Friends at the beach in the summer
Body & Soul
28.05.2026 Christin Müller 548

At what UV index should I stop going out in the sun?

Wouldn't it be nice to just enjoy the sun without having to worry about protection? The UV Index is here to help: a handy number that tells you just how intense the current sun's rays really are.

​​​​​​​Text: Patrizia Lehmkuhl, Edited by: Christin Müller 

Summary: Key Points at a Glance 

The UV Index is your free, daily-updated early warning system for sunburn, acute skin damage, and long-term risks such as skin cancer. You should consistently use sunscreen whenever the index reaches a value of 3 or higher. By knowing when protection is necessary, you can plan your outdoor activities wisely and avoid unnecessary risks. 

Read more in this article:

What is the UV index? 

UV stands for ultraviolet radiation. The UV Index (UVI) summarizes the intensity of UV radiation at a given location in an easy-to-understand number and indicates how quickly you are at risk of getting sunburned. The higher the number, the greater the risk of sunburn, skin aging, eye damage, and skin cancer. 

What is today's UV index?

Would you like to know what the daily UV index is in your area? The nationwide solar UV monitoring network measures the amount of UV radiation reaching the ground at over 40 locations across the country. You can find the latest measurement data on the BfS website.

What factors influence the UV index? 

Various factors determine the current UV index: 

  • Sun's altitude: The higher the sun is in the sky, the stronger the UV radiation.
  • Ozone and airborne particles: Higher levels of ozone and aerosols reduce radiation; lower levels result in higher readings.
  • Note: Water , sand, snow, or light-colored facades can increase the strain.
  • Cloud cover: Reduces UV radiation but does not provide complete protection—UV rays can still penetrate clouds.

Tip: You can find out the exact value by checking many weather services or using a UV index card. 

How do you use the UV index in practice? 

The UV index is not just an abstract number; it helps people take specific protective measures. The WHO has clearly defined this: 


Source: WHO, Graphic: pme Familienservice

Even brief exposure to the midday sun can otherwise lead to painful redness and blistering—and, over the long term, also increase the risk of skin cancer and eye damage.

Sunscreen SPF: What You Need to Know 

The sun protection factor (SPF) on sunscreen indicates how much longer you can extend your natural protection time after applying the product without getting sunburned. The Federal Office for Radiation Protection recommends: 

  • When the UV index reaches 3 or higher: Sun protection for everyone! 
  • Children: SPF 30 or higher 
  • Adults: SPF 15 or higher 

Even more important than choosing the right SPF is how you apply it: 

  • Amount: About 5–6 tablespoons for the whole body. 
  • Reapply sunscreen: Every 2 hours, as well as after swimming or drying off. 

Your skin type is key: Very fair skin can burn after just a few minutes. Remember: It’s important to apply sunscreen consistently and to supplement this with protective clothing and staying in the shade!

Which sunscreen is right for me?

Not sure which sunscreen is right for you or how to best protect your skin from the sun? In our in-depth article, you’ll learn what matters most when it comes to proper sun protection. 

 

Myths About the Sun and Sun Protection – Debunked 

“It’s cloudy, so I’m safe.” – Wrong. Clouds reduce UV radiation, but they don’t block it completely. 

“Tanned skin doesn’t need protection.” – False. Darker skin offers some additional natural protection, but not complete protection. 

“Sunscreen alone is enough.” – Wrong. The best approach is a combination of sunscreen, clothing, shade, and adjusting the amount of time spent outdoors. 

“Using sunscreen leads to vitamin D deficiency.” – False. There is no scientific evidence to support this claim. 

Practical tips for sun protection in your daily life 

  • Use UV information (from weather services, UV index charts) to adjust your daily plans—such as what to wear, how long to stay outside, and when to engage in outdoor activities. Handy tip: An UV index chart shows you the exact UV index value for your current location. 
  • When the UV index is high: Try to schedule outdoor activities outside of the hours between 11 a.m. and 3 p.m. 
  • Extra protection is necessary, especially in conditions with strong glare (water, sand, snow, bright surroundings, or in the mountains). 
  • Take special care to protect children—their skin is very sensitive. 

Bottom line: The UV index protects your skin 

The UV Index is your reliable guide for sunny days. Experts recommend consistent sun protection starting at a UVI of 3: apply plenty of sunscreen, reapply it regularly, seek shade, and keep a close eye on children.

Don't be fooled by myths: even clouds and pre-tanned skin don't give you a free pass. Use the UV index to plan your day, avoid the intense midday sun, and enjoy the summer worry-free. 

In short: By checking the UV index, you can protect yourself and others in a smart way and enjoy the sun without worry. 

FAQ: Frequently Asked Questions About the UV Index & Sun Protection 

At what UV index should I stop going out in the sun?

It doesn’t necessarily mean “no longer,” but once the UV index reaches 8 (very high), you should avoid direct sunlight, seek out shaded areas, and take extra precautions (high SPF, protective clothing, a sun hat, and sunglasses). Once the UV index reaches 3, you should consistently use sunscreen.

