Napa County, CA: Current UV Index and Hourly Forecast

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As of 3:08 PM PDT on April 7, 2026, all 11 cities in Napa County, CA in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Napa, CA with a reading of 5.7.

Over the next 24 hours, the highest UV Index reading in Napa County, CA is expected to be 7.4 in Yountville between 1:00 PM - 2:00 PM PDT tomorrow.

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Current UV Index in Cities in Napa County, CA

• American Canyon - 5.7
• Angwin - 5.7
• Calistoga - 5.7
• Deer Park - 5.7
• Moskowite Corner - 5.7
• Napa - 5.7
• Oakville - 5.7
• Rutherford - 5.7
• Silverado Resort - 5.7
• St. Helena - 5.7
• Yountville - 5.7