When is UV highest today in Boulder, CO
UV Index
Very high
Today's UV index is very high. If working or spending time outdoors, wear UV protective clothing, use sunscreen, and try to avoid direct sun exposure between 11 AM and 4 PM.
TodayTomorrow
ExtremeVery highHighModerateLow
10AM
2PM
6PM
10PM
2AM
5AM
LowModerateHighVery high
Hourly UV and cloud cover
UV index is unitless. Cloud cover is shown as a percentage.
HourUV indexCloud cover
11AM0Low6%
12PM0Low6%
1PM1Low5%
2PM1Low6%
3PM2Low5%
4PM4Moderate5%
5PM6High6%
6PM8Very high10%
7PM9Very high17%
8PM9Very high28%
9PM10Very high42%
10PM8Very high53%
11PM6High59%
12AM3Moderate61%
1AM2Low61%
2AM1Low57%
3AM0Low54%
4AM0Low38%
5AM0Low27%