Do I need sunscreen when it's cloudy?

Yes. Clouds block some UV rays but do not provide complete protection. Even on cloudy days, UV radiation can still cause skin damage—sun protection is recommended, especially when the UV index is 3 or higher.

What does the sun protection factor (SPF) on sunscreen mean?

The SPF indicates how much longer you can stay in the sun after applying sunscreen without getting sunburned, compared to your natural protection time. For example, SPF 30 theoretically extends your natural protection time by a factor of 30.

What SPF ratings are recommended?

From UVI 3: Sunscreen for everyone. Recommended: SPF 30 or higher for children; SPF 15 or higher for adults. In cases of high intensity (UVI ≥6), experts recommend SPF 30–50+ depending on skin type and duration of exposure.

How much sunscreen should I apply?

Guideline: Approximately 2 mg/cm² of skin—which is equivalent to about 5–6 level tablespoons for the entire body. In practice: Apply generously; do not use just a few sparing dabs.

How often do I need to reapply the sunscreen?

At least every 2 hours, as well as immediately after swimming, heavy sweating, or drying off.

Is sunscreen alone enough?

No. The best protection comes from a combination of sunscreen, protective clothing (UV-protective clothing), shade, a sun hat, and sunglasses, as well as planning your schedule (avoiding the midday hours).

What is the difference between UVA and UVB?

In short: UVA rays penetrate deeper and accelerate skin aging; UVB rays cause sunburn and are a major factor in skin cancer risk. Both are harmful and should be minimized.

What special considerations apply to children and babies?

Babies (under 1 year old): Avoid direct sunlight; keep them in the shade and dress them in protective clothing. For children: Use SPF 30 or higher, reapply frequently, and take extra precautions between 11 a.m. and 3 p.m. and in reflective environments (water, sand, snow).

How can I use the UV index to help me plan my day?

Check the UV index in the morning or throughout the day (weather services, BfS/DWD). Plan activities for the morning or later in the day, and choose appropriate protective measures based on the UVI level (e.g., UVI 3–5 → SPF 30, shade; UVI 6–7 → SPF 30–50, short stays; UVI ≥8 → stay in the shade, protective clothing, high SPF).

Sources & Recommended Reading 




 

zero Which sunscreen is right for me?

Little girl with sunscreen on her face laughs
Parent & Child
28.05.2026 Sabrina Ludwig 9133

Which sunscreen is right for me?

No, it’s no fun having to put sunscreen on your kids before heading out into the sun—but protection is important. Even adults often underestimate how quickly UV rays can damage the skin. This guide provides a brief and practical overview of what to look for when choosing and applying sunscreen, so you and your family can enjoy the sun safely.

UVA and UVB Rays: Why Sun Protection Is Important

Even if you are a darker type and sunburn is rare or almost non-existent, you should protect your skin from the sun. To be more precise: from UV-A and UV-B rays.

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UV-B rays , in particular, can have dangerous consequences. They are primarily responsible for sunburn and can cause cancer in skin cells.

The skin can still "repair" itself after exposure to low doses of UV-B that damage the cells.

However, if you spend too much time in the sun, the skin cells can become so severely damaged that the body causes them to die off. If the skin can no longer keep up with the healing process, the damaged cells may mutate into cancer.

UV-A rays —which are more common in tanning beds—are less likely to cause sunburn, but they penetrate much deeper into the skin than UV-B rays. Deep within the skin, they destroy the elastic fibers and collagen that keep the skin firm. The result: wrinkles can form more quickly.

It is therefore important that the UVA label is also shown on the sun cream packaging. The stated sun protection factor (SPF) only refers to UVB radiation.

What is the UV index?

Before choosing a sunscreen, check the current UV index for your location. The UV index provides daily updates on the intensity of the sun’s rays—and helps you decide which SPF to use, what clothing to wear, and how long it’s safe to stay outside.

Read the related article to find out at what UV index you should take extra precautions.

What is the UV index, and why is it so important?​​​​​​​

Chemical vs. Mineral Sunscreens: Pros and Cons

There are two types of UV filters designed to protect the skin from the sun : chemical and mineral. ​​​​​​​

Chemical sunscreens

Most conventional sunscreens rely primarily on chemical UV filters.

Advantages: 

  • They are quickly absorbed into the outermost layer of the skin, where they provide UV protection and convert the radiation into harmless heat. 
  • They spread more easily on the skin and often feel lighter on the skin. 
  • They are often highly water- and sweat-resistant, making them ideal for sports or swimming. 

By penetrating the outermost layer of the skin, chemical UV filters provide protection right where UV rays first strike the skin. The filters absorb the sun’s rays and convert them into harmless heat. 

Disadvantages: 

  • May not be well tolerated by people with very sensitive skin or allergies. 
  • The environmental impact of some ingredients is viewed critically in some quarters. 

Which chemical sunscreens are safe?

