Last updated: May 3, 2025
Understanding the UV Index in Brno, Czech Republic is essential for protecting your skin and overall health. As the sun's rays become more intense throughout the day, being aware of UV levels can help prevent painful sunburn and long-term skin damage. Brno's temperate climate (Cfb) means that while summer days can bring high UV exposure, early mornings and late afternoons typically offer more moderate levels. Whether you're enjoying outdoor activities or simply soaking up some sun, keeping an eye on the UV Index is key to ensuring a safe and enjoyable experience in this beautiful city.
The UV Index throughout the day exhibits a clear peak around midday. Starting from a low of 1 at 07:00, the intensity gradually escalates, hitting 3 by 09:00 and reaching its zenith of 8 at 13:00. As the sun climbs higher, the UV Index stands at 7 at 12:00, indicating a strong potential for skin damage without protection. The intensity starts to dip after 14:00, descending to 6 by 15:00, and further declining to 1 by 18:00, where it remains until sunset. This hourly data underscores the importance of sun protection during the peak hours of 11:00 to 14:00, ensuring safety while enjoying outdoor activities!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | 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 | 8 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index exhibits notable seasonal variations that are crucial for visitor and resident safety. From January to February, the UV levels are relatively low to moderate, allowing for longer exposure times of up to 45 minutes in January and 30 minutes in February. However, as spring arrives in March with an increase to a UV Index of 5, residents should start to exercise caution. The months of April to July present the highest risk, marked by very high UV levels (8) and reduced burn times of just 15 minutes. As summer transitions to fall, August and September maintain high UV levels (6-7), requiring vigilance, especially as burn times decrease to 25 minutes. By October, the risks diminish to moderate levels, while November and December revert back to low, allowing for longer exposure without significant harm. Visitors and residents are advised to take preventive measures during high-risk months, particularly from April through July, by wearing appropriate sun protection, including sunscreen, hats, and UV-blocking clothing, to minimize the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prague UVI | 2 | 3 | 4 | 5 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Ostrava UVI | 2 | 2 | 4 | 6 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Olomouc UVI | 2 | 3 | 4 | 6 | 7 | 8 | 8 | 7 | 6 | 4 | 2 | 2 |
| Pilsen UVI | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 7 | 6 | 4 | 2 | 1 |
| Brno | 2 | 3 | 5 | 6 | 8 | 8 | 8 | 7 | 6 | 4 | 2 | 2 |