When is the UV index highest, and when should you tan?
A quick, honest guide to reading the UV index and timing your tan — plus a free tool that does it for your exact city.
The UV index measures the strength of the sun's ultraviolet radiation on a scale from 0 to 11+. It drives both how quickly you tan and how quickly you burn, and it changes through the day, peaking around solar noon. Knowing your local UV — and the best window to be in it — is the difference between an even glow and a burn.
What time of day is the UV index highest?
The UV index is highest in the middle of the day, generally between 10 a.m. and 4 p.m., and peaks around solar noon — roughly 12 p.m. to 2 p.m. depending on your time zone and the season. UV is stronger in summer and closer to the equator, and is highest when the sun is most directly overhead.
What UV index is best for tanning?
You can tan once the UV index reaches about 3 or higher. Many people tan in the UV 4–7 range, which gives meaningful exposure while keeping burn risk moderate. At UV 8 and above you tan faster but also burn faster, so keep sessions short and use sunscreen. HitUV calculates your best tanning window each day by balancing high UV against cloud cover.
Is it safe to tan when the UV index is high?
The higher the UV index, the faster skin can burn, and no amount of UV exposure is completely risk-free. If you do tan, the safer approach is to use broad-spectrum SPF, keep sessions short, stay hydrated, and avoid the most intense midday hours when the UV index is very high (8+). HitUV is an informational tool, not medical advice.
How do I know the best time to tan today?
Check today's peak UV and your best tanning window for your exact location. HitUV shows today's UV index, your ideal tanning window, peak sun, and the temperature during that window — then can send you a free alert about an hour before your window opens.
Does cloud cover affect the UV index and tanning?
Yes. Clouds reduce how much UV reaches the ground, but not entirely — you can still tan (and burn) on a hazy or partly cloudy day. HitUV factors cloud cover into its scoring so your recommended window reflects clear, high-UV hours rather than just the raw peak.
Get your city's UV and best tan time free
HitUV is a free web app that shows today's UV index, your best tanning window, peak sun, and a 7-day outlook for any city — and sends a free alert about an hour before your window opens. No account, no download required.
UV data by Open-Meteo. HitUV is an informational tool, not medical advice.