There is now a whole range of chemical UV filters that provide well-tolerated protection against UV radiation. Nevertheless, these sun creams should be used with caution: As the substances penetrate the skin, they not only put a strain on the liver, but can also trigger allergies.

List of conventional chemical filters with low allergenic potential and no proven hormonal effects in studies:

List of chemical sunscreens without hormonal effects​​​​​​​

Mineral sunscreens

Mineral filters are made from natural white particles such as zinc oxide or titanium dioxide. All organic and natural sunscreens contain mineral filters.

Advantages: 

  • Form a protective film on the skin and reflect UV rays. 
  • They take effect immediately after application. 
  • They are particularly gentle on sensitive skin and suitable for children, as they barely penetrate the skin. 
  • They usually score points for their environmental friendliness. 

Disadvantages: 

  • They often leave a visible white film on the skin. 
  • They can sometimes be a little harder to spread and have a thicker consistency in some cases. 
  • Occasionally offer lower resistance to water and sweat.

These days, many sunscreens combine the benefits of both types. The key factors are your skin type and the specific purpose for which you’ll be using it.  

Even if it feels greasy and leaves a white cast, mineral sunscreens are often a better choice for sensitive skin and children. For sports or swimming, waterproof products—including chemical ones—are a good option.

Nanoparticles in Mineral Sunscreens: A Brief Explanation

But not everyone is a fan of mineral sunscreens. Since the small particles leave a white film on the skin and the texture is often very thick, many manufacturers of mineral sunscreens use nano-sized mineral particles. These are tiny and feel more fluid and comfortable when applied to the skin—they don’t leave as noticeable a white cast.

However, there is debate as to whether these tiny particles can penetrate the skin and thus endanger health. However, there is a lack of comprehensive studies to prove this. As long as there is no unanimous scientific opinion, it is best to use mineral sun creams that do not contain nanoparticles. All nano-sized particles must be labeled with the word "nano" in the ingredients (always in brackets after the respective filter).

List of mineral sun creams without filters in the critical nano range:

List of mineral sun creams

Sunscreen for children: Please use mineral-based sunscreen!

Even if it smears and leaves a white film: Most mineral light protection filters are harmless and therefore the best choice for children. As a general rule, chemical filters should only be used on children from the age of two. A child's liver is not yet powerful enough to break down the chemical filters. So while mineral light protection filters are generally harmless, you should take a closer look at chemical filters.

Checklist: Quick Guide to Applying Lotion

  1. Make sure that the sunscreen is effective against both UV-A and UV-B rays.
     
  2. Apply sunscreen at least 30 minutes before sunbathing so that the sun protection filters in the sunscreen can be effective in the epidermis.
     
  3. Use more sunscreen than you might think.5 to 6 tablespoons for the whole body ( 30 to 40 milliliters)
     
  4. Reapply at least every 2 hours - also after bathing, as at least half of the sun protection is lost through the water (even with waterproof sunscreens!)
     
  5. Reapplying sunscreen does not extend its protective effect!
     
  6. Avoid the sun when it is at its strongest - i.e. two to three hours around its highest point. The sun is not always at its zenith at 12 noon. In summertime, midday shifts by one hour due to the time changeover, so the sun is at its highest point in the sky at 1 pm. The position of the sun also depends on where you are in Europe.

FAQ

At what UV index should I be especially careful?

From UVI 3: Sun protection recommended; from UVI 6: Take strong protective measures; from UVI 8: Avoid direct sunlight.

What is the difference between UVA and UVB?

UVB rays primarily cause sunburn and increase the risk of skin cancer; UVA rays penetrate deeper and accelerate skin aging. Both are harmful.

Mineral or chemical sunscreen—which is better?

For sensitive skin and children, usually mineral-based; for water-resistant sports use, often chemical or hybrid. Choose based on your skin type and activity.

How much sunscreen should I apply?

Guideline: Approx. 2 mg/cm² of skin → entire body ≈ 30–40 ml (5–6 tablespoons). Apply generously.

How often should I reapply sunscreen?

At least every 2 hours, and after swimming, heavy sweating, or drying off.

Is sunscreen alone enough?

No. Combine sunscreen with protective clothing, a hat, sunglasses, and shade, and plan your schedule accordingly (avoid the midday hours).

What SPF levels are recommended?

Guidelines: Children ≥ SPF 30; adults at least SPF 15–30; for high UV intensity (UVI ≥6), SPF 30–50+.

Are nanoparticles in sunscreen dangerous?

Studies are not conclusive. Nanoparticles must be labeled; if in doubt, it is better to choose non-nano products.

At what age can children start using chemical sunscreens?

Recommendation: Use chemical filters with caution; opt for mineral-based products. Chemical filters are generally recommended for children aged 2 and older, following medical or manufacturer recommendations.

Where can I find the current UV index?

On weather service websites (e.g., DWD), the Federal Office for Radiation Protection (BfS), and in many weather apps.For more information, visit and read the article "At what UV index should I avoid going out in the sun?"

Patrizia Lehmkuhl

Educational Consultant and Health Manager

 

Contact:

familienservice