As of 1:14 PM PDT on April 21, 2025, all 20 cities in Alameda County, CA in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Hayward, CA with a reading of 7.7.
Over the next 24 hours, the highest UV Index reading in Alameda County, CA is expected to be 7.7 in Hayward between 1:00 PM - 2:00 PM PDT today.
Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
---|---|---|---|---|---|
Color | |||||
Risk | Low | Moderate | High | Very High | Extreme |