Alameda County, CA: Current UV Index and Hourly Forecast

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As of 12:58 PM PDT on August 29, 2025, all 20 cities in Alameda County, CA in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Fremont, CA with a reading of 7.4.

Over the next 24 hours, the highest UV Index reading in Alameda County, CA is expected to be 8.2 in Fremont between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Alameda County, CA

• Alameda - 7.3
• Albany - 6.8
• Ashland - 7.4
• Berkeley - 7.3
• Castro Valley - 7.4
• Cherryland - 7.4
• Dublin - 7.4
• Emeryville - 7.3
• Fairview - 7.4
• Fremont - 7.4
• Hayward - 7.4
• Livermore - 7.4
• Newark - 7.4
• Oakland - 7.3
• Piedmont - 7.3
• Pleasanton - 7.4
• San Leandro - 7.3
• San Lorenzo - 7.3
• Sunol - 7.4
• Union City - 7.4