Contra Costa County, CA: Current UV Index and Hourly Forecast

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As of 9:02 AM PDT on August 31, 2026, all 50 cities in Contra Costa County, CA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Concord, CA with a reading of 1.5.

Over the next 24 hours, the highest UV Index reading in Contra Costa County, CA is expected to be 7.8 in San Ramon between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Contra Costa County, CA

• Acalanes Ridge - 1.5
• Alamo - 1.4
• Alhambra Valley - 1.3
• Antioch - 1.5
• Bay Point - 1.5
• Bethel Island - 1.5
• Blackhawk - 1.4
• Brentwood - 1.5
• Byron - 1.5
• Camino Tassajara - 1.4
• Castle Hill - 1.4
• Clayton - 1.5
• Clyde - 1.5
• Concord - 1.5
• Contra Costa Centre - 1.5
• Crockett - 1.3
• Danville - 1.4
• Diablo - 1.4
• Discovery Bay - 1.4
• East Richmond Heights - 1.3
• El Cerrito - 1.3
• Hercules - 1.3
• Kensington - 1.3
• Knightsen - 1.5
• Lafayette - 1.5
• Martinez - 1.5
• Montalvin Manor - 1.3
• Moraga - 1.4
• Norris Canyon - 1.4
• North Gate - 1.5
• North Richmond - 1.3
• Oakley - 1.5
• Orinda - 1.3
• Pacheco - 1.5
• Pinole - 1.3
• Pittsburg - 1.5
• Pleasant Hill - 1.5
• Port Costa - 1.3
• Reliez Valley - 1.5
• Richmond - 1.3
• Rodeo - 1.3
• Rollingwood - 1.3
• San Miguel - 1.5
• San Pablo - 1.3
• San Ramon - 1.4
• Saranap - 1.5
• Shell Ridge - 1.5
• Tara Hills - 1.3
• Vine Hill - 1.5
• Walnut Creek - 1.5