๐ค๏ธ Weather
UV Index Calculator
UV index depends overwhelmingly on how high the sun climbs, which is set by latitude and season, and then on cloud cover and altitude. Altitude matters more than people expect โ every thousand metres adds roughly ten per cent to the UV reaching your skin.
How it works
Latitude
Date
Sky conditions
Altitude
Hours from solar noon
UV index
Exposure category
Protection needed
Solar elevation at noon
Clear-sky UV index
Day of the year
Frequently asked questions
How do I use the UV Index Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.