Stanislaus County, CA: Current UV Index and Hourly Forecast

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As of 2:46 PM PDT on May 21, 2026, all 33 cities in Stanislaus County, CA in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Patterson, CA with a reading of 8.5.

Over the next 24 hours, the highest UV Index reading in Stanislaus County, CA is expected to be 8.7 in Patterson between 1:00 PM - 2:00 PM PDT tomorrow.

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Current UV Index in Cities in Stanislaus County, CA

• Airport - 8.3
• Bret Harte - 8.3
• Bystrom - 8.3
• Ceres - 8.3
• Cowan - 8.3
• Crows Landing - 8.3
• Del Rio - 8.3
• Denair - 8.3
• Diablo Grande - 8.5
• East Oakdale - 8.3
• Empire - 8.3
• Grayson - 8.5
• Hickman - 8.3
• Hughson - 8.3
• Keyes - 8.3
• Knights Ferry - 8.3
• La Grange - 8.3
• Modesto - 8.3
• Monterey Park Tract - 8.3
• Newman - 8.4
• Oakdale - 8.3
• Orange Blossom - 8.3
• Parklawn - 8.3
• Patterson - 8.5
• Riverbank - 8.3
• Riverdale Park - 8.3
• Rouse - 8.3
• Salida - 8.3
• Turlock - 8.3
• Valley Home - 8.3
• Waterford - 8.3
• West Modesto - 8.3
• Westley - 8.5