UV Index in Petersburg, United States

Last updated: July 2, 2025

In Petersburg, United States, being aware of the UV Index is crucial for safeguarding your skin and overall health. Understanding UV levels helps prevent sunburn and long-term skin damage, particularly during the peak hours of sunlight when the risk escalates. With a Dfa climate that brings warm summers, Petersburg experiences higher UV exposure, especially between 11 AM and 3 PM when the index can spike to 10. Staying informed about daily UV levels empowers residents to take appropriate precautions, ensuring enjoyable outdoor activities while protecting their skin from harmful rays.

Hourly UV Index in Petersburg

The UV Index throughout the day presents a dynamic portrait of solar intensity. Early morning hours from 7:00 to 8:00 maintain a gentle glow with a consistent level of 1, suggesting low sun exposure risk. As the day progresses, a noticeable shift occurs; by 9:00, the index climbs to 3, marking the onset of stronger rays. The peak is reached at 1:00 PM and 2:00 PM, where the UV Index soars to an intense 10, indicating very high exposure risk, making sun protection vital. Post-peak, from 3:00 PM onward, the index gradually declines, settling to 5 by 5:00 PM and dwindling further to low levels of 1 by 7:00 PM. This data underscores the importance of being sun-smart during those midday hours when UV radiation is 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.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	1	low	45 min
09:00	3	moderate	30 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	9	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Petersburg

The UV Index experiences significant fluctuations throughout the year, with high-risk months primarily occurring from April to September. During this period, UV levels reach their peak, particularly in June and July, where the index consistently measures 10, indicating a very high exposure category and a burn time of just 15 minutes. In contrast, the UV Index is at its lowest in January and December (index of 2), categorized as low, allowing for a safer exposure time of 45 minutes. Visitors and residents are advised to take appropriate precautions during high-risk months, including wearing protective clothing, using sunscreen, and seeking shade, especially during the midday hours when the sun's rays are the strongest.

Monthly Maximum UV Index for Petersburg, United States

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

The table above highlights how UV exposure in Petersburg 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.

Petersburg'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
Petersburg	2	5	5	9	9	10	10	9	8	6	4	2
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
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5