UV Index
UV Index
Today's UV index in San Ramon, United States 
will be up to 8.8, indicating a very high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-10
With a UV index of 8.8 in San Ramon, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
San Ramon has a UV index that varies throughout the year, with the highest levels in summer, often reaching strong to very strong levels around midday. In winter, the UV index is much lower, typically moderate.
The weather in San Ramon shows warm, dry summers and mild, wet winters. Summer temperatures often reach into the 80s and 90s Fahrenheit, while winter temperatures usually stay between the 40s and 60s. Rain mostly falls in winter and spring.
Compared to other parts of California and neighboring states, San Ramon's climate is milder and less extreme. It has fewer hot days than inland areas like Central Valley but more sun and warmth than coastal cities like San Francisco. Neighboring states like Nevada have colder winters.
See the UV index hour by hour for San Ramon, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.