When is UV highest today in St. Louis, MO
UV Index
High
Today's UV index is 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
8PM
9PM
10PM
11PM
12AM
1AM
2AM
3AM
4AM
LowModerateHigh
Hourly UV and cloud cover
UV index is unitless. Cloud cover is shown as a percentage.
HourUV indexCloud cover
9PM5Moderate81%
10PM4Moderate84%
11PM2Low84%
12AM1Low83%
1AM1Low82%
2AM0Low72%
3AM0Low69%
4AM0Low67%