Last updated: July 2, 2025
Understanding the UV Index in Hérin, France, is crucial for protecting your skin and overall health. With the potential for sunburn and long-term skin damage, being aware of UV levels allows residents and visitors to make informed decisions about sun exposure throughout the day. In this temperate maritime climate (Cfb), typical summer days can see UV Index readings reach as high as 8, particularly around midday, which indicates increased risk for harm without proper protection. Knowing when to seek shade or apply sunscreen can help you enjoy the sun safely while minimizing skin health risks.
The UV Index for the day reveals a steady rise in solar intensity, peaking dramatically at 8 between 1:00 PM and 2:00 PM. Starting off gently with a maximum of 1 in the early hours, the index gradually climbs to a moderate 4 by 10:00 AM. As the sun reaches its zenith, the index surges, hitting 5 at 11:00 AM and then escalating to 7 by noon. Be cautious during the peak hours, especially when the UV Index reaches its maximum of 8 at 1:00 PM and 2:00 PM, indicating a high risk of harm from unprotected sun exposure. After 3:00 PM, the index begins to decline, settling at 4 by 5:00 PM and tapering off to 2 by 7:00 PM, inviting a more relaxed evening under the sun. Stay protected during the peak hours to enjoy a safe and sunny day!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 5 | moderate | 30 min |
| 12:00 | 7 | high | 25 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 3 | moderate | 30 min |
| 19:00 | 2 | low | 45 min |
The seasonal UV changes throughout the year reveal notable fluctuations in sun exposure risk. January and February present the lowest UV Index values (2), classified as low exposure, with a burn time of 45 minutes. As spring approaches, March and April see an increase to moderate levels (4 and 5), shortening burn time to 30 minutes. The risk peaks during May through July, with high (7) to very high (8) UV Index levels, leading to significantly reduced burn times of just 15 to 25 minutes. August starts to decline slightly to a high level (7), while September and October return to moderate ratings. The year wraps up with November and December falling back to low UV levels (2 and 1), allowing for longer burn times once more. Visitors and residents should particularly be cautious from May through July, taking proactive measures such as wearing sunscreen, protective clothing, and seeking shade during peak sun hours to minimize the risk of UV-related harm.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Herin | 2 | 2 | 4 | 5 | 7 | 8 | 8 | 7 | 5 | 4 | 2 | 1 |
| Paris UVI | 2 | 3 | 5 | 6 | 8 | 9 | 8 | 8 | 6 | 4 | 2 | 1 |
| Lyon UVI | 2 | 3 | 5 | 6 | 8 | 10 | 9 | 8 | 6 | 5 | 3 | 2 |
| Nice UVI | 2 | 4 | 6 | 7 | 8 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Marseille UVI | 2 | 4 | 5 | 7 | 9 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Toulouse UVI | 2 | 4 | 6 | 7 | 9 | 10 | 10 | 9 | 7 | 5 | 3 | 2 |