UV index today in Hayward, CA
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
11AM
3PM
7PM
11PM
3AM
6AM
LowModerateHighVery high
Hourly UV and cloud cover
UV index is unitless. Cloud cover is shown as a percentage.
HourUV indexCloud cover
12PM0Low19%
1PM0Low22%
2PM0Low24%
3PM0Low22%
4PM2Low18%
5PM3Moderate10%
6PM5Moderate7%
7PM6High6%
8PM8Very high5%
9PM9Very high5%
10PM8Very high5%
11PM7High5%
12AM5Moderate4%
1AM4Moderate4%
2AM2Low5%
3AM1Low5%
4AM0Low5%
5AM0Low9%
6AM0Low15%