UV Index in Sao Joao da Boa Vista, Brazil

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors of Sao Joao da Boa Vista, Brazil, where the climate is characterized by warm summers and moderate sunshine. As the sun rises higher in the sky, UV levels can fluctuate significantly, reaching a peak of 7 around noon—an indicator that sunburn and skin damage can occur within minutes without proper protection. By keeping an eye on the UV Index, you not only safeguard your skin health but also enjoy the beautiful outdoors safely. With typical exposure risks peaking between late morning and early afternoon, awareness of these levels can help you plan your activities wisely and prevent harmful effects from the sun’s rays.

Hourly UV Index in Sao Joao da Boa Vista

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.
TimeUVICategoryTime to Burn
07:001low45 min
08:001low45 min
09:003moderate30 min
10:005moderate30 min
11:006high25 min
12:007high25 min
13:006high25 min
14:005moderate30 min
15:003moderate30 min
16:001low45 min
17:001low45 min
18:000low45 min
19:000low45 min

Monthly UV Index Trends in Sao Joao da Boa Vista

The UV Index shows significant seasonal variation, with the highest readings occurring from January to April, where the index reaches an extreme 16. These months pose a high risk for sunburn, with a critical 10-minute burn time. After April, the index slightly decreases, but remains very high in May (8) and July (8), and high in June (7). As summer transitions into fall, the UV Index fluctuates but remains concerning, especially in September (12) and October (14), both categorized as extreme, again allowing only a short 10-minute exposure without protection. The end of the year is marked by high indices once more, peaking in December at 16. Visitors and residents are strongly advised to take protective measures against UV exposure, particularly during these high-risk months to minimize the risk of sunburn and long-term skin damage.

Monthly Maximum UV Index for Sao Joao da Boa Vista, Brazil

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Sao Joao da Boa Vista. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec161613118781012141516
Data source: Statistical UV Index data for Sao Joao da Boa Vista, 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 Sao Joao da Boa Vista UV Index with Other Brazil Cities

The table above highlights how UV exposure in Sao Joao da Boa Vista 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.
Sao Joao da Boa Vista's solar exposure compared to other cities in Brazil. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Rio de Janeiro UVI15141310767911121315
Sao Paulo UVI16151211867911131415
Sao Joao da Boa Vista161613118781012141516
Belo Horizonte UVI171614129781012131416
Salvador UVI1414141310991212151514
Fortaleza UVI141415151311111213131313