Colorado, United States · 39.74, -104.99
Today's peak is extreme. Unprotected skin burns in about 13 min at the worst hour. Treat the sun as a hazard: stay indoors or fully covered.
About the UV index in Denver
Denver sits at 39.7° N, in the northern hemisphere. Today's UV peaks at 12.4: the "extreme" band, which uvlevel.net treats as extreme danger for unprotected skin at the worst hour.
Denver sees the widest UV swing of the year of any latitude band: a sharp summer peak around June and July, and a winter trough around December and January where midday UV can sit near zero for weeks at a time.
Altitude here
Denver sits about 1597 m above sea level. Thinner air scatters and absorbs less UV on the way down, so uvlevel.net adds roughly 13% to the modelled index here: uv = max(weather, CAMS) × (1 + 0.08 × metres/1000). That correction is already folded into every number on this page.
Hour by hour today
| Local time | UV index | Risk |
|---|---|---|
| 00:00 | 0 | No danger |
| 01:00 | 0 | No danger |
| 02:00 | 0 | No danger |
| 03:00 | 0 | No danger |
| 04:00 | 0 | No danger |
| 05:00 | 0 | No danger |
| 06:00 | 0 | No danger |
| 07:00 | 0.3 | No danger |
| 08:00 | 1.5 | No danger |
| 09:00 | 3.6 | Caution |
| 10:00 | 6.4 | Danger |
| 11:00 | 9.4 | Serious danger |
| 12:00 | 11.6 | Extreme danger |
| 13:00 | 12.4 | Extreme danger |
| 14:00 | 11.3 | Extreme danger |
| 15:00 | 9.1 | Serious danger |
| 16:00 | 7.5 | Danger |
| 17:00 | 5.7 | Caution |
| 18:00 | 3.6 | Caution |
| 19:00 | 1.6 | No danger |
| 20:00 | 0.4 | No danger |
| 21:00 | 0 | No danger |
| 22:00 | 0 | No danger |
| 23:00 | 0 | No danger |
| Skin type | Time to burn |
|---|---|
| I · always burns, never tans | 11 min |
| II · burns easily | 13 min |
| III · burns sometimes | 19 min |
| IV · rarely burns | 24 min |
| V · brown skin | 32 min |
| VI · deeply pigmented | 54 min |
Next 7 days · daily peak
Frequently asked
Is the UV index dangerous in Denver today?
Yes. UV in Denver is forecast to reach 3 or higher from 08:44 to 18:18 local time today, peaking at 12.4.
What time is UV highest in Denver?
UV is highest in Denver at around 13:00 local time today, reaching 12.4.
How long can unprotected skin stay out in Denver today?
At today's peak of 12.4, fair skin (Fitzpatrick type II) with no sunscreen burns in about 13 min. Darker skin types take longer. See the table above for every type.
Does the UV index in Denver change with the seasons?
Denver sees the widest UV swing of the year of any latitude band: a sharp summer peak around June and July, and a winter trough around December and January where midday UV can sit near zero for weeks at a time.
Nearby cities
Forecasts and elevation from Open-Meteo. The second UV opinion contains modified Copernicus Atmosphere Monitoring Service (CAMS) information; neither the European Commission nor ECMWF is responsible for how it is used here.
uvlevel.net gives general sun-safety guidance, not medical advice. Photosensitising medication, skin conditions, infants and a history of skin cancer all call for stricter limits than shown here.