UV Index Today in San Joaquin County, California (CA)
Sunday, September 20, 2026 -9:23 AM PDT (GMT-7)
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The average maximum UV Index today across 31 locations in San Joaquin County, California (CA), is 5.5. The highest projected maximum is 5.9 in Discovery Bay at 1:00 PM PDT, while the lowest projected maximum is 5.1 in Galt at 1:00 PM PDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 6.3. The highest projected maximum is 6.7 in Tracy at 1:00 PM PDT, and the lowest projected maximum is 6 in Linden at 2:00 PM PDT.
31 Places in San Joaquin County, California (CA)
Maximum UV Index Today