Last updated: July 2, 2025
Understanding the UV Index is crucial for residents and visitors in Grimstad, Norway, where the temperate maritime climate provides ample opportunities for outdoor activities but also presents varying UV exposure risks. With UV levels peaking at 6 during midday hours, awareness is key to preventing sunburn and protecting skin health. Recognizing these levels can help you enjoy the beautiful coastal scenery while safeguarding yourself against harmful effects of UV radiation. Whether you're hiking, swimming, or simply soaking up the sun, being informed about the UV Index can make all the difference in preserving your skin's well-being.
The UV Index throughout the day showcases a dynamic rise and fall in solar intensity. Starting off gently at 1 by 7:00 AM, it gradually ascends to a moderate 3 by 9:00 AM. From 10:00 AM to 1:00 PM, the index peaks at a robust 6, indicating a need for sun protection during these hours. As the afternoon progresses, the UV Index stabilizes at 6 until 3:00 PM, before gently descending back down to 4 by 5:00 PM, and tapering off to 1 by 7:00 PM. This daily cycle highlights the importance of being sun-smart, especially during the midday hours when UV exposure is at its highest.
| 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 | 5 | moderate | 30 min |
| 12:00 | 6 | high | 25 min |
| 13:00 | 6 | high | 25 min |
| 14:00 | 6 | 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, UV exposure varies significantly, with notable seasonal changes impacting both residents and visitors. From January to February, the UV Index remains low (1-2), allowing for a burn time of 45 minutes, making skin protection less critical. March and April see a moderate rise (UV Index 3-4) with a reduced burn time of 30 minutes, suggesting that some protective measures are advisable during outdoor activities. The risk peaks in the high-risk months of May through August, where the UV Index reaches between 6 and 7, and burn time drops to just 25 minutes—strongly advising the use of sunscreen, protective clothing, and hats. As the year transitions into September with a moderate UV Index (4), and then back to low levels from October to December (1-2), residents should be reminded that vigilance is key during these warmer months to avoid skin damage while enjoying the outdoors.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Trondheim UVI | 1 | 1 | 2 | 4 | 5 | 6 | 6 | 5 | 3 | 2 | 1 | 1 |
| Bergen UVI | 1 | 1 | 3 | 4 | 5 | 7 | 6 | 5 | 4 | 2 | 1 | 1 |
| Oslo UVI | 1 | 2 | 3 | 4 | 5 | 7 | 7 | 5 | 4 | 2 | 1 | 1 |
| Drammen UVI | 1 | 2 | 3 | 4 | 5 | 7 | 7 | 5 | 4 | 2 | 1 | 1 |
| Stavanger UVI | 1 | 1 | 3 | 4 | 6 | 7 | 6 | 5 | 4 | 2 | 1 | 1 |
| Grimstad | 1 | 2 | 3 | 4 | 6 | 7 | 7 | 6 | 4 | 2 | 1 | 1 |