Home
Weather London
WeatherRadar
RainfallRadar
TemperatureRadar
WindRadar
LightningRadar
Weather News
Editor's Pick
Discover the app
Weather widget
Contact us
Apps
Career
    Home / Editor's Pick /

    Understanding the UV-Index

07:00
10 March 2022

As the spring sun arrives...
Understanding the UV-Index

With spring here we will soon be spending more time outdoors as conditions brighten. But with sunnier days comes increased ultraviolet (UV) radiation.

UV radiation is a type of energy produced by the sun ray's and is the main cause of skin cancer.

Even on a cloudy day, UV levels can be high with UV able to be reflected and scattered in the clouds.

uv-skin

There are three types of UV rays: UVA, UVB, and UVC. UVC is the most dangerous form of UV radiation, but luckily this is absorbed by the atmosphere before it reaches Earth.

UVB penetrates the top layer of the skin and leads to sunburn.

UVA is the most potent source which we are exposed to all year long. UVA can even pass through windows and clouds and penetrates deep into our skin leading to ageing and increases our risk of skin cancer.

Because of the dangers associated with increased levels of UV, particularly in the spring and summer months when UV radiation is at its strongest, the UV Index was created.

The higher the UV Index, the stronger the strength of the UV and faster skin will burn.

Across the UK and Ireland, UV levels tend to reach 7 on the UV Index on the hottest days. At this level there is a risk of burning within 30-60 minutes.

As we spend more time outside, be sure to check the UV Index level near you through the local forecast!

Ryan Hathaway
More on the topic
50 years since historic 1976 heatwave. Three-month hot spell. . . Tuesday, 23 June 2026
Black-and-white photograph from the 1976 UK heatwave showing a crowded outdoor swimming area packed with people bathing, wading, and sitting along the water's edge during extreme summer heat.
Tuesday, 23 June 2026

Three-month hot spell

50 years since historic 1976 heatwave
How to sleep better in warmer weather. Tropical nights ahead. . . Tuesday, 23 June 2026
Person sitting on the floor indoors beside a running electric fan, cooling down in a sunlit room during hot weather, with sunlight streaming through a window.
Tuesday, 23 June 2026

Tropical nights ahead

How to sleep better in warmer weather
Schools closed and more heat disruption. Red warnings now live. . . Wednesday, 24 June 2026
Split image showing a person using a sun umbrella near the Elizabeth Tower in London on the left and a temperature map of England on the right with widespread red heat, temperatures reaching 35°C near London, and a large thermometer icon.
Wednesday, 24 June 2026

Red warnings now live

Schools closed and more heat disruption
All weather news
This might also interest you
Historic Storm Éowyn arrives. On this day.... . . Saturday, 24 January 2026
Split image showing a person in a yellow jacket struggling against strong winds and heavy rain on a street at night on the left, and an Irish wind forecast map on the right with red and purple shading, gusts up to 75 mph, and a wind warning icon, divided by a curved white line.
Saturday, 24 January 2026

On this day...

Historic Storm Éowyn arrives
Mixed conditions on an unsettled week. Your weather - Your shots. . . Sunday, 2 November 2025
plit image showing a double rainbow over a rocky shoreline on the left and sheep grazing in a green field under stormy clouds on the right.
Sunday, 2 November 2025

Your weather - Your shots

Mixed conditions on an unsettled week
Storm Benjamin impacts the UK. Warnings active. . . Wednesday, 22 October 2025
Split weather map showing UK wind speeds in orange-red shades up to 40 mph on the left and warning levels in green-yellow on the right, with a central wind warning sign.
Wednesday, 22 October 2025

Warnings active

Storm Benjamin impacts the UK
All articles
Weather & Radar

Weather & Radar is also available on

Google Play StoreApp Store

Company

Contact us Privacy Policy Legal info Accessibility statement

Services

Uploader

Socials

facebooktwittertikToklinkList