UV Index in Alterosa, Brazil

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in Alterosa, Brazil, where the subtropical Cwa climate brings about varying levels of sun exposure. Being aware of UV levels can significantly aid in sunburn prevention and maintain overall skin health, as higher indices mean a greater risk of harm from ultraviolet radiation. During peak hours, particularly between 11:00 AM and 1:00 PM, the UV Index can reach up to 7, indicating a level of risk that warrants protective measures. By learning how to read the UV Index, you can enjoy the beautiful sun-drenched days in Alterosa while keeping your skin safe and healthy.

Hourly UV Index in Alterosa

At dawn, the UV Index starts off low, with a maximum of 1 at 07:00 and 08:00. As the sun rises higher, it reaches 3 by 09:00, before climbing to a peak of 7 at 12:00. This midday intensity signifies a need for sun protection, especially during the height of the day when UV exposure is most potent. The index begins to decline in the afternoon, dropping to 5 at 14:00 and settling back to 1 by 17:00. By 18:00 and into the evening, the UV Index sharply drops to 0, marking a safe time to enjoy outdoor activities without the risk of sunburn. Stay sun-safe!

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	5	moderate	30 min
11:00	6	high	25 min
12:00	7	high	25 min
13:00	6	high	25 min
14:00	5	moderate	30 min
15:00	3	moderate	30 min
16:00	1	low	45 min
17:00	1	low	45 min
18:00	0	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Alterosa

The UV Index data reveals pronounced seasonal fluctuations in sun exposure risk, with extreme levels persisting from January to April and then resurging in September through November. The highest risk months are notably January, February, March, and December, all registering an extreme UV Index of 16, which corresponds to a rapid burn time of just 10 minutes. Visitors and residents are strongly advised to take precautions during these months—such as wearing sunscreen, protective clothing, and seeking shade—to mitigate the risk of skin damage. From May to August, while the UV Index drops slightly, it remains in the high to very high category; therefore, vigilance is essential throughout the year, especially during outdoor activities.

Monthly Maximum UV Index for Alterosa, Brazil

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

The table above highlights how UV exposure in Alterosa compares to other major locations across Brazil. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.

Alterosa's solar exposure compared to other cities in Brazil. Generated using Copernicus Atmosphere Monitoring Service information.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Rio de Janeiro UVI	15	14	13	10	7	6	7	9	11	12	13	15
Sao Paulo UVI	16	15	12	11	8	6	7	9	11	13	14	15
Alterosa	16	16	14	12	9	7	8	10	12	14	14	16
Belo Horizonte UVI	17	16	14	12	9	7	8	10	12	13	14	16
Salvador UVI	14	14	14	13	10	9	9	12	12	15	15	14
Fortaleza UVI	14	14	15	15	13	11	11	12	13	13	13	13