Alameda County, CA: Current UV Index and Hourly Forecast

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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.

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Current UV Index in Cities in Alameda County, CA

• Alameda - 7.6
• Albany - 7.6
• Ashland - 7.7
• Berkeley - 7.6
• Castro Valley - 7.7
• Cherryland - 7.7
• Dublin - 7.7
• Emeryville - 7.6
• Fairview - 7.7
• Fremont - 7.6
• Hayward - 7.7
• Livermore - 7.7
• Newark - 7.6
• Oakland - 7.6
• Piedmont - 7.6
• Pleasanton - 7.7
• San Leandro - 7.6
• San Lorenzo - 7.6
• Sunol - 7.6
• Union City - 7.6