Live UV forecast for 31 cities
Uruguay stretches from -34.9033° to -30.4043° latitude (Southern hemisphere), so UV conditions differ a lot from region to region. The clear-sky UV index reaches ≈ 8.4 in Artigas (peak in December), while in Santa Lucia the yearly maximum is only ≈ 8.2. As in the whole Southern hemisphere, the sun is strongest from November to February — opposite to Europe and North America.
| Zone | Cities | J | F | M | A | M | J | J | A | S | O | N | D | Peak |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subtropical | 31 | 8.2 | 7.8 | 6.9 | 5.6 | 4.5 | 3.8 | 4 | 5 | 6.2 | 7.3 | 7.9 | 8.3 | 8.3 |
Calculated clear-sky noon peaks at the average latitude of each zone. Real values vary with clouds, altitude and ozone.
Using Montevideo as a reference: the UV index reaches 6+ in January, February, March, September, October, November and December. In the sunniest zones (see table) SPF 30–50+ is needed almost year-round; in the mildest — only in late spring and summer.
The calculated clear-sky maximum is ≈ 8.4 — in Artigas around December. Values above this occur only near the equator and in high mountains.
Artigas (peak ≈ 8.4), followed by Rivera and Dolores. The mildest sun is in Santa Lucia (max ≈ 8.2).
In Montevideo and similar latitudes the UV reaches 6+ in January, February, March, September, October, November and December: use SPF 30–50+ on sunny days. Protection is advised from UV 3.
No — the local maximum is ≈ 8.4. UV 11+ occurs only near the equator, in deserts and high mountains.