Last updated: August 1, 2025
Understanding the UV Index is crucial for anyone enjoying the beauty of La Fortuna, Costa Rica, where the breathtaking scenery is matched only by the sun’s intensity. With a tropical climate, especially during peak hours, UV levels can reach dangerously high numbers, peaking at 14 around noon. This knowledge is vital for sunburn prevention and maintaining healthy skin, as unprotected exposure can lead to serious long-term consequences. Being aware of the UV Index not only helps you plan your outdoor activities safely but also ensures you enjoy La Fortuna's natural wonders without compromising your skin's health. Whether you’re hiking through lush rainforests or basking in the sun, knowing how to protect yourself is essential in this vibrant destination.
As the sun rises, the UV Index starts off low at 2 at 07:00, perfect for a morning stroll. By 08:00, it climbs to 4, indicating a bit more sun exposure. The heat of the day peaks between 10:00 and 12:00, with the UV Index soaring to a striking 14 at 12:00. This is the time to take precautions! As the afternoon wanes, the index gradually declines, dropping to 9 by 14:00 and falling further to 5 at 15:00. By the evening, it’s safe to venture out again, with levels decreasing to a mere 0 by 18:00 and remaining so through the night. Stay sun-smart and enjoy the beautiful day while knowing when to seek shade!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 8 | very high | 15 min |
| 10:00 | 11 | extreme | 10 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 5 | 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, the UV Index remains notably high, with the most intense levels occurring from January to April, peaking at an index of 15 in April. These months, particularly February and March, represent the highest risk for sunburn, with a burn time of only 10 minutes. Visitors and residents are advised to exercise extreme caution during these months, utilizing protective measures such as sunscreen, hats, and protective clothing to mitigate the risk of UV exposure. Even in the latter months, the UV Index remains elevated, particularly from October to December, where the exposure category is still classified as very high. It’s essential for everyone to stay informed and protect their skin year-round, especially during these high-risk months.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Limon UVI | 12 | 13 | 14 | 15 | 14 | 13 | 13 | 13 | 13 | 14 | 11 | 10 |
| Liberia UVI | 11 | 13 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 11 | 10 |
| La Fortuna | 11 | 13 | 14 | 15 | 14 | 14 | 14 | 13 | 13 | 14 | 11 | 10 |
| Alajuela UVI | 12 | 13 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 14 | 12 | 10 |
| San Jose UVI | 12 | 14 | 15 | 16 | 14 | 14 | 14 | 14 | 14 | 15 | 12 | 11 |
| Paraiso UVI | 13 | 14 | 16 | 16 | 15 | 15 | 15 | 14 | 14 | 15 | 12 | 11 |