Live UV Index Today

Browse live UV by city

Start with a city page for route-specific UV context, hourly forecasts, monthly averages, and nearby city links.

• UV Index New York, NY
• UV Index Los Angeles, CA
• UV Index Phoenix, AZ
• UV Index Miami, FL
• UV Index Orlando, FL
• UV Index Denver, CO
• UV Index San Diego, CA
• UV Index Honolulu, HI

Use UV calculators

Estimate burn time, sunscreen need, reapplication timing, vitamin D exposure, and sunscreen amount from one tools hub.

• Sunburn Time Calculator
• Do I Need Sunscreen?
• All UV and sunscreen tools

Learn the UV scale

DermUV includes plain-English reference pages for UV levels, SPF, UVA, UVB, Fitzpatrick skin type, MED, and sun-damage warning signs.

• Interactive UV lessons
• UV glossary
• DermUV blog

What to do with this Live UV Index Today data

Sunscreen labels are tested at 2 mg/cm². Typical real-world application is closer to half that, so DermUV assumes about half the labelled SPF when it estimates protected time.

The UV index is a measure of erythemal (skin-reddening) irradiance, where each whole point equals 25 mW/m² of UV energy reaching the surface. That is why burn-time estimates fall roughly by half when the index doubles.

Cumulative dose drives photoaging and long-term skin damage more than any single day. Small daily exposures on commutes, walks, and driving add up across a season.

Reapplication matters more than the SPF number. Reapply roughly every two hours outdoors and immediately after swimming, heavy sweating, or towelling, regardless of what the bottle claims.

Cloud cover is not protection. Thin or broken cloud can still pass most incoming UV, and light cloud edges can briefly scatter more UV toward the ground than a clear sky.

UV scale reference

The WHO scale groups UV 1-2 as low, 3-5 as moderate, 6-7 as high, 8-10 as very high, and 11 or above as extreme. Protection is recommended from UV 3 upward, and shade during the middle of the day becomes the priority from UV 8 upward.

A practical routine at moderate-to-high UV is roughly one ounce of broad-spectrum sunscreen for full-body coverage, applied 15 minutes before going out, then reapplied on schedule. Clothing, hats, and shade carry the rest of the load, especially for children and anyone with a history of easy burning.

Keep exploring DermUV

These pages give more depth around live uv index today, from UV-scale reference material to calculators and city forecasts.

• Do I need sunscreen?
• DermUV articles
• Tan vs burn calculator
• Sunscreen amount calculator
• What UV index 10 means
• uv damage lesson
• What UV index 9 means
• reflection lesson
• FITZPATRICK definition

Numbers are modelled, not measured at your exact location, so treat them as guidance for planning rather than exact thresholds.