UV index in Denver, Colorado
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Loading today’s UV…
- Low 0 to 2
- Moderate 3 to 5
- High 6 to 7
- Very high 8 to 10
- Extreme 11+
Hour-by-hour numbers
| Time | UV index | Level |
|---|
The next few days
Each day’s UV curve and peak, drawn on the same scale so you can compare. The forecast reaches roughly four days ahead.
What to do today
How to read the UV index
The UV index runs from 0 upward. Sun protection is recommended once it reaches 3.
| Level | UV index | What to do |
|---|---|---|
| Low | 0 to 2 | Little risk for most people. Sunglasses on bright days. Take extra care on snow. |
| Moderate | 3 to 5 | Sun protection recommended: hat, sunglasses and sunscreen. Seek shade around midday. |
| High | 6 to 7 | Protection needed. Cut back on midday sun, cover up and use SPF 30+ sunscreen. |
| Very high | 8 to 10 | Extra protection needed. Unprotected skin can burn quickly. Avoid the midday sun. |
| Extreme | 11+ | Take every precaution. Unprotected skin can burn in minutes. |
UV for a day out
Check a game, city walk or beach visit. Compare the hours of the whole outing, not only your arrival.
Stadiums and sports venues · Browse all destinations by region
UV at famous landmarks
Hourly forecasts for sightseeing days, with practical notes for open squares, gardens and the journey between stops.
UV at popular hiking destinations
Live charts for well-known trails, with how elevation changes your sun exposure.
Guides
- Can You Get Sunburned in Winter?
Cold weather does not rule out sunburn. How snow, altitude and the local UV forecast affect winter outings.
- Can You Tan With a UV Index of 3?
You can tan at UV index 3, but it is already a sun-protection level. Learn what the number means and why it cannot give you a safe tanning time.
- Can You Get Sunburned at UV Index 2?
UV index 2 is low, but long exposure and sensitive skin still matter. Learn how to use a low UV forecast without treating it as a burn-proof guarantee.
- What Does a UV Index of 8 Mean?
UV index 8 is very high. See what that means for outdoor plans, how to read the hourly peak, and which protection to bring.
- Can You Get Sunburned Through a Window?
Ordinary glass blocks most UVB but can let UVA through. Learn what that means for a sunny window, a long drive and the outdoor UV forecast.
- Does Cloud Cover Reduce UV Exposure?
Clouds can reduce UV, but the amount varies. Learn why overcast skies are not a UV reading and how to use an hourly forecast on a changing day.
- What Time Does the UV Index Drop Below 3?
The time UV drops below 3 changes with place, season and weather. Find the afternoon drop using the local hourly curve and avoid a fixed-time rule.
- Does UV Index Affect Tanning Speed?
Higher UV means stronger sunburn-weighted radiation, but it cannot predict tanning speed. Learn why skin colour, burn risk and the UV index are different.
- What Is the UV Index? A Plain-English Guide to the Scale
The 0 to 11+ scale explained: what each level means, why 3 is the number to remember, and what changes the reading.
- What to Wear Hiking for Sun Protection: A Practical Guide
Clothing, hats, sunglasses and sunscreen for the trail, what UPF means, and the spots hikers forget.
- UV at Altitude, Snow and Clouds: Why You Burn Faster
Why the sun burns faster on a mountain, how snow and water reflect UV, and what clouds really do.
- When Is UV Strongest During the Day? Best Times to Hike
UV peaks near midday, not at the hottest hour. How to read the daily curve and time your hike around it.