UV Index Today in Alameda County, California (CA)
Sunday, September 20, 2026 -9:23 AM PDT (GMT-7)
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The average maximum UV Index today across 29 locations in Alameda County, California (CA), is 5.3. The highest projected maximum is 6.6 in San Jose at 1:00 PM PDT, while the lowest projected maximum is 4.6 in Hayward at 1:00 PM PDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 6.6. The highest projected maximum is 6.8 in San Jose at 1:00 PM PDT, and the lowest projected maximum is 6.1 in San Francisco at 1:00 PM PDT.
29 Places in Alameda County, California (CA)
Maximum UV Index Today