Last updated: June 2, 2025
In San Justo, Argentina, being aware of the UV Index is essential for protecting your skin against harmful ultraviolet radiation. Understanding UV levels is crucial not only for preventing sunburn but also for maintaining long-term skin health. With a Cfa climate characterized by warm summers and plenty of sunshine, San Justo experiences varying UV exposure throughout the day, peaking at a UV Index of 4 between 12 PM and 2 PM. Stay informed and take the necessary precautions to enjoy the sun safely while safeguarding your skin!
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 |
Throughout the year, UV exposure varies significantly, with high-risk months identified as January, February, March, October, November, and December, all experiencing an extreme UV Index of 14 or 13. The burn time during these months is notably short at just 10 minutes, indicating the need for heightened caution. Transitional months like April and September classify as very high with a UV Index of 9, allowing for 15 minutes before potential skin damage occurs. In contrast, the late spring and summer months (May to August) show high to moderate UV levels, allowing for longer exposure times up to 30 minutes in June and July. Visitors and residents are advised to adopt protective measures—such as applying sunscreen, wearing protective clothing, and seeking shade—especially during the extreme and very high months to mitigate the risk of sunburn and long-term skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 |
| San Justo | 14 | 13 | 12 | 9 | 6 | 4 | 5 | 6 | 9 | 11 | 14 | 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 |