Last updated: May 3, 2025
Understanding the UV Index is essential for residents and visitors of Tres Arroyos, Argentina, as it plays a critical role in safeguarding skin health and preventing sunburn. With the city's temperate oceanic climate, the UV levels can fluctuate significantly throughout the day, peaking at 4 between 12:00 PM and 2:00 PM. Awareness of these levels helps you take necessary precautions during the sunniest hours and enjoy the beautiful outdoors while minimizing the risks associated with high UV exposure. By monitoring the UV Index, you can better protect yourself and your loved ones from harmful effects of the sun, ensuring a safer and healthier experience in this picturesque coastal area.
At dawn, the UV Index remains nonexistent until 8:00 AM, when it registers a low 1, gradually climbing as the day unfolds. By 10:00 AM, it reaches 2, and as the sun reaches its zenith at 12:00 PM, the index peaks at a moderate 4. This peak is maintained until 2:00 PM, where the sun’s intensity persists, before gradually tapering off in the afternoon. At 3:00 PM, the UV Index drops back down to 3, continuing its decline to 1 by 5:00 PM, and ultimately settling back to 0 by 6:00 PM. As evening approaches, the UV radiation fades, highlighting the importance of sun protection during those midday hours when it’s most potent.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 2 | low | 45 min |
| 11:00 | 3 | moderate | 30 min |
| 12:00 | 4 | moderate | 30 min |
| 13:00 | 4 | moderate | 30 min |
| 14:00 | 4 | moderate | 30 min |
| 15:00 | 3 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index experiences significant seasonal fluctuations, with January and December leading as the months with the highest risk, both at UV Index 14 in the extreme exposure category, where you can burn in just 10 minutes. Notably, February and November also pose a high risk with UV Index 12. As spring approaches, March sees a reduction to UV Index 10 (very high), while April drops to UV Index 7 (high), allowing for longer safe exposure times of 25 minutes. The summer months of May, June, and July present moderate risks (UV Index 4 to 3) with burn times extending to 30 minutes. However, this risk rises again in September and October before returning to extreme levels in late fall and winter. Visitors and residents should take precautions, especially during the high-risk months of January, February, October, and November, by wearing protective clothing, applying sunscreen, and seeking shade during peak sun hours to ensure skin safety.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tres Arroyos | 14 | 12 | 10 | 7 | 4 | 3 | 3 | 5 | 7 | 10 | 12 | 14 |
| Buenos Aires UVI | 14 | 13 | 11 | 7 | 5 | 4 | 4 | 6 | 8 | 10 | 13 | 14 |
| Rosario UVI | 14 | 13 | 11 | 8 | 5 | 4 | 4 | 6 | 8 | 11 | 13 | 14 |
| Mendoza UVI | 15 | 14 | 12 | 8 | 6 | 4 | 5 | 6 | 9 | 12 | 14 | 15 |
| Cordoba UVI | 15 | 13 | 12 | 9 | 6 | 4 | 5 | 7 | 9 | 12 | 14 | 15 |
| San Miguel de Tucuman UVI | 15 | 14 | 13 | 10 | 7 | 5 | 6 | 7 | 10 | 13 | 15 | 15 |