UV Index
UV Index
Today's UV index in Walnut Creek, 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: 2025-05-09
With a UV index of 8.8 in Walnut Creek, 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.
The UV index in Walnut Creek ranges from low to moderate, typically between 2 and 7 throughout the year, peaking in summer months. This means sun exposure varies but is often strongest from late spring to early fall.
Walnut Creek experiences 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 from November to March.
Compared to other parts of California, Walnut Creek has less extreme heat than inland areas and more sunshine than coastal cities like San Francisco. It is warmer and drier than northern states and has milder winters than many parts of the western United States.
See the UV index hour by hour for Walnut Creek, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.