Sunburn map
        This service helps you avoid sunburn. Hourly UV index forecast

FAQ about the UV index

What’s the website about and what’s it for?

This service provides information on the intensity of ultraviolet solar radiation and its effect on your skin, wherever you are in the world. Spending long periods of time exposed to ultraviolet light can seriously harm your health.
The solar ultraviolet radiation level is different in different parts of the world. It depends on the season, time of day, cloudiness and ozone layer thickness. This website shows you the maximum and hourly UV index, maximum exposure time to avoid skin damage and protective measures you can take to reduce the adverse effects of radiation. The radiation level (shown by the UV index) is displayed for a three-day period.

What is the UV index?

The UV index also known as the Ultraviolet Index, is an international system of measuring ultraviolet solar radiation for a specific day and geographical location. The higher the index, the more intense and dangerous to your health the solar radiation is. On this website, you can view the maximum and hourly index. The UV index increases after sunrise and decreases towards the evening.

How is the maximum and hourly UV index displayed?

The map always shows the maximum UV index. When you select a city, the maximum UV index is shown by default, but you can switch this to hourly. When you do this, the site selects the nearest hour; e.g. at 9:45, 10:00 will be selected, and at 11:20, it will show the UV index for 11:00. The site takes into account local time and daylight saving time (if applicable) for the chosen city.

What range is the UV index displayed in?

On the three-day tabs (today, tomorrow and the day after tomorrow) you can see the UV index for each hour of daylight. The UV index is shown on a scale of 0 to 11. If the UV index is higher than 11, it’s displayed as 11 or 11+.

How does ultraviolet radiation affect health?

Ultraviolet radiation, in small doses, is good for your health: it helps the body produce Vitamin D.
But spending a lot of time in the sun can seriously harm your health. Sunburn may lead to skin cancer (deadly melanomas or carcinomas), premature aging of the skin (photo-ageing) and weakening of the immune system. Ultraviolet radiation may also have a damaging effect on the eyes: cataracts, retinal burn and serious visual impairment.

How can you reduce to risk of sunburn?

This service recommends a suitable sun protection factor (UVA + UVB) for the local UV index. The sunscreen’s protection factor is displayed with a safety margin. Using the (increase/decrease) arrows, you can see the maximum possible length of solar exposure without skin damage.
Sunscreen only takes effect 20 minutes after application. Its effect, on average, lasts 2 hours. It must be reapplied each time after swimming. It’s also important to remember that it’s not possible to apply sunscreen to every part of your body.
Clouds filter out ultraviolet radiation only partially.

What exacerbates or reduces the effects of ultraviolet radiation?

Water, sand and even snow reflect ultraviolet waves, therefore exacerbating the effect of UV radiation. In the mountains, the effect increases with altitude.
Shade and cloudiness reduce the effect of ultraviolet radiation, but don’t completely eliminate it. The following will help you reduce your exposure to ultraviolet radiation: shade, long-sleeved clothing, sunglasses, covering your head, not tanning at midday, applying sunscreen regularly (every 2 hours).

How is heat related to the ultraviolet radiation level?

Heat and UV radiation aren’t directly related. Heat is related to infrared waves, while tanning and sunburn are caused by ultraviolet radiation. This means that it can be very hot at the sauna, but you won’t tan; and it can be cool in the solarium, but you may easily get sunburned.

Why don’t sun protection factors on your website go above 30?

SPF 30 protects skin almost as effectively as SPF 40, 50 or 60. The difference is only a few percent, so the protective effect will be the same.

How to get full access?

To get full access, you need to register on the site via a social network of choice. To do this, tap on the social network’s button and agree to use it for registration. You will get access to all site features for one day after your first sign-in. Next time, use the same social network that you used for signing up initially.

Is this website mobile-friendly?

Yes, this service is mobile-friendly. It is recommended to use portrait mode of your device.

How to add a site to your smartphone’s home screen?

If you use Chrome on an Android phone, open the browser’s menu and select the “Add to the home screen” command. This will create an icon that will let you open the site just like any other app on your phone. If you use Safari, tap the Share button on the browser’s button menu, then tap the “Add to the home screen” button.

Which Web browsers and devices does the site support?

The website works correctly with the following Web browsers: Chrome, Safari, Firefox and Opera. Internet Explorer is not supported.

What restrictions are there on using the site?

The website can only be viewed in one browser tab. The service does not work on Internet Explorer. JavaScript should be enabled for the site to be fully functional. Do not use the “Back” button in your browser, as this will leave the website.

How does the UV index vary during the day?

The UV index increases from sunrise and reaches its peak at solar noon. Solar noon, however, doesn’t necessarily occur at 12 o’clock; it can be offset by up to two hours. After solar noon, the UV index decreases hour by hour.

How do you forecast the UV index?

Rapid climatic variations mean it’s impossible to make a long-term forecast. From summer, the UV index increases in the Northern Hemisphere and decreases in the Southern Hemisphere. The opposite happens in winter. The UV index can change significantly from year to year in the same geographical location, due to variations in ozone layer thickness.

How can I support this service?

The site needs your help to keep getting better. Please support us by purchasing full access. It would be nice if more people used the website. Please use the social networking buttons to let your friends know about

How accurate is the website’s data and how can it be used?

This site calculates the maximum sun exposure, based on maximum UV index and skin type. This is only for informational purposes. We are not responsible for any misinterpretation or misuse of the website content. You use this service at your own risk.

Busting myths about sunburns as part of skin cancer prevention

1. Myths about sunblock creams: using the cream outside and high SPF

If you apply the cream outside after leaving home, you leave your skin unprotected for 20 minutes – that’s how long it takes for the sunblock to start working.
SPF > 30 is pointless, since SPF30 already blocks 97-98% of radiation. That is, SPF60 does not double the protection factor (as is commonly believed) and does not extend the safe tanning time.

2. Myth about clouds: clouds protect you against sunburns

Dense clouds filter out just a fraction of ultraviolet radiation, while haze and cirrus clouds don’t block them at all and are the equivalent of a clear sky in terms of sunburn hazard. This is why it’s a good idea to protect your skin even in cloudy weather and check the UV index for the day in advance.

3. Myth about most dangerous hours: UV radiation is at max at noon

In most cases, the noon on your watch does not match the solar noon, and the offset can reach as much as 2 hours both ways. That is why it’s useful to know the hourly UV index and remember the most dangerous hours for being outside in the sun.

4. Myth about past burns: the burn is gone and skin cancer is not an issue anymore

Unfortunately, sunburns “sum up” and their consequences stay with your for the rest of your life. Carcinoma is directly related to the cumulative effect of solar radiation. Melanoma development is related to intermittent exposure to intense solar radiation. The risk of its development doubles after five serious sunburns received during a lifetime.

5. Myth about temperature and burns: no heat, no burn

Heat and burns are not directly connected. Heat is infrared radiation, while sunburns are caused by ultraviolet. You can easily get a burn in a cool tanning booth.
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Maximum UV Index
1 - 2 Low
3 - 5 Moderate
6 - 7 High
8 - 10 Very High
11+ Extreme