Last updated: June 2, 2025
Understanding the UV Index in Biržai, Lithuania is crucial for ensuring skin health and preventing sunburn. As sunny summer days can quickly raise UV levels—peaking at 7 around midday—being aware of these fluctuations can help residents and visitors take necessary precautions. Given Biržai's Dfb climate, which features cool summers and moderate sunlight, the risk of UV exposure during peak hours can be significant. Staying informed about UV levels not only protects your skin but also enhances outdoor enjoyment in this picturesque region.
The UV Index starts off mildly low at 1 at 7:00 AM, gradually climbing throughout the morning. By 10:00 AM, it reaches a moderate 4, with significant exposure risk beginning around 11:00 AM as it spikes to 6. The highest levels occur from 12:00 PM to 2:00 PM, maintaining a strong 7 during peak hours—perfect for sun enthusiasts but a cause for caution. As the afternoon progresses, the index gradually declines, dropping to 4 by 5:00 PM and further down to 1 by 7:00 PM. This reveals a clear pattern: the midday sun offers the greatest intensity, so sun safety measures are crucial during those hours.
| 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 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, there are significant variations in the UV Index that indicate changing risks associated with sun exposure. January and February exhibit low levels, with a UV Index of 1 and 2, allowing for a safer burn time of 45 minutes. As we move into March and April, the UV Index rises to 3 and 5 respectively, transitioning to a moderate risk where the burn time decreases to 30 minutes. The peak risk months occur from May to August, where the UV Index reaches high levels of 6 and 7, corresponding to a burn time of just 25 minutes. September and October see a return to moderate levels, with the UV Index falling to 4 and 3, extending burn times back to 30 minutes. November and December once again present low UV conditions, with burn times increasing to 45 minutes. Visitors and residents should exercise increased caution and utilize sun protection during the high-risk months of May through August, ensuring adequate sunscreen application, protective clothing, and seeking shade when necessary.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Birzai | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 6 | 4 | 3 | 2 | 1 |
| Siauliai UVI | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 |
| Panevezys UVI | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 |
| Klaipeda UVI | 1 | 2 | 3 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 |
| Kaunas UVI | 1 | 2 | 4 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 |
| Vilnius UVI | 1 | 2 | 4 | 5 | 6 | 7 | 7 | 6 | 5 | 3 | 2 | 1 |