experience in the sun.

Hourly UV Index in Cary

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.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	3	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	8	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 Cary

Throughout the year, UV exposure varies significantly, peaking during the late spring and summer months. High-risk months for UV exposure include April through August, where the UV Index reaches very high to extreme levels, particularly in May, June, and July, with a dangerous UV Index of 11 and a burn time as short as 10 minutes. As such, it is crucial for visitors and residents to take precautions during these months, including wearing sunscreen, protective clothing, and sunglasses, while seeking shade during peak sun hours. Conversely, the winter months show a decrease in UV risk, with January and December marked as having moderate exposure, allowing for longer burn times of 30 minutes. By staying informed and taking necessary precautions, individuals can enjoy outdoor activities while minimizing their risk of UV-related harm.

Monthly Maximum UV Index for Cary, United States

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

The table above highlights how UV exposure in Cary 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.

Cary'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
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Cary	4	6	8	10	11	11	11	10	9	8	5	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5